75results about How to "Reduce differential pressure resistance" patented technology

The invention discloses a waverider designing method based on a reference flow field of a revolution body of a cuspidal Von Karman curve. The method includes: patching a generatrix of a revolution body of a Von Karman curve to a generatrix of the revolution body of the cuspidal Von Karman curve; designing the revolution body of the cuspidal Von Karman curve; solving a supersonic-velocity axisymmetric reference flow field of the zero-incidence cuspidal Von Karman curve revolution body; performing streamline tracing in the supersonic-velocity axisymmetric reference flow field; and generating a waverider aerodynamic configuration. By adoption of the technical scheme of the method, the volume and the lift-drag ratio of a waverider are increased.

The invention discloses an adaptive continuously-adjustable cavitation device structure. The adaptive continuously-adjustable cavitation device structure comprises a benchmark chassis, a rotatable telescopic assembly and a drive mechanism assembly which are connected with one another, wherein the benchmark chassis and the rotatable telescopic assembly rotate under the power drive action of a servomotor, and the diameter of an outer edge formed by multiple layers of sector part groups in rotating is continuously adjustable along with rotation changes of the servo motor. In the variable speed sailing process of an underwater sailing body, the adaptive continuously-adjustable cavitation device structure provides power through the drive mechanism assembly to drive the multiple layers of sector part groups of the rotatable telescopic assembly to synchronously expand outward or contract inward, and adjusts the drive mechanism assembly according to change situation feedback of hydrokinetic parameters of an external flow field of the sailing body so as to realize adaptive change of the diameter of a cavitation device, thereby completing control for the size and the form of vacuoles, decreasing the wetting area of the underwater sailing body and reducing pressure difference resistance additionally caused to the utmost, greatly reducing frictional resistance and total resistance, and greatly improving the maximum speed and sailing distance of the sailing body.

The invention relates to the technical field of aerospace, and discloses an active control method and device for aerofoil drag reduction. A plurality of piezoelectric devices are uniformly arranged at the trailing edge of an aerofoil in advance, and when an aircraft takes off or flies at a low speed, the piezoelectric devices are controlled to dent so as to enable concave pits to be formed in the corresponding position of the aerofoil, so that the separation of the boundary layer is postponed and the pressure drag is reduced; when the aircraft flies at a high speed, the piezoelectric devices are controlled to be bulged so as to enable bumps to be formed in the corresponding position, so that the drag is reduced; or the piezoelectric devices are controlled to be in the periodic oscillation operating mode, so that the wake zone of the aerofoil is enabled to form a periodic vortex structure so as to control flow separation. The active control method and device for aerofoil drag reduction have the advantages that the aircraft is enabled to actively switch the corresponding drag reduction mode in different flight regimes, and the flight efficiency is improved.

The invention discloses a separable bow structure of a supercavitation underwater vehicle. The separable bow structure comprises a split type flow guide cover unit, a power-losing type electromagnet unit, a connecting rib ring and an underwater vehicle hull. The split type flow guide cover unit is composed of a flow guide cover upper portion, a flow guide cover lower portion and buoyancy foam, andthe buoyancy foam is fixed to an inner surface of the flow guide cover upper portion in a bonding mode. The power-losing electromagnet unit is composed of a ferromagnetic disc and a power-losing electromagnet. The ferromagnetic disc is fixed on an internal rib ring of the split type flow guide cover unit; the four ferromagnetic discs are evenly distributed in a circumferential direction, an included angle between the center of each ferromagnetic disc and a boundary between the upper portion of the flow guide cover and the lower portion of the flow guide cover is kept to be 45 degrees, circular grooves are evenly formed in the connecting rib ring in the circumferential direction, and power-losing type electromagnets are installed in the circular grooves; a connecting rib ring is in threaded connection with the underwater vehicle hull; and a power line channel is further formed in the circular grooves and used for connecting the power-losing type electromagnets with a power supply unitin the underwater vehicle hull through a power line.

