一个用于界面不稳定性实验研究的竖式激波管

A Vertical Shock Tube for Experimental Studies on Interfacial Instability

研制了一个可用于气-气界面Rayleigh-Taylor(RT)不稳定性、气-液界面Richtmyer-Meshkov(RM)不稳定性、气-液界面RT和RM耦合不稳定性实验的竖式激波管装置,配备了相应的光学电学测量系统,给出了装置的主要技术参数,以及典型实验的压力-时间曲线。利用这套实验装置,可以精确地控制不稳定性的初始扰动界面,观测记录界面演化发展全过程。

A new vertical shock tube was developed in order to investigate different stages of the development of hydrodynamic interfacial instability. The versatile shock tube permits the execution of three kinds of experiments on the turbulent mixing of fluids induced by the （1） Richtmyer-Meshkov instability at the gas-gas interface（initial perturbations are imposed on a thin nitrocellulose membrane）, （2） Rayleigh-Taylor instability at the gas-liquid interface（acceleration of the contact boundary of different density fluids g1≤2 ×10^4 m/s^2 ）, and （3） combined Rayleigh-Taylor and Richtmyer-Meshkov instability at the gas-liquid interface （the first shock wave Mach number ranges from 1.05 to 2.5）. The main benefits of such a facility are that it allows, first, to perform multiple experiments of interfacial instability and,second,to measure different transition phases from the beginning to the fully developed turbulent mixing stages.