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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.

本文研究的是高速涡旋环与激波或固体之间的相互作用。这些相互作用引起的流场已经通过流动可视化观察到。侧视图通过使用通常的阴影系统来可视化，而斜视图则通过立体阴影系统来可视化。它以立体视觉来感知深度。对观测到的流场的简要结论如下：1)经过小实心球体的涡流环：激波从激波管发出后，呈球形膨胀并与球体前端碰撞。弱反射激波以球形激波的形式向上游传播。它最初是规则反射形式，但很快就变成了马赫反射形式。当涡流环接近球体时，在球体上产生壁面涡，形成强涡流环。激波是在涡核和壁面涡之间新产生的。产生的激波与涡旋相互作用，在两个涡旋环之间产生表面激波。两个涡流环相互作用，发出强声波。2)激波与涡环的相互作用：激波与涡环正面碰撞后，分为两波，分别穿过涡环的外侧和内侧。这两个激波与折射到涡核的激波结合在一起。激波离开旋涡核心时产生反射激波。产生激波和畸变激波是激波与涡旋相互作用产生声波的来源。