可压缩流体射流冲击平板的压力特性研究

高速射流冲击会造成严重的结构损伤，因此射流冲击问题越来越受到我国海军重视。在射流冲击平板的初始阶段，流体的可压缩性起着主导作用。计及流体的可压缩性和自由液面的变形，通过对双渐进法进行改进，数值模拟射流冲击时刚性板的压力分布，数值结果与已有文献值吻合良好。将此方法与有限元耦合，实现冲击流固耦合问题的求解，使其同样适用于弹性板。研究表明：刚性板中心附近将会产生约为1/5冲击区域的负压区，且自由液面的变形使得冲击脉宽和冲量明显增大。弹性振动对冲击压力的峰值基本没有影响，但弹性振动极大地改变了冲击压力的分布，并能有效的抑制负压区的产生。

Research on pressure characteristics of panels subjected to collision of compressible jet

The problem of jet impact on panels has been extensively concerned because collision between compressible jet and panels can cause severely structural damage. The compressibility of liquids dominates on the initial stage of collision. Considering the compressibility and free surface deformation, doubly asymptotic approximation was improved to simulate the pressure distribution of rigid panels. The numerical results are in good agreement with the previous work. Then the method was coupled with FEM method to solve fluid-structure interaction problems, which can successfully applied for elastic panels. The results show that one fifth negative pressure area is founded around the center of rigid panels, and free surface deformation makes pulse width and impulse increased significantly. The elastic vibration has no influence on the peak of pressure, but it can greatly change the pressure distribution, which would restrain negative pressure effectively.