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Experimental visualization of aerodynamic sound sources using parallel phase-shifting interferometry
Experiments in Fluids ( IF 2.4 ) Pub Date : 2020-09-02 , DOI: 10.1007/s00348-020-03038-x
Risako Tanigawa , Kohei Yatabe , Yasuhiro Oikawa

Abstract

Aerodynamic sound is one of the causes of noise in high-speed trains, automobiles, and wind turbines. To investigate the characteristics of aerodynamic sound generation, measurements around the sound sources are required. Aerodynamic sound is typically measured using microphones. However, microphones cannot capture the near-field of aerodynamic sound because they become new noise sources inside the air flow. To observe the aerodynamic sound near-field, we performed two-dimensional visualization of aerodynamic sound using an optical method. The optical method used in this research, parallel phase-shifting interferometry (PPSI), can detect the pressure within the measurement area as variations of the phase of light. PPSI can therefore visualize the pressure fields. We visualized both the sound pressure and flow components of the sound generated by flow around a square cylinder and flat plates. The visualized pressure fields are provided as animations in the online resources. Analysis of the sound and flow component time variations confirmed the correlations between them.

Graphic abstract



中文翻译:

使用平行相移干涉术对空气动力声源进行实验可视化

摘要

空气动力学声音是高速火车,汽车和风力涡轮机中噪音的原因之一。为了研究空气动力学声音产生的特性,需要在声源周围进行测量。空气动力学声音通常使用麦克风进行测量。但是,麦克风无法捕获空气动力学声音的近场,因为它们成为气流内部的新噪声源。为了观察空气动力声的近场,我们使用光学方法对空气动力声进行了二维可视化。这项研究中使用的光学方法,平行相移干涉术(PPSI),可以检测到测量区域内的压力作为光相位的变化。因此,PPSI可以可视化压力场。我们可视化了围绕方形圆柱体和平板的流动所产生的声音的声压和流动分量。在线资源中以可视化的压力场作为动画提供。对声音和气流分量时间变化的分析证实了它们之间的相关性。

图形摘要

更新日期:2020-09-02
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