The invention discloses a groove suction vane for a pump, which comprises a vane integrated with an impeller hub of the pump into a whole by fixation, and 1 to 3 grooves are arranged on the vane. Blocked fluid in a boundary layer is sucked by using the grooves, and a new boundary layer is also formed on the back of the grooves and can bear the counter pressure gradient of the fluid without separation. The sucking grooves designed and arranged according to the invention can radically eliminate the separation. As no separation zone exists, the pressure resistance can be greatly reduced. The groove suction vane realizes improving the performance of the pump in a larger operating range.

The invention discloses an air guide device and a method for reducing the air pressure drag through the air guide device. The device comprises a ventilation pipeline with the size and shape adjustable. The ventilation pipeline is provided with an air inlet and an air outlet. The method includes the steps that the ventilation pipeline is arranged tightly attached to the surface of a high-speed motion body, in the motion direction, the air inlet of the pipeline is located at the front end of the high-speed motion body, and the air outlet of the pipeline is located at the rear end of the high-speed motion body. Compared with the prior art, the device and method are suitable for an object, such as a high-railway train and a high-speed automobile moving in the air at a high speed, air of the windward face of the motion body is guided to the leeward face of a vehicle, so that the air pressure difference of the windward face and the leeward face of the motion body is reduced, the pressure drag is reduced, and the device and method have wide application prospects in the aspects of transportation, energy conservation and environment protection.

The invention relates to a drag reducing cover body installed on the tail of a coach body of a van or a container cargo truck, which is installed on the van or the container cargo truck for solving the problem that the drag of the tail of a coach cannot be reduced when a dome drag reducing device is installed above a cab of the van or the container cargo truck. The shape of the drag reducing cover body is a rectangular table; the wall thickness of the rectangular table type drag reducing cover body is 5mm to 10mm; an included angle between the inclined plane and the large end surface of the rectangular table type drag reducing cover body is 50 DEG to 80 DEG; the large end surface of the rectangular table type drag reducing cover body is abutted against the end surface of the tail of the coach body of the van or the container cargo truck; and the rectangular table type drag reducing cover body is connected with the end surface of the tail of the coach body of the van or the container cargo truck in a detachable mode. The drag reducing cover body is installed on the tail of the coach body of the van or the container cargo truck and is used for reducing the pressure drag of the van or the container cargo truck in running.

The invention discloses a vacuum pipeline ultra-high speed train comprising a vacuum pipeline, a train body, on-train suspension devices, a train-mounted propelling device, electrical equipment and a controlling system. The on-train suspension devices are parallelly mounted on the two edges, close to the outer side, of the bottom of the train body side by side to achieve train body suspension along with permanent magnetic railways laid on the inner bottom face of the vacuum pipeline. A superconducting magnet and a Dewar container are arranged in the middle of the bottom of the train body to propel the train along with a propelling coil laid on the inner bottom face of the vacuum pipeline. The diameter ratio of the train body to the vacuum pipe is 0.5-0.7, and the cross section area ratio of the train body to the vacuum pipe is 0.3-0.5. The electrical equipment supplies electricity to electric equipment inside the train body, the on-train suspension devices and train-mounted propelling device, and the control system controls the operation speed of the train body by controlling the magnitude of currents in the on-train suspension devices and train-mounted propelling device. By reasonably designing size parameters of the train body and the vacuum pipeline, the problems of air flow jamming, low passenger comfort and high energy consumption in the vacuum pipeline can be solved.

