复合材料边界附近空泡动力学特性研究

The experimental investigation of bubble dynamics near the composite plates

该文对复合材料壁面附近空泡动力学特性开展了试验研究,综合研究了边界材料参数(惯性系数、阻尼系数和刚度系数)、空泡形态和溃灭射流方向之间的关系,测量了空泡非球形溃灭作用下复合材料板的动态响应过程。研究结果表明:在复合材料板附近,空泡会形成射流形、类球形和分裂形三种形态,且空泡形态与复合材料板的材料属性和空泡初始位置紧密相关。初始位置和最大半径相同的两个空泡分别在不同铺层数的复合材料附近振荡时会产生截然相反的运动方向。并且通过研究复合材料板的动态响应过程发现,当空泡体积最小时,其运动方向总是与复合材料板的中心挠度保持同相。

The objective of this paper is to apply the experimental method to investigate the bubble dynamics near the composite plates.The relationship is evaluated between the physical characteristics of composite plate (inertial,damping,and stiffness coefficients),bubble shapes,and the direction of the jet,as well as the the dynamic responses of the composite plate under the effect of the non-spherical bubble collapse.The results show that three typical bubble shapes are founded near the composite plates,namely,jet-like,near-spherical,and splitting ones,which are closely with the material properties of the plates and the stand-off distance of the bubble.Furthermore,two bubbles withsame maximum radius and stand-off distance presents distinctly opposite direction of the motion near the two plates with different laminating layers.And the mid-span deflection of the composite plates is found to always stay in phase with the bubble motion when bubble volume is the minimum value.