声密度波动的时间分辨率测量使用相位移的马赫-泽恩德干扰仪
Eita Shoji1, Anis Maddi2, Guillaume Penelet2
1Department of Mechanical Systems Engineering, Tohoku University, 6-6, Aramaki, Aoba-ku, Sendai, 980-8579, Japan.
The Journal of the Acoustical Society of America
|April 4, 2024
概括
一个新的四步相位移干扰仪准确地测量了在刚性板附近的气体密度振荡. 结果与热声学理论一致,验证了热传递研究的技术.
科学领域:
- 流体动力学 流体动力学
- 光学计量学是指光学计量学.
- 声学 声学 在声学方面
背景情况:
- 传统的光学干涉测量为动态过程提供了有限的分辨率.
- 了解气体边界附近的气体行为对于热传递分析至关重要.
- 热声学理论描述了声音波与边界的热效应之间的相互作用.
研究的目的:
- 开发和验证用于测量声密度振荡的相位移动干扰测量技术.
- 为了研究气体密度波动在刚性板附近的时空分布.
- 将实验结果与已建立的热声学理论进行比较.
主要方法:
- 使用偏振马赫-泽恩德设置实施四步相位移干扰仪.
- 利用偏振摄像头在一个图像中捕捉四个偏振状态.
- 在连接到扬声器的矩形管道中测量声密度振荡.
主要成果:
- 开发的干扰仪成功测量了密度波动的幅度和相位.
- 实验数据与热声学理论的预测有很好的一致性.
- 在热边界层厚度与板间距的各种比率中实现了验证.
结论:
- 四步相位移干扰仪是分析声密度振荡的高精度技术.
- 这项研究证实了热声学理论在描述气体在刚性边界附近的行为时的有效性.
- 这种方法具有分析涉及声学边界相互作用的复杂热传递现象的潜力.
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