气液耦合激振与超声空化数值模拟运动学分析

提出了一种将外加气体与液压油结合起来的气液耦合激振方式,通过控制气脉冲与液压油形成的空化泡发生生长和破灭,从而产生空化作用对液压系统内部污染物进行分散与剥离;开发了以气液耦合波动为激振方式的气液激振试验系统,建立了波动发生器作用下的气泡运动学方程;数值模拟了波动发生器与超声波作用下空化泡的运动学过程,并进行了对比分析,发现低频的波动发生器作为激振源使气泡产生的空化作用是显著的,为气液耦合激振作用下气泡空化过程的可控性研究提供了部分理论依据。

Kinematic Analysis of Numerical Simulation Between Gas-liquid Coupling Excitation and Ultrasonic Cavitation

A gas-liquid coupling exciting way is proposed and the gas-liquid excitation testing system with variable frequency is developed. By controlling the cavitation action of air bubble from pulse generation, we can disperse pollutants attached to the inner wall of the pipe in hydraulic system. The kinematics equation of air bubble is established and the numerical simulations are carried out to reveal kinematics process of air bubble resulted from ultrasonic and pulse generator. Some comparisons on cavitation process between ultrasonic and pulse generator are studied, which indicates that the effect of cavitation resulted from the pulse generator served as the excitation source with a lower frequency is significant. Some factors affecting the cavitation process are presented. This study provides a new method for the online cleaning of the complex hydraulic system and obtains some theoretical basis of the new gas-liquid coupling excitation.