The invention discloses a centrifugal fan blade, a centrifugal fan and an air conditioning device, and relates to the technical field of air conditioners. The mainly adopted technical scheme lies in that the centrifugal fan blade comprises a front disc, a back disc and a plurality of fan blades, wherein an air inlet is formed in the front disc; an air outlet is formed between the back disc and the front disc; the plurality of blades are uniformly distributed between the front disc and the back disc; the shape of the front edges of the blades imitates the shape of the outer edges of bird wings; an air current enters the centrifugal fan blade through the air inlet, enters a runner through the front edges of the blades, and flows out of the air outlet through the back edges of the blades; the centrifugal fan comprises the centrifugal fan blade; and the air conditioning device comprises the centrifugal fan. The invention mainly aims to improve the working efficiency of the centrifugal fan blade, the centrifugal fan and the air conditioning device and reduce the noise and power consumption of the centrifugal fan blade, the centrifugal fan and the air conditioning device.

The invention belongs to the technical field of truck transportation, in particular to a van anti-overturning device and a control method thereof. The van anti-overturning device comprises a spoiler telescopic mechanism, the distance sensors, the pressure sensors and a controller, and the spoiler telescopic mechanism comprises a box body and the spoilers; the box body is fixedly connected with thetruck carriage body, a driving mechanism is arranged in the box body, and the spoilers are located at the two sides of the upper portion of the truck carriage body; the spoilers at the two sides aresymmetrically arranged, the section shapes of the spoilers are opposite to the section shapes of the wings up and down, and the driving mechanism drives the spoilers at the two sides to move away fromor close to each other in a horizontal direction; the distance sensors are arranged at the two sides of the truck carriage body, the pressure sensors are arranged at the two sides of the truck carriage body, and the controller is in signal connection with the driving mechanism, the distance sensors, the pressure sensors and a speed measuring mechanism of the truck.

The invention designs a direction-finding antenna cover with a balance beam appearance, and belongs to the overall aerodynamic appearance design field. Due to relatively large appearance dimension ofan added antenna, a design method of mixing front and back rectifying regions with a transitional streamline of the antenna cover appearance in the layout design of the antenna cover is adopted, so that separation occurring when air flow flows through the antenna cover can be lowered, and air-flow flow field can be improved; through comparison and analysis on low-speed aerodynamic characteristics,flow field characteristics and a vorticity graph, the optimal scheme is determined; and under the premise of satisfying the use requirement of a task system, the appearance dimension of the antenna cover is reduced as far as possible, so as to reduce influence to the aerodynamic characteristics of an aerial carrier from the added antenna cover; the antenna cover adopts multiple items of overall aerodynamic comprehensive optimization design measures of a variable parameter control contour line, CFD calculation, a wind tunnel test and the like, so that the appearance dimension of the antenna cover is optimized to the largest extent; the problems of small internal space, inconvenience in waterproof and rain leakage prevention design of the existing antenna cover with the balance beam appearance are solved; and the novel direction-finding antenna cover optional scheme with the balance beam appearance is provided.

The invention provides an air guiding device applied to a van trailer. The air guiding device comprises a tail door guiding device installed on a rear compartment door of the van trailer. The tail door guiding device comprises a guiding device body I and a guiding device body II. An included angle is formed between the upper end face of the guiding device body I and the top face of the van trailer. An included angle is formed between the outer side face of the guiding device body II and the side face of the van trailer. The air guiding device further comprises rear lower side guiding devices,side face guiding devices and front lower portion guiding devices, all of which are installed on the lower side of a compartment of the van trailer. The rear lower side guiding devices are symmetrically arranged on the left side and the right side of the rear portion of a trailer frame of the van trailer, the side face guiding devices are symmetrically arranged on the left side and the right sideof the middle portion of the trailer frame of the van trailer, and the front lower portion guiding devices are symmetrically arranged on the left side and the right side of the front portion of the trailer frame of the van trailer. The air guiding device is reasonable in design, surrounding air flows of the van trailer can be orientated and guided in sequence, the possibility that turbulence cyclones and flow separation are generated around the van trailer through the air flows is reduced, air resistance is reduced, and the air guiding device is low in carbon, environment-friendly and worthy of popularization.

