文丘里管空化器内空泡动力学特性的数值模拟

研究了文丘里管空化发生器内空泡的成长、溃灭特性,根据基本的R-P空泡运动方程,考虑了液体粘性、表面张力和可压缩性等因素的影响,运用四阶Runge-Kutta法对空泡径向非线性运动方程进行求解,得到空泡径向演变过程以及溃灭压力的变化趋势.讨论了初始汽泡半径、入口压力和文丘里管的喉径比等因素对空泡演变过程的影响.结果表明,流体的可压缩性对空泡溃灭的影响最大;空化发生器结构参数以及操作参数均对空泡运动特性产生影响,从而影响空化强度.所得结果对空化流场中空化泡演变规律的研究以及水力空化发生器的设计具有指导意义.

Numerical simulation of babble dynamics in venturl cavitational reactor

Based on the Rayleigh-Plesset dynamic equation of cavitational bubble and then considered the effects of fluid viscosity,surface tension and compressibility,the growth and collapse of bubble in venturi cavitational reactor are studied,The fourth order Rung-kutta method is used to solve the nonlinear dynamic equations numerically,which obtains the radial evolution and pressure generated by bubble collapse.The effects of initial bubble radius,pressure inlet and venturi throat to pipe diameter ratio on bubble evolution and collapse pressure are discussed.Numerical simulation shows that compressibility of fluid affects the bubble behavior significantly rather than viscosity and surface tension.The operating parameters and geometric pa- rameters of cavitation reactor both affect bubble behavior,and hence change the intensity of cavitation.The results from this study cart make a direction for researching the evolution law of bubbles in cavitating flow,designing reasonable hydrodynamic cavitational reactor.