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Study of unsteady phenomena of breakdown of tip vortex generated at supersonic flow field during the pass through oblique shock wave

超声速流场斜激波通过时尖端涡破裂非定常现象研究

基本信息

批准号：
09650214
负责人：
KASHIMURA Hideo
金额：
$ 1.73万
依托单位：
Kitakyushu National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650214/
关键词：
Compressible flow Shock wave Diffraction Vortex Unsteady flow 可視化超音速噴流

项目摘要

The unsteady phenomena of the flow field with the breakdown of the vortex by interaction with the shock wave was investigated in this study. The numerical analysis using the TVD method for the diffraction of the propagating shock wave at the sharp corner was carried out and the unsteady characteristics of the vortex behind the secondary shock wave was discussed. The flow visualization by means of the schlieren method was carried out to investigate the flow field with the interaction of vortex and a oblique shock wave was also carried out and the temperature distribution on the wedge surface was measured by the thermo-sensitive liquid crystal sheet with image processing system.obtained results from the numerical and the experimental analysis are as follows ; 1.The temperature distribution on a wedge surface caused by interaction with a shock wave and vortex is clearly showed in the thermo-sensitive liquid crystal sheet. 2.The distortion of an oblique shock wave was observed by the interaction with vortex and influences to the position of a shock wave and a temperature distribution on a wedge surface was cleared. It is shown that the distortion of the oblique shock wave strongly depends on the pressure ratio of flow field and the position of a vortex generator. 3.By means of the pass through the vortex at the corner behind the diffracting shock of a opposite shock wave, the roll up of vortex to the corner is occurred and the triple point and the slip surface is generated.

本文研究了激波作用下涡流破裂后流场的非定常现象。利用TVD法对激波在陡角处的衍射进行了数值分析，讨论了二次激波后旋涡的非定常特性。采用纹影法对旋涡与斜激波相互作用下的流场进行了显示研究，并采用带图像处理系统的热敏液晶片测量了楔形表面的温度分布。数值分析和实验分析结果如下：1.在热敏液晶片上清晰地显示了激波和涡旋相互作用下楔形表面的温度分布。2.通过与涡旋的相互作用，观察到斜激波的畸变，并澄清了对激波位置和楔形表面温度分布的影响。结果表明，斜激波的畸变很大程度上取决于流场的压力比和涡发生器的位置。3.通过对向激波绕射激波后拐角涡的通过，发生了涡向拐角的卷起，产生了三相点和滑移面。