The invention discloses a micro-blowing structure and method for resistance reducing and lift increasing of a supercritical airfoil and belongs to the technical field of aircraft design. Skins with micro holes are arranged near the rear edge of the lower airfoil surface of the airfoil, micro-blowing is started under the cruising state, the wall face friction resistance in the micro-blowing actingarea is reduced remarkably, and the pressure difference resistance of the airfoil is further reduced through increasing of the pressure intensity in a micro-blowing upstream part, so that the total resistance of the airfoil is reduced; meanwhile, the lift of the airfoil can be increased through pressure intensity increasing caused by micro-blowing of the lower airfoil surface; and finally, the resistance reducing and lift increasing effects can be achieved simultaneously. The micro-blowing technique can be used in wide flowing fields including low-speed airliners, high subsonic speed airlinersand even supersonic aircrafts, and rapid development of manufacturing techniques in recent years provides a guarantee for application of the micro-blowing technique.

The invention discloses a wet process flue gas desulfurization water drop-shaped grout spraying pipe, comprising a grout main pipe and branch pipes connected with the grout main pipe. The wet process flue gas desulfurization water drop-shaped grout spraying pipe is characterized in that the section of the grout main pipe is water drop-shaped; the sections of the branch pipes are round; the branch pipes connected to the grout main pipe at the same height form a vein-shaped single-layer grout pipe network; the grout main pipe is a hollow shell, is straight and flat in unfolding direction and is the same as the adsorption tower of a desulfurization system in diameter. Compared with the traditional grout main pipe with the round section, especially under the condition that the pipe diameter is larger, the grout pipe can better adapt to and fit with a smoke flowing field due to the reasonable water drop-shaped streamline section design, a vortex region can be reduced, the differential pressure resistance can be reduced, the smoke flow uniformity can be improved, and further the desulfurization efficiency and the operational reliability of the whole system can be improved.

The invention discloses a swarm unmanned aerial vehicle aerodynamic layout capable of achieving tandem combined flight, which not only can realize tandem combined flight in the air, but also can be automatically split in the air to form an unmanned aerial vehicle swarm. The tandem combined flight can reduce a differential pressure resistance generated when the single unmanned aerial vehicle flies;a beneficial pneumatic influence of tandem wings can be effectively utilized through reasonably arranged tandem wing layout, and aerodynamic efficiency of the unmanned aerial vehicle is improved so that the voyage of the unmanned aerial vehicle in a combined flight state is prolonged relative to a single flight state, a combat radius of the swarm unmanned aerial vehicle is improved, and a motherunmanned aerial vehicle is far away from a first-line battlefield; the combined unmanned aerial vehicle can release a large number of unmanned aerial vehicles through a small number of ejection times,and operation time of the mother unmanned aerial vehicle in a dangerous airspace is shortened; the combined flight state is beneficial to spoofing an enemy air defense radar; and the pressure of an enemy air defense system can be increased instantly by releasing a flight state of a combined single body so that the position of the enemy air defense system is exposed, and the enemy air defense system can be eliminated.

The invention relates to a bionic coupling blade of an aerogenerator, which belongs to the field of wind power equipment. The invention is a bionic coupling blade structure of the aerogenerator, namely airfoil profiles (configurations) are coupled with a blade structure. Through the research on arrangement modes of wing feathers of wings of typical birds (long-eared owl and the like), based on a biological function coupling principle, the airfoil profiles are sequentially arranged to form the surface of a bionic coupling structure at the spanwise front edge of a blade to ensure that the blade has the characteristics of high lift and low resistance. The form of the spanwise front edge of the blade can be limited by three values, namely wave crest, wave trough and wavelength; the distance from the wave trough to a trail edge is set as a basic chord length C of the airfoil profiles; the distance from the wave crest to the trail edge is 1.025 to 1.20 times of the basic chord C of the airfoil profiles; and the distance wavelength I from the wave trough to the wave trough (the wave crest to the wave crest) is 0.25 to 1 time of the basic chord C of the airfoil profiles. The invention aims to reduce the vortex produced on the surface of the blade, improve the work efficiency of the blade, and effectively reduce the noise of the blade structure.

