Experimental Study Of The Plane Weak Shock Loading Spherical Bubble Under The Rm Instability Evolution

The experimental investigation of the interaction of a planar weak shock with an isolated gas bubble is of special significance in the serial study of Richtmyer-Meshkov instability: the interface of gas bubble has typical three dimensional characteristic and large initial distortions. It helps to understand the mechanism of Richtmyer-Meshkov instability process better and verify the numerical work.This dissertation adopts high-speed diagnostic technique and smog particle method to study the evolution of the light gas bubble and heavy gas bubble in the experiments.The research in this dissertation focused on the following aspects:1) Great efforts have been done on the smog particle tracing method. The tracing methods utilized in the light gas bubble experiment and the heavy one have been resolved. The results show that the usage of the smog particle tracing method can meet the demands of the experiment, and this is also the first time to introduce the smog particle tracing method into this series of experiments.2) Great efforts have been done on the formation of the spherical interface. The soap bubble solution which can meet the demands of experiments has been compounded. The soap bubble formed by the solution can accommodate the test gas contaminated by the smog particles and does not disrupt quickly.3) Light gas bubble and heavy gas bubble are studied via a high speed camera and the usage of smog particle tracing method. For each case, the geometrical features of the evolutions have been observed; and we have also observed the shape of the vortex ring in the light gas bubble case under weak shocks for the first time.4) Quantitative measurements of the experimental data have been done, and that the growth rate of the dimensionless total length in the light gas bubble experiment is maily related to the Mach number is finally proposed.5) An equation which agrees well with experimental datas has been proposed to describe the development about the height of the downstream vortex ring which has not been investigated before.6) The distribution of the displacement for the light gas bubble has been analyzed by using the correlation method; and the results agree quite well with the theoretical analysis.7) The movement of the soap bubble film has been interpreted by the theory of Cumulative Jet-flow. To conclude, an effort has been made to present a new experimental method in the study of the shock/bubble interaction and to gain several quantitave parameters for spherical interfaces. The analysis of present work is depend little on reference, the valid of it should be verified by more related work.