【摘要】 研究了同向稀疏波和激波诱导的轻/重单模界面不稳定性的演化规律。在稀疏波作用下，轻/重界面扰动增长呈现稳定振荡行为，即扰动增长处于Rayleigh-Taylor (RT)稳定状态。基于推导的稀疏波诱导一维界面运动理论，考虑了变加速度和变密度效应，修正了经典的RT稳定模型，能够对RT稳定振荡过程进行较好的预测。进一步研究了激波在RT稳定振荡的不同阶段进行二次冲击的扰动增长行为，发现可以利用两种波系在界面上沉积涡量方向相同或相反来调控界面扰动增长率。此外，在同向稀疏波和激波的作用下，界面演化会从Rayleigh-Taylor (RT)稳定状态转变为Richtmyer-Meshkov (RM)不稳定状态，这与反向稀疏波和激波作用单模界面扰动增长行为不同。激波冲击之后的扰动线性增长率近似满足叠加原理，而非线性增长规律也可以采用经典的模型来预测。更多还原

【Abstract】 Developments of a single-mode light/heavy interface accelerated by co-directional rarefaction and shock waves were investigated. Induced by the rarefaction waves, the light/heavy perturbation amplitude experiences an oscillatory growth, which is referred to as the Rayleigh-Taylor(RT) stability. Based on the one-dimensional theory on interface movement induced by rarefaction waves, the classical RT stability model was modified by additionally considering the variations of acceleration and density. The modified model can well predict the oscillatory growth behavior of the perturbation amplitude. In addition, the amplitude growth after the shock impact at different moments was studied. It was found that it is feasible to manipulate the perturbation growth through the shock impact, depending upon the sign of vorticity deposited by the rarefaction waves and shock waves. Moreover, the interface evolution after the shock impact changes from the RT stable state to the Richmyer-Meshkov(RM) unstable state, which is different from the situation when the perturbation is accelerated by counter-directional rarefaction and shock waves, in which the RT behavior will be kept after the shock impact. In the present work, the linear and nonlinear growth rates after the shock impact can respectively be predicted by the linear superimposition principle and classical nonlinear model.更多还原