The invention provides a grid rudder and an aircraft. The grid rudder comprises a plurality of partition plates which are connected with each other and form a grid structure; wherein each partition plate is oppositely provided with a windward side and a leeward side along the two ends of the intersection line of the partition plates, at least one part of the windward side is provided with a notch,and the absolute value of the tangent slope of the outer surface where the notch is located is continuously reduced along the direction from the windward side to the leeward side, a flow guide curvedsurface is formed at the windward side, square arrangement at the windward side is avoided, and under hypersonic speed environment, on one hand, differential pressure resistance and friction resistance are reduced, power efficiency is improved, the total heat generated by heating of the windward side is reduced, and the structural strength of materials of the grid structure is guaranteed; on theother hand, the condition of local high heat generated by protruding parts such as edges and corners under the condition of airflow friction is improved, the aerodynamic heat of the grid structure isreduced, the thermal environment distribution of the grid structure is improved, and the temperature distribution uniformity is improved, so that the structural thermal stress is reduced, and the strength performance is optimized.

The invention provides an adjustable dry hanging structure for a large-size vitrified tile on he wall surface. The adjustable dry hanging structure comprises a torque adjusting mechanism, a connectingpiece and a dry hanging piece; the torque adjusting mechanism comprises an installation base, a spiral torque adjusting rod and a sliding base, the installation base is fixedly installed on the baselayer wall surface, the spiral torque adjusting rod is rotatably installed on the installation base, and the spiral torque adjusting rod is perpendicular to the base layer wall surface; the sliding base is arranged on the spiral torque adjusting rod in a sleeving mode, the connecting piece is fixedly installed on the sliding base, the dry hanging piece is fixedly installed on the vitrified tile through an expansion bolt, and the dry hanging piece is buckled on the connecting piece. The invention further provides an installation method of the adjustable dry hanging structure for the large-sizevitrified tile on the wall surface. Compared with the prior art, the installation position of the vitrified tile can be adjusted, field installation is convenient and fast, the construction difficultyis reduced, and the construction period is shortened.

The invention relates to the technical field of a piezoelectric pump, and discloses a valveless piezoelectric pump. The valveless piezoelectric pump comprises a pump body, a piezoelectric vibrator anda flow pipe, wherein a chamber is formed in the pump body, and the piezoelectric vibrator is arranged in the chamber to form a pump chamber; the flow pipe is arranged on the pump body, and a flow channel communicating with the pump chamber is formed in the flow pipe; the flow channel is a rotating body cavity formed by using a curve as a bus, and the curve comprises a hyperbolic segment and a circular arc segment which are in the form of smooth transition; the center of the circular arc segment is positioned outside the flow channel, and the curvature of the hyperbolic segment is less than that of the circular arc segment; and the diameter of the flow channel decreases first and then increases. When a fluid flows through the flow channel, the speed can always increase first and then decrease, so that the pressure differential resistance of the fluid is reduced, and the flow speed is increased and the generation of vortex is minimized at the same time. Thus, the internal flow field ofthe valveless piezoelectric pump reaches a critical state, which is compatible with the two performances of large flow and low vortex. In addition, the structural stability of hyperbola is better.

The invention relates to a bionic double-turbine hydraulic torque converter which comprises a pump wheel, a pump wheel outer ring, a pump wheel inner ring, a first turbine, a guide wheel and a second turbine. Blades of the guide wheel are bionic blades; a momentum distribution function polynomial of the blades is y=ax<3>+bx<2>+cx+d, the x is horizontal coordinates of equal division points on a mean camber line, and the y is a corresponding momentum distribution value; and the a is larger than or equal to 0.6044 and smaller than or equal to 1.4151, the b is larger than or equal to -0.5792 and smaller than or equal to -0.1698, the c is larger than or equal to -0.1989 and smaller than or equal to 0.581, and the d is larger than or equal to -0.4221 and smaller than or equal to 0.3746. Due to the fact that the blades of the guide wheel are bionic blades, the starting torque ratio and the efficiency of the bionic double-turbine hydraulic torque converter are improved compared with an original double-turbine hydraulic torque converter. Furthermore, the capacity coefficient of the pump wheel is larger than that of a hydraulic torque converter using general blades.

