Simulation and Analysis of Flow Field Control in Bionic Jet Surface for Drag Reduction

Abstract:

Numerical simulation was used with SST turbulence model on the drag reduction characteristics of bionic jet surface, which clarified the reason that the bionic jet surface could reduce the frictional resistance and the control behavior to the flow field near the wall. Results show that when the area of the jet hole is constant, the higher the ratio of the length along the longitudinal direction of jet hole and that of jet surface is, the better the drag reduction effect is. With the jet speed and jet flux increasing, the drag reduction rate will increase gradually until the maximum of 35.97%. The frictional resistance of bionic jet surface will decrease by increasing the area of reverse flow and decreasing the velocity gradient of the wall; the control behavior of jet surface to boundary layer embodies the shear stress in the bottom of boundary layer caused by the reverse flow in the back flow surface is opposite to the main flow field direction when the shear flow near the wall converges the jet impedance, which causes the low speed reverse rotating vortex pair in the downstream of jet hole, the secondary vortex near the wall caused by the extent of reverse vortex towards the downstream can increase the boundary bottom layer thickness and decrease the velocity gradient and frictional resistance.

• Periodical: Applied Mechanics and Materials (Volume 461)
• Pages: 746-750
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.461.746
• Online since: November 2013
• Authors: Zhao Gang, Fang Li, Jun Wei Du, Muhammad Farid, Dong Yang Zang
• Keywords: Bionic Jet Surface, Boundary Layer, Drag Reduction, Engineering Bionics, Numerical Simulation

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