Study on Shock-Vortex interaction based on Flow Visualization by a Stereo-Shadowgraph Method

基于立体阴影图法流动可视化的冲击-涡相互作用研究

基本信息

批准号：
10650192
负责人：
MINOTA Toyoko
金额：
$ 2.24万
依托单位：
Ariake 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：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650192/
关键词：
Shock Vortex interaction Generation of Shocklet Shadowgraph Stereo Aero acoustics 渦輪空力音衝撃波と渦の干渉

项目摘要

The present study is concerned with the interaction between a high-speed vortex ring and a shock wave or a solid body. The flow fields induced by these interactions have been observed through flow visualizations. The side views are visualized by using a usual shadowgraph system, and the oblique views are by a stereo shadowgraph system. It gives perception of depth as stereoscopic vision. The brief conclusions for the observed flow fields are as follows.1) A vortex ring passing over a small solid sphere : After emitting from the shock tube, the shock wave spherically expands and collides with the front of the sphere. The weak reflected shock wave travels upstream as a spherical shock wave. It is initially regular reflection form, but soon becomes mach reflection form. As the vortex ring approaches the sphere, the wall vortices are induced on the sphere, and grow into a strong vortex ring. Shock waves are newly produced between the vortex core and the wall vortices. The produced shock waves interact with the vortices, and create the surface shock between the two vortex rings. The two vortex rings interact with each other, and the strong acoustic waves are emitted.2) The interactions between a shock wave and a vortex ring : After coming into a head-on collision with a vortex ring, the shock wave is divided into two waves, passing through the outside of the vortex ring and the inside of it. These two shock waves are joined with the shock wave refracted into the vortex core. As the shock wave leaves the vortex core reflected shock waves are produced. The produced shock and the distorted shock are the origins of the sound waves generated by the interaction of the shock wave and the vortex.

本研究涉及高速涡环与冲击波或固体之间的相互作用。通过流动可视化观察了这些相互作用引起的流场。侧视图通过使用常用的阴影图系统来可视化，而斜视图则通过立体阴影图系统来可视化。它以立体视觉的形式提供深度感知。观测到的流场的简要结论如下： 1）涡环经过小固体球体：激波从激波管发射后，呈球状膨胀并与球体正面碰撞。微弱的反射冲击波以球形冲击波的形式向上游传播。最初是正反射形式，但很快就变成马赫反射形式。当涡环接近球体时，球体上会诱发壁涡，并发展成强大的涡环。涡核和壁涡之间新产生冲击波。产生的激波与涡流相互作用，并在两个涡环之间产生表面激波。两个涡环相互作用，发出强烈的声波。 2）激波与涡环的相互作用：与涡环正面碰撞后，激波被分成两部分波，穿过涡环的外部和内部。这两个冲击波与折射到涡核中的冲击波汇合在一起。当冲击波离开涡核时，会产生反射冲击波。产生的冲击波和扭曲的冲击波是冲击波与涡流相互作用产生声波的根源。