Shock tube experiments of Richtmyer-Meshkov turbulence with reshock

Shock-driven turbulence may arise when a shock wave interacts multiple times with an interface separating two fluids of different densities and is important in many applications such as inertial confinement fusion. In this work, we perform Richtmyer-Meshkov experiments in a vertical shock tube containing a light fluid (air) sitting on top of a heavy fluid (SF6), and in which an initial single mode perturbation is imposed by a controlled flapping motion. A shock wave traveling from air to SF6 interacts a first time with the interface before reflecting off the bottom of the shock tube to interact with the interface a second time. Simultaneous planar laser-induced fluorescence and particle image velocimetry measurements are taken for three different shock Mach numbers (1.1 < Ms < 1.5), which allows us to access both the density and velocity fields. The high repetition rate of the experiments allows us to obtain second-order turbulence statistics, which are used to compare to and validate a variable-density turbulence model (BHR).