92results about How to "Improve flow conditions" patented technology

A propulsive system for an aircraft including an auxiliary jet engine is integrated within a tail cone of a fuselage. Lateral air intakes include each one a scoop movable between a closed position and an opened position are associated with aerodynamic channels to supply with air the auxiliary jet engine. The aerodynamic channels meet at a common channel including a movable flap to balance air flows coming from the air intakes when the operation is not symmetrical.

A charging device for a fuel cell includes a turbine having a housing part with a receiving chamber in which a turbine wheel of the turbine is received so as to be rotatable relative to the housing part about an axis of rotation. The turbine wheel includes impeller vanes via which a medium, in particular a gaseous waste gas of the fuel cell, can flow against the turbine wheel in an inlet region, and which are curved forwards at least in the inlet region.

The invention relates to a method for preventing sand in oil natural gas well, and the formula of relative processing agent, wherein the invention uses fiber to form three-dimension mesh structure, to control the process of discharging sand from storage layer and the formula of processing agent. The invention is characterized in that: first using crack machine and ground tube to extrude pretreatment liquid into storage layer; then using salt water clean liquid to crack; then using fiber composite to process main crack; extruding and completing sand prevention. The invention can eliminate the damage on former oil well storage layer, to improve the leakage condition; and the well eye is filled with fiber composite ring around; the invention can improve yield, realize non-screen sand prevention, and save cost.

The invention relates to a method for rectifying trichlorosilane, and belongs to the technical field of trichlorosilane rectification and purification. The method comprises the following steps of: feeding trichlorosilane-containing crude synthesis liquid into a preparation tower and rectifying to separate and remove most light impurity components from a raw material; discharging the liquid subjected to impurity removal by the preparation tower from a tower bottom, and feeding into a trichlorosilane rectifying tower to obtain a trichlorosilane product at a tower top; and feeding the material in a tower kettle into a silicon tetrachloride rectifying tower, and evaporating a silicon tetrachloride product on the top of the silicon tetrachloride rectifying tower. By the method, energy can be saved by 60 percent, and an energy-saving effect is obvious; and by a continuous rectification technology, yield is greatly improved while the energy is saved.

The invention discloses a variable geometry outlet guide vane, the outlet guide vane includes an inlet adjustable section, an outlet fixed section, and there is a gap between the trailing edge of the inlet adjustable section and the front edge of the outlet fixed section; the gap is formed by Composed of two smooth curves, the pressure surface and the suction surface are connected through the gap. Using the pressure difference between the pressure surface and the suction surface, a small part of the air flows through the gap from the concave surface to the convex surface, so as to blow the boundary layer and reduce the loss. Increase the airflow turning angle. The variable geometry outlet guide vane of the compressor proposed by the present invention, by adjusting the position of the front part of the outlet guide vane, avoids flow separation or blockage due to the excessive The rear part of the guide vane remains stationary, and the rotation of the guide vane has little effect on the flow of the exhaust diffuser and the combustion chamber.

The invention discloses a vane regulation control device. The vane regulation control device comprises a variable geometric outlet vane and a corresponding data acquisition and processing system, wherein the outlet vane comprises an inlet adjustable section and an outlet fixed section, and a clearance is arranged between the tail edge of the inlet adjustable section and the front edge of the outlet fixed section; and the clearance consists of two sections of smooth curved lines, and a pressure surface communicates with a force absorption surface through the clearance. By utilizing pressure difference between the pressure surface and the force absorption surface, a small part of air is led into a convex surface from a concave surface through a seam so as to blow a boundary layer thin. Losses are reduced, and airflow turning angle is increased. According to the vane regulation control device provided by the invention, a regulation command is sent out by the data acquisition and processing system, the mounting angle of the front part of the outlet vane is adjusted in a stepping manner, and flow separation or blockage caused by too-large attach angle of a vane inlet when the vane runs under variable work conditions is avoided; and at the same time, as the rear of the vane is kept still, the rotating of the vane produces little influence on the flow of an exhaust diffusion section and a combustion chamber.

The invention belongs to the technical field of automobile aerodynamics, and particularly relates to an automobile drag coefficient optimization design method, which comprises the following steps of: based on flow optimization design, determining mutual interference parameters of front and back flows and overall data of an automobile, and establishing a corresponding automobile model; according to the determined automobile wind resistance data, an automobile head, a flat floor, an upper automobile body part, an automobile tail and a cooling system are improved, and corresponding models are established; based on design elements in multiple aspects, the wind resistance coefficient of the automobile is comprehensively optimized, and the error between the design and the actual wind resistance test is determined through stress analysis of the model; according to the corresponding errors, the vehicle head, the flat floor, the upper vehicle body part, the vehicle tail and the cooling system are corrected. According to the method, multi-factor condition analysis is carried out, and the factors influencing the automobile wind resistance parameters are analyzed, so that the automobile machine changing scheme is systematically determined. Each step in the modification scheme is refined, the modification strategy of each part is summarized through a large number of experiments, and wind resistance parameter optimization is improved.

