A 56CH MEMS microphone array for measuring wall pressure fluctuation field

Yoshitsugu Naka, Atsuki Miyajima

研究成果: Paper

抜粋

The present study aims to develop a 56ch MEMS microphone array for turbulent wall pressure fluctuation measurement. 56 microphones are controlled by a FPGA, and the microphones are arranged in line to obtain spanwise distributions of the wall pressure fluctuations in a turbulent boundary layer. Output data of the MEMS microphones are converted to the actual pressure fluctuations based on the calibration using a reference microphone. The background noise in the wind-tunnel is reduced by splitting the data into POD modes. The noise-reduced data are reconstructed by excluding the modes containing significant amount of noise. The normalized RMS values of the wall pressure fluctuations are in good agreement with the data in the literature, and the power spectra show smooth curves down to the wall unit frequency. Two-dimensional fluctuating wall pressure field and the two-point correlation of fluctuating wall pressure indicate contributions of the turbulent flow structures. The present method can be extended to build a massively parallel fluctuating pressure measurement system.

元の言語English
出版物ステータスPublished - 1 1 2019
イベント11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
継続期間: 30 7 20192 8 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
United Kingdom
Southampton
期間30/07/192/08/19

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これを引用

Naka, Y., & Miyajima, A. (2019). A 56CH MEMS microphone array for measuring wall pressure fluctuation field. 論文発表場所 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.