液压油箱中液压油掺混气泡的气液两相流研究

Gas-water Two-phase Flow of the Hydraulic Oil with Bubble in Hydraulic Oil Tank

利用欧拉-欧拉多相流模型,针对液压油箱中液压油掺混气泡进行气液两相流数值模拟仿真,对比分析在不同液压油动力粘度与不同气泡直径条件下气泡在液压油箱内的流动与分布规律。研究表明:气泡直径一定,随着油液动力粘度的增大,掺混在油液中的气泡上浮逸出的速度越慢;油液动力粘度一定,随着气泡直径的增大,直径较大的气泡快速上浮逸出,直径0.25～1mm的气泡上浮逸出速度变慢,进入液压系统参与工作,造成不利影响;并在此基础上对油箱结构进行优化改进,通过设置隔板,延长油液在油箱中的流动距离与时间,有利于掺混在油液中的气泡上浮逸出。

Analog simulation is carried out for the value of gas-water two-phase flow of the hydraulic oil with bubbles in hydraulic oil tank by making use of Euler-Euler of multiphase flow model,and the flowing and distribution rule of the bubble with different hydraulic oil dynamic viscosity and different bubble diameter conditions in the hydraulic oil tank.According to the research,When the diameter of the bubble is fixed,the floating and escaping speed of the bubble in the oil will be slower with the increasing of the oil fluid dynamic viscosity.When the oil fluid dynamic viscosity is fixed,the bubbles with relatively large diameter quickly float and escape with the increasing of the diameter of the bubbles,and the floating and escaping speed of the bubbles with the diameter of 0.25-1 mm slow and enter the hydraulic system to participate in the work to generate adverse effect.The oil structure is optimized based on this basis,setting baffle and prolonging the floating distance and time of oil fluid in the oil tank help the floating and escaping of the bubbles in the oil fluid.