摘要
高速射流冲击会造成严重的结构损伤。在射流冲击平板的初始阶段,流体的可压缩性起主导作用。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性性板的压力分布,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,使其同样适用弹性板。研究表明:刚性板中心附近会产生约1/5冲击区域的负压区,自由液面变形使冲击脉宽和冲量明显增大弹性振动对冲击压力峰值基本无影响,但弹性振动可极大改变冲击压力分布,并能有效抑制负压区的产生。
The problem of jet impact on panels has been extensively concerned because collision between compressible jet and panels can cause severe structural damages. The compressibility of liquids dominates in the initial stage of collision. Considering the compressibility and free liquid surface deformation, doubly asymptotic approximation was improved to simulate the pressure distribution of rigid panels. The numerical results were in good agreement with those of the previous studied. Then, the method was combined with FE method to solve fluid-structure interaction problems, it successfully applied to elastic panels. The results showed that a one-fifth area of negative pressure is found around the center of rigid panels, and free liquid surface deformation makes pulse width and impulse increase significantly; the elastic vibration has no influence on the peak of pressure, but it can greatly change the pressure distribution and suppress the negative pressure area effectively.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第3期178-181,187,共5页
Journal of Vibration and Shock
基金
国防基础科研项目(B2420110011)
中央高校基本业务费(HEUCF120114)
关键词
射流冲击
双渐近法
流固耦合
自由液面变形
弹性振动
collision
doubly asymptotic approximation
fluid-structure interaction
free liquid surface deformation
elastic vibration
