CAREER: Shock-Tube Investigation of the Richtmyer-Meshkov Instability and Integration of Classroom Lectures and Computer and Laboratory Activities

摘要：提案号：CTS-9734384主要研究者：Bonazza这是一项职业奖，旨在进行实验研究在强冲击波加速下（大气中高达M = 4）流体界面不稳定性的演变。实验将在一个新的垂直方形大（25 × 25厘米）横截面激波管中进行。对于入射激波马赫数的几个值，将研究具有不同密度比的界面的时间演化（在早期、线性和后期非线性阶段）。连续的（重力分层）和不连续的（基于膜的）界面都将被研究。对界面演化的研究（特别强调其扰动和厚度的增长率）将基于高空间分辨率，对界面的平面和垂直截面进行定量成像。诊断技术将包括平面激光诱导荧光（PLIF）和瑞利散射，两者都将与脉冲ND:YAG激光器实现。这是流体力学中一个尚未解决的重要问题。它与超新星核心的翻转、工业环境中的反应性和非反应性混合过程以及惯性约束聚变实验中微靶的激光内爆有关。

ABSTRACT Proposal Number: CTS-9734384 Principle Investigator: Bonazza This is a Career Award to conduct experiments to study the evolution of the instability developing at a fluid interface accelerated by strong shock-waves (up to M = 4 in atmospheric air). The experiments will be carried out in a new vertical, square shocktube of large (25 x 25 cm) cross section. The time evolution (at both the early, linear and late, non-linear stages) of interfaces with various density ratios will be studied, for several values of the incident shock's Mach number. Both continuous (gravitationally stratified) and discontinuous (membrane-based) interfaces will be studied. The study of the evolution of the interface (with particular emphasis placed on the growth rates of its perturbations and thickness) will be based on high spatial resolution, quantitative imaging of planar, vertical cross sections of the interface. Diagnostic techniques will include planar laser induced fluorescence (PLIF) and Rayleigh scattering, both to be implemented with a pulsed ND:YAG laser. This topic represents an important unresolved problem in fluid mechanics. It is related to the overturn of supernova cores, reactive and non-reactive mixing processes in industrial settings and laser-implosion of microtargets in inertial-confinement fusion experiments.