Flow-induced vibration in the compressible cavity flow

Hao Li1, Jianguo Tan2, Juwei Hou3

Science and Technology on Scramjet Laboratory, National University of Defense Technology,
Changsha, Hunan Province, People’s Republic of China

2Corresponding author

E-mail: 1haolee0928@163.com, 2jianguotan@nudt.edu.cn, 3272256727@qq.com

Received 10 September 2017; accepted 18 September 2017

DOI https://doi.org/10.21595/vp.2017.19154

 

Abstract. The cavity plays an important role in the fuel-air mixing and combustion stability inside the hypersonic scramjet. However, the high levels of time-dependent loading resulting from the supersonic cavity flow can cause intense structural vibration even damage. Experiments and numerical simulations were performed to understand the complex fluid-structure interaction in this paper. A cantilever plate with a cavity was installed as a splitter plate in the supersonic mixing layer wind tunnel. The response displacements of this cantilever plate were measured by a non-intrusive laser vibrometer. Large eddy simulation (LES) was applied to calculate the aerodynamic loading. Results show that the  number of time-dependent surface-averaged pressure difference agrees well with semi-empirical relation of Heller used to predict the resonance mode. The cantilever plate exhibits a directly dependent response to self-oscillation of supersonic cavity flow. Measurement results of displacement indicate that the vibration shape of this plate is dominantly two-dimensional.

Keywords: flow-induced vibration, supersonic cavity flow, cantilever plate, fluid-structure interaction.

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Cite this article

Li Hao, Tan Jianguo, Hou Juwei Flow‑induced vibration in the compressible cavity flow. Vibroengineering PROCEDIA, Vol. 14, 2017, p. 238‑243.

 

© JVE International Ltd. Vibroengineering PROCEDIA. Oct 2017, Vol. 14. ISSN 2345-0533