The interface instability and turbulent mixing induced by the impact of a Mach reflection wave configuration have attracted considerable interests because of its practical importance in engineering applications including inertial confinement fusion (ICF) and supersonic combustion. For the shock refraction process at the early stage of interface instability, an analytical model describing the triple-shock refraction is developed, which accurately predicts both the wave configurations as well as circulation deposition and velocity perturbation. Combined with experiments and numerical simulation, the underlying physical mechanism of interface instability induced by a Mach reflection wave configuration is uncovered for the first time. For the turbulent mixing occurs at the later stage of interface instability, Mach reflection wave configurations are successfully generated in a vertical shock tube, and the velocity field and density field of turbulent mixing zone are measured using simultaneous particle-image velocimetry and laser-induced fluorescence (PIV-PLIF). The mean and fluctuating quantities of turbulent field are calculated by the ensemble averaging method. Quantitative statistical data of turbulent mixing induced by a Mach reflection wave configuration are acquired, and the characteristics of turbulent mixing, including turbulence energy spectrum, turbulence transition criteria and Reynolds stress, are examined.
 

Richtmyer-Meshkov instability;Mach reflection;Turbulent mixing