大气对水面空泡溃灭影响的研究

建立了无界大气流场和有界水流场综合作用下的两相球空泡动力学模型,并基于这个模型研究了大气密度和流动对水面空泡溃灭压力的影响机理。结果表明,当空泡收缩到较小时,空泡的非线性动力学行为可以使大气密度或流动对空泡溃灭压力的影响迅速增大,大气密度越小,溃灭压力越大。

Research on the influence of the atmosphere to the collapse of the water-exit cavity

The water-exit cavity is simplified as the problem of the spherical cavity near the water surface, and the two-phase bubble dynamical model under the comprehensive effect of the unbounded atmosphere flow field and the bounded water flow field was established. The influence mechanism of the atmosphere den-sity and flow to the collapse pressure of the water-exit cavity was also studied based this model. The research shows that when the cavity contracts to some small value, the nonlinear dynamic behavior of the cavity can make the perturbation of the atmosphere density and pressure amplified rapidly. Especially on the same initial conditions, the small perturbation of the atmosphere density can lead to an obvious increase of the col-lapse pressure at the same moment.