On the Low Frequency Pressure Fluctuation in a ۳/۴ Open Jet Automotive Wind Tunnel
Publish place: Journal of Applied Fluid Mechanics، Vol: 12، Issue: 5
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JAFM-12-5_001
تاریخ نمایه سازی: 15 دی 1400
Abstract:
In the present research, a possible generation mechanism of low-frequency buffeting phenomenon based on a ۱:۱۵ open jet automotive wind tunnel was investigated. Evolution of vortex structures and pressure field in the plenum chamber have been visualized and analyzed by Large-eddy simulation (LES). It is shown that the low frequency pressure fluctuation is caused by the large-scale structures and their interaction. Multiple proper orthogonal decomposition was adopted to analyze the flow field in the plenum chamber. The characteristic frequencies of the vortex-rings after pairing is the same as the dominant resonance of buffeting at this wind velocity.
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Authors
Q. Jia
Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, ۲۰۱۸۰۴, China
Y. Zhu
Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, ۲۰۱۸۰۴, China
D. Bao
Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, ۲۰۱۸۰۴, China
M. M. Rashidi
Department of Civil Engineering, School of Engineering, University of Birmingham, Edgbaston, Birmingham, B۱۵ ۲TT, United Kingdom
Z. Yang
Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai, ۲۰۱۸۰۴, China