高马赫数层流摩阻数值计算精度

doi:10.7527/S1000-6893.2021.25737

Abstract

Abstract: The prominent viscous effect of vehicles flying at a high speed and altitude leads to the necessity of precise skin friction prediction for the key aerodynamic performance of the vehicles. However, the skin friction obtained from numerical calculation, currently the main approach to skin friction prediction, has a large gap from that of the tunnel test in the high Mach number laminar flow. The key factors influencing friction numerical prediction precision such as numerical dissipation of the space scheme and wall temperature boundary conditions were studied. With typical characteristics of high speed vehicles, a cone with a sharp nose and a delta wing were investigated considering the tunnel test results in the study. The results showed that less numerical dissipation results in more accurate skin friction calculation, and that closing the entropy fix in regions near the wall in the boundary layer helps to improve the calculation precision of skin friction. Additionally, the wall temperature boundary conditions also have an important effect on the skin friction calculation in the high Mach number flow. Finally, the requirements for high-precision skin friction numerical prediction are proposed based on the analysis results and engineering demands.

Key words: high Mach number, laminar flow, friction calculation, numerical dissipation, boundary conditions, NNW-Flowstar

CLC Number:

V211.3

FAN Yuehua, DUAN Yee, ZHOU Naizhen, YANG Pan. Friction numerical calculation precision in high Mach number laminar flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(9): 625737-625737.

References

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Friction numerical calculation precision in high Mach number laminar flow

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