Compound resistance reduction device with electromagnetic ribs and used for controlling turbulent boundary layer of navigation body
A boundary layer and vehicle technology, applied in fluid flow, mechanical equipment, etc., can solve the problems of limited drag reduction effect, unchangeable size, narrow application range, etc., to achieve extended service life, good drag reduction effect, and reduced turbulent state. Effect
Inactive Publication Date: 2017-10-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology
The size of the surface cannot be changed after machining, so a good drag reduction effect can only be obtained under specific incoming flow conditions, the scope of application is narrow, and the general drag reduction effect of passive control is relatively limited
Method used
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Embodiment 1
[0031] The size of the base 3 is 205 mm×115 mm, the size of the magnet 1 used is 4 mm×110 mm, the height of the magnet 1 is 8 mm, the interval between each adjacent magnet 1 is 4 mm, the size of the electrodes 2 used is 4 mm×80 mm, each adjacent The electrodes 2 are spaced 4mm apart, and the magnet 1 is 4mm higher than the electrodes 2. There are 25 magnets 1 and 24 electrodes 2 . The experiment was carried out in a water tunnel, using a copper sulfate solution with a density and conductivity close to that of seawater, and installing the present invention on a moving bed at the bottom of the transparent observation section, through a displacement sensor and a flow test system including tracer particles and PIV. Observe the changes in wall resistance and flow field. When the invention is not installed, fully developed turbulent flow can be obtained in the observation section, the wall surface resistance is relatively large, and pseudo-ordered structures including strips and fl...
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The invention discloses a compound resistance reduction device with electromagnetic ribs and used for controlling the turbulent boundary layer of a navigation body. The compound resistance reduction device comprises magnetic bodies, electrodes, a base, a fixing frame and an electrode controller, wherein the magnetic pole directions of the magnetic bodies are parallel to the normal direction; the plurality of magnetic bodies and the plurality of electrodes are arranged at intervals on the base in sequence in the flow direction; the electrodes are lower than the magnetic bodies; a groove is formed between each of the magnetic bodies and the adjacent electrode; the fixing frame is arranged at the tops of the plurality of magnetic bodies; the plurality of magnetic bodies are connected through the fixing frame; and each of the plurality of electrodes is connected with the electrode controller through a guide wire. According to the compound resistance reduction device with electromagnetic ribs and used for controlling the turbulent boundary layer of the navigation body, the method that the active control (electromagnetic force) and the passive control (ribs) are combined is adopted, so that near wall coherent structures in the boundary layer of the navigation body and turbulent bursting events are effectively inhibited, the resistance of the wall surface is greatly reduced, and the characteristics that the vortex is suppressed, the vibration is attenuated, the noise is reduced and the corrosion to the electrodes caused by the ionizing effect is reduced are achieved.
Description
technical field [0001] The invention relates to the field of flow control, in particular to an electromagnetic rib composite drag reducer used for controlling the turbulent boundary layer of a vehicle. Background technique [0002] When all kinds of ground vehicles, aircraft, and underwater vehicles are running at high speeds, their energy consumption is mainly used to overcome the surface frictional resistance from the boundary layer. For example: for conventional watercraft, its surface frictional resistance accounts for about 50% of the total resistance; for submarines moving underwater, this ratio can reach 70%. In most areas of the surface of these vehicles, the flow is in a turbulent state, and the wall turbulence will cause a sharp increase in the wall resistance. Therefore, if the surface frictional resistance of these vehicles can be reduced through wall turbulence control technology, a large amount of energy consumption can be saved, the performance of the vehicle...
Claims
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IPC IPC(8): F15D1/00
CPCF15D1/0075
Inventor 张辉韩洋刘梦珂范宝春
Owner NANJING UNIV OF SCI & TECH