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

建议编号：CTS-9734384首席研究员：Bonazza这是一项职业奖，旨在进行实验，研究在强激波(大气中高达M=4)加速的流体界面上不稳定发展的演化。实验将在一种新的垂直方形大截面(25x25厘米)激波管中进行。对于几个入射激波马赫数的值，我们将研究不同密度比的界面的时间演化(早期、线性和晚期、非线性阶段)。我们将研究连续的(重力分层的)和不连续的(基于薄膜的)界面。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横截面进行定量成像。诊断技术将包括平面激光诱导荧光(PLIF)和瑞利散射，这两种技术都将使用脉冲NdYAG光来实现。这个主题代表了流体力学中一个重要的悬而未决的问题。它与超新星核心的颠覆、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目标的激光内爆有关。

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.