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Simulation Study on Drag Reduction Characteristics of Bionic Jet Flow Based on Shark Gill

GU Yun-qing 1,ZHAO Gang 1,ZHAO Hua-lin 1,ZHENG Jin-xing 1,WANG Fei 1,XIAO Lei 2,LIU Wen-bo 1(1.College of Mechanical and Electrical Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China;2.Mining Area Service Enterprise Department,Daqing Oil Field Company Ltd,Daqing 163000,Heilongjiang,China)  
A bionic jet model based on the feature of shark gill was established for the characteristics of flow field on the bionic jet surface.The drag reduction characteristics and drag reduction mechanisms of bionic jet flow based on shark gill were studied using numerical simulation method at the main flow field velocity of 3 m/s and the jet velocity of 0.02~1 m/s.The results show that: the bionic jet flow based on shark gill has a drag reduction effect when the jet velocity u is more than 0.1 m/s,and the drag reduction rate increases with jet velocity.The bionic jet flow based on shark gill affects the drag reduction characteristics of model by changing the frictional resistance and pressure drag.The mechanism of bionic jet flow influencing on frictional resistance is that the thickness of viscous sublayer at the downstream of jet outlet increases and the velocity gradient reduces.And a reverse eddy forms,which makes the flow field have a stable large vortex structure and reduce the influence of turbulent fluctuation on the wall.The mechanism of bionic jet flow influencing on pressure drag is that the jet velocity,as an additional power,inhibits the differential pressure resistance,resulting in its decline.
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