Simulation Study of Bionic Jetting Direction Influence on Drag Reduction Effect

Gang ZHAO, Hua-lin ZHAO, Hai-sheng SHU, Dan ZHAO, Yun-qing GU, Dong-lai XIA


By imitating the jetting flow feature of shark gills,a bionic jetting model is established by arranging round outlets on a flat plate. The drag reduction effect under different jetting directions are explored using numerical simulation method when the main flow field velocity was 20m/s and the reasons of drag reduction are analyzed simultaneously. The results of simulation showed that:different jetting directions affecte the wall shear stress and static pressure of flow field which result in the changing of viscous resistance and pressure drag; the bionic jetting has the best drag reduction effect when jetting direction angle is 30 degrees; under different jetting direction conditions, the main reason of drag reduction is the substantially decreased pressure drag. Key words:bionics; drag reduction; jetting flow; numerical simulation; viscous resistance; pressure drag


bionics; drag reduction; jetting flow; numerical simulation; viscous resistance; pressure drag

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