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Volume 49 Issue 8
Aug.  2023
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Journal of Beijing University of Aeronautics and Astronautics  > 2023  >  49(8): 1940-1947.
ZHANG P H，CHENG X H，CHEN H Y，et al. Unsteady flow mechanism of high Mach number cavity[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（8）：1940-1947 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0609
Citation: ZHANG P H，CHENG X H，CHEN H Y，et al. Unsteady flow mechanism of high Mach number cavity[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（8）：1940-1947 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0609
shu

Unsteady flow mechanism of high Mach number cavity

doi: 10.13700/j.bh.1001-5965.2021.0609
  • 1.

    Computational Aerodynamic Institute of China Aerodynamic Research & Development Center，Mianyang 621000，China

  • 2.

    Aerospace Times FeiHong Technology Company Limited，Beijing 100094，China

Funds:

National Numerical Windtunnel Project 

More Information
  • Corresponding author: E-mail：rorzey@cqjj8.comu.cn
  • Received Date: 15 Oct 2021
  • Accepted Date: 17 Jan 2022
  • Publish Date: 10 Mar 2022
    Abstract

  • The cavity flow widely exists in aircraft, and the flow in embedded weapon bay is one of the most typical cavity flows. The cavity flow has a complex structure and generates strong pressure fluctuations due to the interaction of shear layers, vortices, and shock waves. Using the unstructured hybrid mesh, a hybrid algorithm of central and upwind schemes is developed that focuses on the properties of high Mach number cavity flow. The cavity first-order and second-order dominant frequencies are calculated and verified by the numerical example of the high Mach number cavity standard model, with an error of no more than 5% compared with the experiment data. The cavity noise intensity has an error of no more than 10 dB compared with the experiment data, which verified the reliability of the method. The studies on the fluctuation characteristics of high Mach number (Ma> 2) cavity flow has been carried out with the numerical simulation method. The impact of various Mach numbers on the cavity's sound pressure level was examined, and it was also described how the cavity fluctuates acoustically at various Mach numbers. It is shown that the coupling between shear layer dynamics and cavity acoustics decreases at high Mach number conditions, and the physical mechanism of cavity oscillation changes from the vortex acoustic resonance mechanism of the Rossiter model to the closed-box acoustic mechanism as the Mach number increases.

     

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