减压条件下竖直边界附近气泡动力学行为数值与实验研究

为深入探究气泡与边界的相互作用规律,设计了减压条件下气泡动力学实验方法,并基于势流理论,建立气泡与壁面相互作用的三维数值模型。将计算值与实验结果进行对比发现,二者吻合较好,数值模型可以较好地模拟气泡在第一周期与边界的相互作用。此外,开展减压电火花实验产生大尺度的气泡,研究气泡第一周期以后气泡与壁面的相互作用,得到计及浮力影响的气泡射流后形成环状气泡的运动形态,以及气泡射流角度随距离参数和浮力参数的变化规律,为气泡对结构的毁伤研究提供可行的数值和实验方法。

Experimental and Numerical Study of Dynamic Behavior of Bubble around Vertical Boundary under Hypobaric Condition

In order to research the interaction between near-field bubble and nearby boundaries, a multi-function experimental apparatus operating under reduced air pressure is designed. A three-dimensional numerical model is established based on the potential flow theory. By comparison of experimental and simulated results, the numerical model is found to have good accuracy in simulating the bubble oscillation in the first period. Besides, the motion of bubble near a vertical wall after the first period is studied experimentally. The toroidal motion of the bubble after being penetrated by the jet is studied under different buoyancy effects; the variation of the jet angle with the standoff distance is shown. The work provides reference for relevant numerical and experimental studies in structural damage induced by bubbles.