Identification of Noise Sources in High Speed Jets Via Correlation Measurements: A Review
Identification of Noise Sources in High Speed Jets Via Correlation Measurements: A Review
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通过相关测量识别高速喷气机中的噪声源：综述
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Panda
中科院分区：
文献类型：
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作者：
J. Bridges;J. Panda
在过去的几年里，通过直接相关测量来识别高速射流中的噪声源已经取得了重大进展。在这种技术中，流动中的湍流波动与远场声学特征相关。在20世纪70年代，出现了一股使用大多数侵入式探针和少数使用激光多普勒测速仪来测量湍流波动的工作热潮。后来的实验确定了“剪切噪声”作为浅角噪声的主要来源。评论中描述了这一时期的各种解释和批评。最近的进展，分子瑞利散射为基础的技术提供了一个完全非侵入性的手段测量密度和速度波动。这引起了人们对相关测量的新的兴趣。我们在不同马赫数、温度比和喷嘴结构的单股射流中进行了五组不同的实验。本文试图对这些工作中的相关数据进行总结。
Significant advancement has been made in the last few years to identify noise sources in high speed jets via direct correlation measurements. In this technique turbulent fluctuations in the flow are correlated with far field acoustics signatures. In the 1970 s there was a surge of work using mostly intrusive probes, and a few using Laser Doppler Velocimetry, to measure turbulent fluctuations. The later experiments established "shear noise" as the primary source for the shallow angle noise. Various interpretations and criticisms from this time are described in the review. Recent progress in the molecular Rayleigh scattering based technique has provided a completely non-intrusive means of measuring density and velocity fluctuations. This has brought a renewed interest on correlation measurements. We have performed five different sets of experiments in single stream jets of different Mach number, temperature ratio and nozzle configurations. The present paper tries to summarize the correlation data from these works.