Acoustic Modeling and Vibration Characteristics of Supersonic Inlet Buzz

Jianfeng Zhu, Wenguo Luo, Yuqing Wei, Cheng Yan and Yancheng You
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Jianfeng Zhu: School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
Wenguo Luo: School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
Yuqing Wei: School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
Cheng Yan: School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
Yancheng You: School of Aerospace Engineering, Xiamen University, Xiamen 361005, China

Energies, 2020, vol. 13, issue 8, 1-19

Abstract: The buzz phenomenon of a typical supersonic inlet is analyzed on the basis of numerical simulations and duct acoustic theory. Considering that the choked inlet could be treated as a duct with one end closed, a one-dimensional (1D) mathematical model based on the duct acoustic theory is proposed to describe the periodic pressure oscillation of the little buzz and the big buzz. The results of the acoustic model agree well with that of the numerical simulations and the experimental data. It could verify that the dominated oscillation patterns of the little buzz and the big buzz are closely related to the first and second resonant mode of the standing wave, respectively. The discrepancies between the numerical simulation and the ideal acoustic model might be attributed to the viscous damping in the fluid oscillation system. In order to explore the damping, a small perturbation jet is introduced to trigger the resonance of the buzz system and the nonlinear amplification effect of resonance might be helpful to estimate the damping. Through the comparison between the linear acoustic model and the nonlinear simulation, the calculated pressure oscillation damping of the little buzz and the big buzz are 0.33 and 0.16, which could be regarded as an estimation of real damping.

Keywords: supersonic inlet buzz; acoustic modeling; oscillation amplitude; damping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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