Shock-Induced Gas Mixing: A Study of the Richtmyer-Meshkov Instability in a Converging Geometry

What is it about?

This paper investigates how shock waves interact with a perturbed gas interface in a converging test section, leading to the Richtmyer-Meshkov Instability (RMI). Using both numerical simulations (OpenFOAM) and experiments (shock tube with Schlieren imaging), the study examines how different shock speeds (30m/s, 55m/s, and 80m/s) affect interface growth, circulation, and stabilization effects. The results show that stronger shocks lead to greater initial instability growth, but a convergent geometry introduces pressure gradients that eventually slow and reverse the perturbations. The findings contribute to understanding RMI in non-planar geometries, with relevance for high-speed flows, detonation engines, and astrophysical mixing.

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Why is it important?

This paper advances the understanding of Richtmyer-Meshkov Instability (RMI) in converging geometries, which is critical for applications in detonation engines, high-speed flows, and astrophysics. By combining experiments and simulations, it provides insight into how shock waves enhance mixing in compressible flows, a key factor in improving fuel-oxidizer mixing in propulsion systems and understanding fluid instabilities in inertial confinement fusion. The study also highlights the effects of geometric constraints on instability evolution, offering valuable data for refining turbulence models and improving the efficiency of high-speed combustion and shock-driven mixing processes.