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Generation and propagation of pressure waves in supersonic deep-cavity flows

机译：超声速深腔流中压力波的产生与传播

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摘要

The mechanism behind cavity-induced pressure oscillations in supersonic flows past a deep rectangular cavity is not well understood despite several investigations having been carried out. In particular, the process by which the pressure wave is generated and the path of the pressure wave propagating inside the cavity remains unclear. In the present study, the pressure waves around a deep rectangular cavity over which nitrogen gas flows at a Mach number of 1.7 are visualized using the schlieren method. The length of the cavity is 14.0 mm. The depths of the cavity are selected as 20.0 and 11.7 mm, corresponding to length-to-depth ratios of 0.70 and 1.2, respectively. The pressure waves propagating inside as well as outside the cavity have been successfully visualized using a high-speed camera, and the propagation pattern of these waves is found to be different from that previously predicted by numerical simulation and from those expected in previous oscillation models. In addition, the pressure oscillation near the trailing edge of the cavity is also measured using semiconductor-type pressure transducers simultaneously with the capture of the schlieren images. As a result, the relationship between the shear-layer motion, pressure-wave generation, and pressure oscillation at the trailing edge of the cavity is clarified experimentally.
机译：尽管已经进行了几项研究，但对超声流通过深矩形腔后腔中引起的压力振荡背后的机理仍未完全了解。特别地，产生压力波的过程和压力波在腔体内传播的过程仍然不清楚。在本研究中，使用schlieren方法可视化了一个深矩形腔周围的压力波，氮气以1.7马赫数流过该矩形腔。空腔的长度为14.0毫米。腔的深度选择为20.0和11.7毫米，分别对应于0.70和1.2的长深比。已使用高速摄像机成功观察了在腔体内以及腔体外部传播的压力波，发现这些压力波的传播方式与先前通过数值模拟预测的和在先前振荡模型中预期的不同。另外，还使用半导体类型的压力传感器并同时获取schlieren图像来测量腔体后缘附近的压力振荡。结果，通过实验弄清了剪切层运动，压力波产生和腔体后缘处的压力振荡之间的关系。

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  • 来源
    《Experiments in Fluids》 |2012年第6期|p.1855-1866|共12页
  • 作者

    Taro Handa; Hiroaki Miyachi; Hatsuki Kakuno; Takaya Ozaki;

  • 作者单位

    Department of Energy and Environmental Engineering, Kyushu University, 6-1 Kasuga-Koen, Kasuga City, Fukuoka, 816-8580, Japan;

    Power Systems Plant Engineering Department, Mitsubishi Heavy Industries, 2-1-1 Shinhama Arai-Cho, Takasago, Hyogo, 676-8686, Japan;

    Plant and Machinery Division, Nippon Steel &amp Sumikin Engineering, 46-59 Nakabaru, Tobata-Ku, Kitakyushu, Fukuoka, 804-8505, Japan;

    Department of Energy and Environmental Engineering, Kyushu University, 6-1 Kasuga-Koen, Kasuga City, Fukuoka, 816-8580, Japan;

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