The invention relates to a diaphragm pump having a delivery space, which encloses a working volume, at least one deflectable diaphragm, which can be moved into a suction position and a pump position, an inlet valve arranged on a suction side of the diaphragm pump and an outlet valve arranged on the pressure side of the diaphragm pump. In order to make it possible to deliver fine-grain powder, for example, non-flowable powders having particle sizes of 0.01 μm to 100 μm, using a diaphragm pump, it is proposed that a gas feed for introducing a gas into the delivery space be arranged at the delivery space. In addition, the invention relates to a method for delivering fine-grain powder.

Combustion cylinder (10) of an internal combustion engine, having a combustion chamber wall (20), which surrounds a combustion chamber (30), and a combustion chamber cover (40), which closes off the combustion chamber (30) on the upper side, wherein at least one inlet valve (50) for letting in a fluid is arranged on an inlet side (42) in the combustion chamber cover (40), and at least one outlet valve (60) for letting out a fluid is arranged on an outlet side (44) in the combustion chamber cover (40), wherein, furthermore, a prechamber spark plug (70) is arranged between the at least one inlet valve (50) and the at least one outlet valve (60) in the combustion chamber cover (40), which prechamber spark plug is arranged between the at least one inlet valve (50) and an injector (80) for injecting combustion fluid.

The invention discloses a spiral groove shell used for improving the cavitation performance of an inducer. The spiral groove shell comprises an upstream pipeline, a pump shell, a sleeve, spiral grooves and the inducer. The spiral grooves are installed at an inlet of the inducer, and the turning direction of the spiral grooves is opposite to that of the inducer. The sleeve is used for fixing the positions of the spiral grooves. When the inducer works, backflow of blade tip clearances is enhanced due to the existence of the spiral grooves, and the spiral grooves work on fluid at the same time, so that life of the inducer remains unchanged or is increased slightly.

The invention relates to a surge-preventing structure for an aero-engine compressor. A stator ring is mounted inside a compressor case, uniformly and peripherally distributed stator vanes are arranged on the stator ring, a compressor rotor is positioned inside the compressor case 1 and is provided with rotor vanes, a radial vent hole is reserved between each two stator vanes and at the peripheral position of the stator vanes on the stator ring, and vent holes with the diameter larger than that of each radial vent hole are reserved at the corresponding positions on an intermediate case and the compressor case. Speed loss and surge due to overlarge attack angles are eliminated; and flow condition is improved, thereby surge can be prevented effectively. The surge-preventing structure has the advantages that compressor characteristics can be improved, stable working range can be widened, and the surge-preventing structure can be used for preventing 'front-surge and rear-vortex' type surges and is convenient to process, low in size required accuracy, simple, low in cost and reduced in gas loss.

A multiphase pump includes a housing having a pump inlet and a pump outlet for a process fluid, an inlet annulus configured to receive the process fluid from the pump inlet, a discharge annulus configured to discharge the process fluid into the pump outlet, a pump rotor configured to rotate about an axial direction and arranged within the housing, the pump rotor being configured to convey the process fluid from the inlet annulus to the outlet annulus, and a return line configured to return the process fluid from the high pressure side to the low pressure side, the return line including an inlet configured to receive the process fluid, an outlet configured to discharge the process fluid and a control valve configured to open and close the return line, the inlet of the return line arranged directly at the discharge annulus.

The invention belongs to the technical field of the process for treatment in water supply and drainage, particularly the treatment of sediment in water supply and drainage projects, more particularly a netted rope-combing sedimentation tank comprising a sedimentation tank, wherein flow-homogenizing netted ropes are arranged on the cross-section of the water inlet at the front end of the sedimentation tank; N ways of front netted ropes are arranged behind the flow-homogenizing netted ropes at the front end of the sedimentation tank; pyramidal collecting hoppers are respectively arranged at the bottom of the sedimentation tank between the flow-homogenizing netted ropes and a first layer of front netted ropes and between two adjacent layers of front netted ropes, and discharging pipes are mounted at the bottom of the pyramidal collecting hoppers; and the sedimentation tank is generally provided with four layers of front netted ropes, and 1 to 2 layers of middle netted ropes are arranged on the cross-section of the middle part of the sedimentation tank. By substituting the flow-homogenizing netted ropes for a water-inlet perforated wall at the front end of the sedimentation, the invention can reduce the construction cost by 10% and reduce the energy consumption by 30%; by adding the front netted ropes to the sedimentation area at the front part of the sedimentation tank, the invention can increase the capacity utilization coefficient of the sedimentation tank by more than 10%; and by adding the middle netted ropes to the middle part of the sedimentation tank, the invention can effectively prevent the sedimentation tank from being affected by turbulent burst and other natural factors and improve the operating efficiency of the sedimentation tank.