【摘要】 针对平面激波绕过圆柱产生的扰动激波与N₂/SF₆轻重气体界面相互作用产生的Richtmyer-Meshkov不稳定问题进行了数值模拟，研究了SF₆中不同大小颗粒对不稳定发展的影响规律。计算结果表明，对于5μm、20μm、50μm三种不同尺寸的颗粒，反射激波与轻重气体界面作用的时间和位置不同，50μm的颗粒中界面演化更充分，后期湍流化程度更高；比较反射激波与界面作用形成的涡旋结构的发展演化，SF₆气体中会形成较多的尖钉、气泡结构，尖钉“腿部”由于剪切形成KH不稳定涡旋，最终形成大小不等的涡旋结构，转捩为湍流；5μm的小颗粒由于惯性小，跟随流体的运动能力更强，后期颗粒群演化出尖钉气泡结构，50μm的颗粒惯性大，与流体运动差别大，颗粒空间分布与气体界面不稳定发展有较大不同。更多还原

【Abstract】 The Richtmyer-Meshkov instability of perturbed shock waves, generated by a planar shock wave passing around a cylinder, interacting with N₂/SF₆light and heavy gas interfaces has been numerically investigated, from which the effect of particles with different sizes in SF₆ on the development of RM instability is explored. The results indicate that, for particles of all three different sizes（5 μm, 20 μm, and 50 μm）, the time and location of the interaction between the reflected shock wave and the light/heavy gas interface vary. The interface evolution of the 50 μm particles is more fully-developed, with a higher degree of turbulence in the late stage. Comparing the development of vortex structures formed by the interaction of the reflected shock wave and the interface, numerous spikes and bubble structures are formed in SF₆ gas. The legs of the spike undergo KH instability,eventually transitioning into turbulence. Due to the small inertia, the 5 μm particles follow the carrier fluid motion more quickly, evolving into spike/bubble structures in the late stage. In contrast, the 50 μm particles, with greater particle inertia, manifest substantial differences in motion from the fluid, exhibiting significant differences in spatial distribution from the unstable development of the gas interface.更多还原