Research on Drag Reduction Effect of Concave Non-Smooth Surface in Air

Abstract:

The standard k-ε turbulence model was used to simulate the flow of a new unsmooth surface - dimple concave surface in air and the drag reduction coefficients of both unsmooth surface and smooth surface with hemisphere of 0.4mm radius were presented. The result showed that this kind of unsmooth surface had a good drag reduction effect for flow velocity ranging from 4m/s to 48m /s. And it had the best reducing ability (7.2%) at a velocity of 24 m/s. The theory of the drag reduction was finally analyzed.

• Periodical: Advanced Materials Research (Volumes 299-300)
• Pages: 7-11
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.299-300.7
• Online since: July 2011
• Authors: Zhong Xu, Shu Zhao Li, Xiao Yan Wu, Xi Jiang Zhao
• Keywords: Boundary Layer, Dimple Concave, Drag Reduction, Non-Smooth Surface, Numerical Simulation

References

[1] Viswanath P R: Progress in Aerospace Sciences Vol. 38(2002), p.571.

[2] Robert J P : AGARD Report (1992), p.786.

[3] Reif W F: Abhandlungen Band Vol. 164(1982), p.172.

[4] Bechert D W, M. Bruse and W. Hage: Experiments in Fluids Vol. 28(2000), p.403.

[5] Walsh M J : AIAA Vol. 82(1982), p.169.

[6] Bechert D W, Hoppe G: AIAA Vol. 85(1985), p.546.

[7] Walsh M J : AIAA Journal Vol. 21(1983), p.485.

[8] Bearman PW, Harvey J K: AIAA J Vol. 31(1993), p.1753.

[9] Zhang C C, Ren L Q: Acta Aerodynamica Sinica Vol. 16(2008), p.79.

[10] Yang H W, Gao G : Acta Aeronautica Et Astronautica Sinica Vol. 18(1997), p.455.