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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (1): 625915-625915.doi: 10.7527/S1000-6893.2021.25915

• Special Topic of Shock/Boundary Layer Interation Mechanism and Control • Previous Articles     Next Articles

Decomposition of mean friction drag in compression-expansion turbulent boundary layer

DUAN Junyi1,2, TONG Fulin1,3,4, LI Xinliang1,2, LIU Hongwei1   

  1. 1. State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    4. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2021-06-07 Revised:2021-08-04 Online:2022-01-15 Published:2022-02-14
  • Supported by:
    National Key R&D Program of China (2019YFA0405300, 2016YFA0401200);National Natural Science Foundation of China (91852203);National Numerical Windtunnel Project;Science Challenge Project (TZ2016001);Strategic Priority Research Program of Chinese Academy of Sciences (XDC01000000, XDA17030100)

Abstract: The interaction between the shock wave with Mach number 2.9 and the turbulent boundary layer in the configuration of 24° compression-expansion corners is investigated by using direct numerical simulation. The influence of normal height of the expansion corner on the shock wave interaction region and downstream boundary layer is analyzed. It is found that when the height is large enough, the shock wave interaction region is not affected by the downstream expansion wave, and the characteristics are consistent with those of the traditional compression corner configuration. While the height is small, the reattachment process of the detached shear layer is accelerated by the downstream expansion wave, which causes the reattachment point to move upstream and the separation bubble to shrink dramatically. The decomposition of mean friction drag is applied to the turbulent boundary layer of the upstream and downstream plates, and the difference between the turbulent boundary layer in equilibrium and nonequilibrium state is explored. It is found that the high friction in the expansion corner is mainly related to the Cf1 term and Cf3 term in the decomposition of mean friction drag. The height has little effect on the Cf1 term, while significant effect on the Cf2 term. Height variation is reflected in the contribution of the Görtler vortex and re-laminar phenomenon on the downstream plate to the Cf2 term.

Key words: shock wave/turbulent boundary layer interaction, compression-expansion corner configuration, direct numerical simulation, decomposition of mean friction drag, Görtler vortex

CLC Number: