The reflection and refraction of a curved shock front sliding over an air–water interface

IF 1.7 4区 工程技术 Q3 MECHANICS
R. Arun Kumar, G. Rajesh, G. Jagadeesh
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引用次数: 1

Abstract

The present study aims to investigate the reflection and refraction of a curved shock front as it slides along an air–water interface, using the time-resolved shadowgraph technique. The curved shock front is generated from a free-piston shock tube. The study successfully captured the propagation of a refracted shock wave in water along with that of the reflected shock wave in the air. The refracted shock moves much faster than the incident shock due to a higher acoustic speed in the water. It is seen that the reflected shock initially exhibits a regular reflection (RR), which then transitions to a Mach reflection (MR) as it propagates along the interface. As the shock wave propagates along the air–water interface, the incident shock wave angle with the interface keeps on increasing, leading to RR–MR transition. Shock polar analysis shows that as the Mach reflection structure propagates further along the interface, it transitions from a standard Mach reflection to a non-standard Mach reflection. It is seen that the distance the shock wave propagates along the interface before it transitions from RR to MR increases with the increase in the interface distance (distance between the water surface and the shock tube axis). It is also found that the reflection surface (water or solid) does not seem to have a significant effect on the shock transition criterion, especially the distance at which the shock wave transitions from RR to MR.

Abstract Image

在空气-水界面上滑动的弯曲激波锋面的反射和折射
本研究的目的是研究弯曲激波锋面沿空气-水界面滑动时的反射和折射,使用时间分辨阴影图技术。弯曲激波前是由自由活塞激波管产生的。该研究成功地捕获了折射激波在水中的传播以及反射激波在空气中的传播。折射激波的运动速度比入射激波快得多,这是由于水中的声速更高。可以看出,反射激波最初表现为规则反射(RR),然后在沿界面传播时转变为马赫反射(MR)。当激波沿气-水界面传播时,入射激波与界面的夹角不断增大,导致RR-MR转变。激波极性分析表明,随着马赫反射结构沿界面的进一步传播,它从标准马赫反射过渡到非标准马赫反射。可以看出,激波在从RR向MR过渡之前沿界面传播的距离随着界面距离(水面与激波管轴线之间的距离)的增加而增加。还发现反射面(水或固体)似乎对激波过渡判据没有显著影响,特别是激波从RR到MR的过渡距离。
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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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