The invention discloses an angle-adjustable energy-saving manger board comprising a lower wall board fixedly arranged on a deck, and an upper wall board hinged to the upper end of the lower wall board; a first reinforcing girder is fixedly arranged on the rear end face of the lower wall plate, and a second reinforcing girder is fixedly arranged on the rear end face of the upper wall plate. The angle-adjustable energy-saving manger board further comprises a telescopic mechanism capable of enabling the upper wall board to rotate around the top of the lower wall board, and the two ends of the telescopic mechanism are hinged to the rear end face of the lower wall board and the second reinforcing girder correspondingly. Transverse reinforcing ribs are fixedly arranged on the rear end face of the upper wall plate and the rear end face of the lower wall plate, and a transversely-distributed top plate is fixedly arranged at the top of the upper wall plate. The upper end of the second reinforcing girder is fixedly connected to the top plate. Air resistance can be reduced, and energy consumption of the ship is saved.

The invention provides an active flow controller for suppressing vortex-induced vibration based on deep reinforcement learning and a control method. According to the active flow controller disclosed by the invention, a deep reinforcement learning decision-making agent is established based on a Soft Actor-Critic algorithm, and a robust real-time control strategy is output through continuous interaction with a flow environment. A reward and punishment function related to a vortex-induced vibration state in a cylinder transverse flow direction and cylinder surface resistance is established, an artificial neural network weight in a decision-making agent is dynamically learned and adjusted, and a mapping relation from flow states such as flow environment speed and pressure to control actions is established, so that the active flow controller is obtained. The active flow controller is used for controlling the air suction and blowing devices symmetrically installed on a cross flow pole of a cylinder, and the two control targets of vibration suppression and resistance reduction of the cylinder can be achieved.

The invention discloses a hollow-out SUV rear spoiler that can reduce drag and lift. A rectangular hole is opened in the middle of the rear spoiler to allow airflow to flow directly through the rectangular hole, thereby reducing the low pressure behind the rear window of the vehicle. zone, reducing the pressure differential resistance encountered by the vehicle during driving. At the same time, the cross-section of the spoiler behind the rectangular hole is designed as an inverted airfoil to compensate for the downforce loss caused by the opening, so as to ensure that the pressure difference resistance is reduced while not affecting the rise of the rear spoiler on the vehicle. The counteracting effect that the force should have.

The invention relates to a bionic double-turbine hydraulic torque converter. The bionic double-turbine hydraulic torque converter comprises a pump wheel, a pump wheel outer ring, a pump wheel inner ring, a first turbine, a guide wheel and a second turbine. Vanes of the pump wheel are bionic wheels. The polynomial of the circular rector distribution function of the pump wheel is y=ax3+bx2+cx+d, wherein x is the transverse coordinate of each equal diversion point on an arc line, y is the corresponding circular rector distribution value, -1.4827<=a<=-0.7116, -1.7632<=b<=-0.8364, 0.0377<=c<=1.1008, and -0.3767<=d<=0.3645. The vanes of the pump wheel are bionic wheels. Compared with a traditional common double-turbine hydraulic torque converter, the starting torque ratio and efficiency are increased, and the capacity factor of the pump wheel is larger than that of a hydraulic torque converter with common vanes.

