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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (4): 120263-120263.doi: 10.7527/S1000-6893.2016.0263

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Numerical evaluation method of turbulence drag reduction with riblets

ZHOU Jian1, OU Ping1, LIU Peiqing2, GUO Hao2   

  1. 1. China Academy of Aerospace Aerodynamics, Beijing 100074, China;
    2. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China
  • Received:2016-03-25 Revised:2016-09-26 Online:2017-04-15 Published:2016-09-28

Abstract:

In order to apply numerical simulation method based on Reynolds-averaged Navier-Stokes (RANS) equations to drag reduction with riblets, inspired by the roughness model-Wilcox and after a deeper study on the effect of the value of ω near wall in k-ω shear stress transport (SST) turbulence model, it turns out that an increasing of wall ω in viscous sublayer leads to a decreasing of turbulent kinetic energy, turbulent viscosity and Reynolds shear stress, which shows the same change as realistic riblets. Based on the classical experimental data of riblets with symmetric V grooves (height=width), by introducing the effect factors pressure gradients and yaw angle, a modeling function between riblets geometry size and the value of wall ω is established in complex flow conditions. Comparing with the experimental data confirms that the modeling riblets can predict the drag reduction as realistic riblets. Besides, a detailed application method of modeling riblets is proposed. At last, an overall design and evaluation of the drag reduction by riblets is given in the case of the C919 wing-body combination.

Key words: riblet, turbulence drag reduction, k-ω shear stress transport, modeling function, numerical simulation

CLC Number: