| 壁面压力传声器阵列测量--后台阶湍流相干结构的相关分析 |
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| 引用本文： | 刘应征,柯峰,Hyung Jin SUNG. 壁面压力传声器阵列测量--后台阶湍流相干结构的相关分析[J]. 上海交通大学学报, 2005, 39(8): 1371-1374 |
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| 作者姓名： | 刘应征 柯峰 Hyung Jin SUNG |
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| 作者单位： | 上海交通大学,机械与动力工程学院,上海,200030;韩国科学技术研究院机械工程系,大田305-701 |
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| 摘 要： | 介绍了湍流边界层壁面压力脉动的传声器阵列测量方法，并采用30个电容式ICP型传声器阵列同步采样测量了低速风洞中后台阶分离再附湍流的壁面压力脉动。压力功率谱和压力脉动系数分布表明，低频大尺度旋涡结构为分离再附湍流流动主要成分。对原始信号进行数字滤波并通过自相关分析，计算得到分离再附湍流中低频大尺度相干结构的相关尺度变化特征和输运速度等参数。
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| 关 键 词： | 传声器阵列 壁面压力脉动 分离再附流 相关分析 |
| 文章编号： | 1006-2467(2005)08-1371-04 |
| 收稿时间： | 2004-07-26 |
| 修稿时间： | 2004-07-26 |
Wall-Pressure Fluctuations Measurement Using Microphone Array--Correlation Analysis of Coherent Structure in Backward-Facing Step Flow |
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| Liu Ying-zheng,Ke Feng,Hyung Jin SUNG. Wall-Pressure Fluctuations Measurement Using Microphone Array--Correlation Analysis of Coherent Structure in Backward-Facing Step Flow[J]. Journal of Shanghai Jiaotong University, 2005, 39(8): 1371-1374 |
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| Authors: | Liu Ying-zheng Ke Feng Hyung Jin SUNG |
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| Abstract: | The measurement of wall-pressure-fluctuations of turbulent flows using microphone array was introduced. Simultaneous measurements of wall-pressure-fluctuations of turbulent separated and reattaching flow over a backward-facing step were performed using 30 microphones. The comparative analysis using auto-spectrum and wall-pressure-fluctuations coefficients demonstrates that the flow is characterized by low-frequency motions of large-scale vertical structures. Spatial scale and convection velocity of low-frequency coherent vortical structures embedded in the turbulent flow were revealed in terms of auto-and cross-correlation analysis of low-pass filtered wall-pressurec-fluctuations. |
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| Keywords: | microphone array wall pressure fluctuations separated and reattaching flow correlation analysis |
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