39results about How to "Reduced shape resistance" patented technology

This application describes garments (2), for example swim suits or other sports or athletic garments, in which a plurality of panels (10-22&30-44) are laminated on the outer surface of a base layer (4) of stretchable elasticated fabric to offer (in the case of a swim suit) improved performance for competitive swimmers through a reduction in surface drag, a reduction in form drag and / or improved stability in the water.

The invention discloses an elliptical tube H-shaped fin heat exchanger for waste heat recovery. The elliptical tube H-shaped fin heat exchanger comprises an elliptical heat exchange tube, a plurality of groups of H-shaped fins and a heat exchanger surface, wherein the H-shaped fins are sleeved on the surface of the heat exchange tube; the heat exchanger surface consists of non-uniform triangular small wings, which are elliptically arranged, on the surfaces of the H-shaped fins around the elliptical heat exchange tube. When dusty flue gas flows through the surfaces of the H-shaped fins, the small wings disturb the fluid to enhance the heat exchange on the tube wall and the downstream side, and meanwhile, the deposition of particles on the tube wall is reduced; the pressure drop can be reduced by the elliptical tube while the particle adhesion is reduced. A plurality of longitudinal vortexes are arranged in a non-uniform manner; at the front and rear edges of the wing, the size of the small wings and the windward attack angle are larger; on the middle parts of the H-shaped fins, the size of the small wings and the attack angle are smaller; by using the device, the heat exchange surface in different flow states can be enhanced respectively, the heat exchange of the fins are effectively enhanced, the pressure drop is reduced, and the deposition of dust particles in the flue gas on the heat exchange surface is reduced, so that the heat exchanger can operate efficiently for a long time in the dusty flue gas.

The invention provides bullet-shaped non-spherical microparticles and microcapsules. The matrix of the microparticles and microcapsules is polymerized photopolymerizable polymer. The tails of the microcapsules are smooth and connected, and the microcapsules have at least one mutually independent chamber, and the chamber contains an oil phase solution. The present invention also provides a method for continuously preparing the bullet-shaped non-spherical microparticles and microcapsules by using microfluidic technology. The technical solution of the present invention can improve the flow characteristics and movement speed of microparticles and microcapsules in channels, and improve the embolization effect of microparticles and microcapsules. The microcapsules provided by the present invention can realize the entrapment and transmission of active substances such as drugs.

The invention discloses an electric vehicle for reducing lift force and resistance and increasing mileage. The electric vehicle comprises air power structures arranged at the top tail and bottom of the electric vehicle. An air passage at the top tail of the vehicle weakens the separation of a gas boundary layer, reduces the rear wake area and finally leads the gas into the rear wake area, thus the shape resistance is reduced, and an effect of the electric vehicle of inhibiting gas separation through the air passage to increase the mileage is realized; since the air passage is arranged at the bottom of the electric vehicle, the air density at the vehicle bottom is reduced; the passage leads to left and right rear fenders, a rear bumper and a trunk cover, the air flow path is prolonged, the air speed is increased, and the vehicle lift force is reduced; the air is finally guided to the rear wake area, the wake area is downsized, the shape resistance is reduced, and the effects of the electric vehicle of reducing the vehicle lift force and increasing the mileage through the air passage are realized.

The invention discloses a stable-posture multi-degree-of-freedom controllable pod type underwater dragging body. The dragging body comprises a main body, a longitudinal inclination control mechanism,a heaving control mechanism and a bow changing control mechanism; the main body comprises a wing type pod, an inclined strut, a stand column, a longitudinal inclination control bin, a heaving controlbin and a cable hole; the wing type pod is of a water sealing cavity structure and is horizontally located at the lower portion of the main body, the longitudinal inclination control bin and the heaving control bin are each of a water sealing cavity structure and are arranged at the upper end of the wing type pod in a spaced mode through two stand columns, a heaving control hydrofoil of the heaving control mechanism is arranged in a gap of a longitudinal inclination control hydrofoil; the right end of the heaving control hydrofoil is in rigid connection with a heaving positioning shaft, and aheaving drive shaft penetrates through a through axle hole formed in the left side of the gap of the longitudinal inclination control hydrofoil and is in rigid connection with a heaving turbine; a heaving worm is meshed with the heaving turbine, and the heaving worm is connected with a heaving servo motor; the dragging body has the advantages that towing resistance is small, multiple degrees of freedom are controllable, the motion control posture is stable, and bin arrangement is reasonable.

The invention discloses a method for improving the heat exchange reinforcement effect of a vortex generator by use of punching jet flow, belonging to the field of heat exchange reinforcing technology. A hole is formed in a proper position on the windward surface of a wing-type or column-type vortex generator, thus the fluid at the front part of the vortex generator passes through the hole and scours the flow dead area or weak heat transfer area of the leeward surface of the vortex generator, thus the average flow rate and kinetic energy of the area are improved, the weak heat transfer area is eliminated, and the effects of heat exchange reinforcement and flowing resistance reduction of the vortex generator as well as the efficiency of the heat exchanger are further improved; and meanwhile, since the area of the windward surface of the vortex generator and the range of the flowing separation area are reduced by punching, the form resistance of the vortex generator is reduced, thus the flowing loss is reduced. The method has the characteristics of convenience in processing, simple manufacturing and obvious effect, and has wide application prospects and popularization values in the aspect of reinforcement gas-side heat exchange of a gas-liquid or gas-gas heat exchanger.

The invention provides a ship hydrodynamic comprehensive energy-saving device and an installation method thereof. The ship hydrodynamic comprehensive energy-saving device is characterized in that it includes a propeller-rudder combined vortex-eliminating energy-saving device for dissipating energy of the vortex generated by the propeller, and the propeller-rudder The combined vortex-elimination and energy-saving device is fixedly installed at the tail of the propeller tail shaft and rotates with the rudder blade; it includes a combined energy-saving rectifying fin installed on the rudder blade for vortex elimination and rectification; it includes the double tail fins installed on the ship body, and Front rectifier fin structure located in front of the propeller. This comprehensive energy-saving device aims at the shortcomings of the existing ship energy-saving technology, and adopts corresponding technical solutions to improve it in order to achieve the purpose of energy saving, and after organically and comprehensively utilizing all energy-saving methods, it can achieve the final energy-saving effect .

The invention discloses a technique to decrease resistance of straight-flow type water pump controlled valve, which comprises the following steps: setting the intake valve clap as circular arc; setting cone lid as cone; forming a flow guiding body with the intake valve clap and the cone lid. This invention possesses reasonable craft and good idea, which can be spreaded widely.

The invention discloses a pre-rotation triangular conduit for a right-handed rotation single screw vessel. The pre-rotation triangular conduit has a fan-shaped structure; seen from the rear side of a screw propeller, a second blade and a first blade are arranged from top to bottom on the left side of a longitudinal central line of a propeller hub of the screw propeller, and a third blade is arranged on the right side; a blade back of a guide plate is fixedly connected with a blade tip of the first blade, a blade tip of the second blade and a blade tip of the third blade respectively; the included angle range of the first blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees; the included angle range of the second blade and the longitudinal central line of the propeller hub of the screw propeller is 25-30 degrees; and the included angle range of the third blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees. By using the principle of pre-rotation before the propeller and screw propeller upper inlet flow acceleration, the pre-rotation triangular conduit is a piece of body energy saving equipment with more uniform inlet flow of the screw propeller disk; and importantly, the energy lost due to rotation of a wake flow field of the screw propeller is reduced, the screw propeller propulsive efficiency is improved and the additional form resistance due to tail flow separation is reduced.