The invention relates to a method for reducing the ship resistance by using the atmospheric pressure, which is characterized in that the outside waterline part of a ship hull is provided with a water-air isolation belt of which the bottom is immersed into water. When the ship moves on the water surface, vacuum zones (or negative pressure zones) are generated on both sides of the stern and the ship hull; because of the water-air isolation belt which is arranged on the outer side of the ship hull and is immersed into the water, air cannot enter the vacuum zones under the water-air isolation belt, and water flow quickly fills up the vacuum zones below the water-air isolation belt so as to greatly reduce the descending extent of water levels on both sides of the stern and the ship hull and reduce the ship resistance.

The bionic dynamic variable-structure skin comprises a front section and a rear section, each of the front section and the rear section is formed by compositing a top layer, a middle layer and a bottom layer, the top layers of the front section and the rear section are flexible organic polymer films, the bottom layers of the front section and the rear section are ceramic heating pieces, and the ceramic heating pieces are arranged in the middle of the front section and the rear section. The middle layer of the front section is made of a temperature-control phase-change material, the middle layer of the rear section is a metal flat plate, a plurality of rhombic holes are formed in the metal flat plate, and the rhombic holes are filled with the temperature-control phase-change material. The heat production amount can be controlled by adjusting the bottom layer ceramic heating sheet, so that the temperature control phase change material deforms to a corresponding degree, the process that wrinkles of the dolphin skin and body thorns of the dolphin skin change along with the change of the speed of external water flow is simulated, the viscosity of water flow on the surface of the skin can be reduced through redundant heat, and the skin quality is improved. And finally, the skin has a self-adaptive resistance reduction function.

The invention discloses a device and a method for converting reciprocating motion into continuous rotation and application, and the device comprises a central shaft and a rotating disc, the rotating disc is connected with the central shaft through a bearing, and the rotating disc and the bearing are concentrically arranged; fins are arranged on the circumference of the rotating disc, and the upperwing surfaces of the fins are of convex structures. According to the device for converting the reciprocating motion into the continuous rotation, by means of the wing-shaped structures of the fins inthe device and the limited installation angles of the fins, the rotation direction of the fins can be kept unchanged all the time in the reciprocating motion process of the device, and therefore thelift force in the continuous constant direction can be obtained. The device is reasonable in design, simple in structure, easy to operate, easy to control, high in efficiency, safe, reliable and capable of providing continuous lifting force for an aircraft or providing continuous thrust for ship navigation.

The invention discloses a throat offset type pneumatic thrust vectoring nozzle with orifice jet. At least one jet orifice is arranged in each of the upper portion and the lower portion of a front convergence section of a second throat, and the jet orifices are communicated with a concave cavity and an external recirculating zone and are symmetrical along the central section of a nozzle body. The concave cavity and the external recirculating zone are communicated through the jet orifices, self-adaptive orifice jet is formed through the pressure difference between the inner recirculating zone and the outer recirculating zone of the concave cavity, the orifice jet can effectively compensate the pressure of the low-pressure recirculating zone and reduce the pressure difference resistance of the outer wall face of the nozzle, the orifices can generate certain thrust, and the thrust coefficient of the nozzle is improved.

The invention relates to a coupling bionic double-turbine hydraulic torque converter. The coupling bionic double-turbine hydraulic torque converter comprises a pump wheel, a pump wheel outer ring, a pump wheel inner ring, a first turbine, a guide wheel and a second turbine. Vanes of the pump wheel are bionic wheels. The polynomial of the circular rector distribution function of the pump wheel is y=ax4+bx3+cx2+dx+e, wherein x is the transverse coordinate of each equal diversion point on an arc line, y is the corresponding circular rector distribution value, 3.0619<=a<=6.0894, -6.0787<=b<=-3.8151, -0.406<=c<=0.0147, -0.1814<=d<=0.4725, and 0.5972<=e<=1.5149. The vanes of the pump wheel are bionic wheels. Compared with a traditional common double-turbine hydraulic torque converter, the starting torque ratio and efficiency are increased, and the capacity factor of the pump wheel is larger than that of a hydraulic torque converter with common vanes.