Three-Dimensional Visualization of Shock Cell Structure and Screech Tone Emission in Underexpanded Circular Jet

Keita Ozawa; Takayuki Yamagata; Nobuyuki Fujisawa

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Three-Dimensional Visualization of Shock Cell Structure and Screech Tone Emission in Underexpanded Circular Jet

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摘要

The three-dimensional visualization of flow and screech-tone emission from an underexpanded circular jet is first investigated experimentally using high-speed cross-schlieren imaging and microphone measurements in the cross-sectional planes along the jet axis. This experimental technique allows the visualization of the shock-cell structure, directivity of sound intensity, and frequency spectrum in the cross-sectional planes of the screeching jet. The high-speed cross-schlieren observation of the screeching jet shows the occurrence of an asymmetrical shock-cell structure that is generated by the flapping mode in the screeching jet. This contributes to the generation of a screech tone propagating upstream along the jet axis and non-uniform sound intensities around the jet in circumferential direction. These observations by high-speed cross-schlieren imaging were validated by the microphone measurements.

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《流量控制、测量及可视化（英文）》 |2022年第1期|1-11|共11页
作者
Keita Ozawa; Takayuki Yamagata; Nobuyuki Fujisawa;
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作者单位

Graduate School of Science and Technology;

Niigata University;

Niigata;

Japan;

Department of Mechanical Engineering;

Niigata University;

Niigata;

Japan;

Department of Mechanical Engineering;

Shinshu University;

Nagano;

Japan;

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原文格式 PDF
正文语种 chi
中图分类流体力学;
关键词
Screech Tone; Aeroacoustics; Directivity; Frequency Spectrum; Underexpanded Circular Jet; Schlieren Imaging;

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1. A Numerical Study on Jet Structure and Noise Emission of Underexpanded Radial Jet [J] . Takumi Nojima ,Yoko Sakakibara ,Masaki Endo . 流体动力学（英文） . 2019,第1期
2. On the Existence of Subharmonic Screech in Choked Circular Jets from a Sharp-Edged Orifice [J] . Max Kandula . 声学期刊（英文） . 2014,第1期
3. Structure and Oscillation of Underexpanded Jet [J] . Hiromasa Suzuki ,Masaki Endo ,Yoko Sakakibara . 流体动力学（英文） . 2013,第2期

Three-Dimensional Visualization of Shock Cell Structure and Screech Tone Emission in Underexpanded Circular Jet

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