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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (11): 123791-123791.doi: 10.7527/S1000-6893.2020.23791

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Noise-turbulence relationship in hypersonic flow

YUAN Xiangjiang, SHA Xinguo, SHI Xiaotian, GAO Jun   

  1. China Academy of Aerospace Aerodynamics, Beijing 100074, China
  • Received:2020-01-01 Revised:2020-04-06 Online:2020-11-15 Published:2020-08-03
  • Supported by:
    National Key R&D Program of China(2019YFA0405300); National Natural Science Foundation of China (11872348, 11802297)

Abstract: Extensive research on the influence of turbulence intensity on flow instability and boundary layer transition in incompressible flow has been conducted, resulting in the development and engineering application of some prediction models for boundary layer transition based on turbulence intensity. However, turbulence intensity is not easy to measure in compressible high-speed flow, posing significant difficulties in boundary layer transition prediction. Previous experimental results demonstrate that the noise level in high-speed flow (Mach number≥3) is one of the key factors affecting the boundary layer transition location and path. However, no theoretical conclusions have been drawn so far as to whether a relationship between the noise level and the turbulence intensity exists. Compared to the turbulence intensity, the noise level measurement is relatively easier in the high speed flow. Therefore, it is of theoretical significance and practical value to explore the quantitative relationship between the noise level and the turbulence intensity in the flow field. Typical disturbance waves in Euler’s system are discussed, focusing on the analysis of the essential correlation between the pressure fluctuations and velocity fluctuations. The theoretical relationships between the sound pressure level, the velocity curl and the turbulence intensity are derived, which is conducive to the establishment of a prediction model for high-speed boundary-layer transition and the exploration of the aerodynamic data correlation between flight and ground tests.

Key words: hypersonic, noise, turbulence, compressible flow, pressure fluctuations, transition

CLC Number: