Richtmyer-Meshkov不稳定性（RMI）及其诱导的湍流混合是天体物理、武器内爆、惯性约束聚变（ICF）等问题中常见的现象，激波的往复冲击是影响流场结构和混合区宽度增长的关键因素。前人的研究侧重于各控制参数对混合区宽度增长的影响和二次冲击非线性阶段混合区所致流动结构变化。考虑到ICF等问题中的密度比都较高，本项目将以高密度比平面RMI为对象，从湍流场结构、尺度、能量输运出发，研究激波往复冲击对RMI湍流混合的影响及影响机制。主要内容为：（1）研究激波冲击RMI湍流混合区（多介质湍流场）的精细物理过程。重点关注湍流强度、湍流尺度等统计量；（2）分析激波冲击对涡量和湍动能输运的影响，考察激波增强湍流强度的机制；（3）探索激波过后湍流结构演化，挖掘其与混合区宽度增长的内在联系。通过此项研究，将加深对该科学问题的认识，为发展和改进湍流混合模型、混合区宽度增长模型打下基础。

The Richtmyer-Meshkov instability (RMI) is a common phenomenon in astrophysics, implosions of weapons and inertial confined fussion (ICF), in which reshock is of great importrance for the development of flow structures and mixing-zone width. Previous researches in this field mainly concentrated on the two topics: the parameteric study of the growth of mixing-zone width, and the deformation of flow structures because of the reshocks in the nonlinear stage of RMI. Since the density ratio in industrial projects can be very high，our research will be on the influence of reshocks in the RMI turbulent mixing under high density ratio, emphasizing on the structures, the length scale and energy transport of turbulence. The detailed items that will be included are as follows: (1)the physical process during the interactions between reshocks and the mixing zone, e.g. the turbulent density, turbulent length scales will be discussed, (2) the mechanism under the influence by the reshocks on the mixing zone, e.g. the budget of vorticity and turbulent kinetic energy(TKE), and the mechanism of TKE amplification, and (3) exploring the evolutions of turbulent structures and its inherent relationship with the growth of mixing-zone width. This project will deepen our knowledge in this specific issue, contributing the improvement of turbulent mixing models and analytical models of mixing-zone width.