液压油箱内气泡流动观测及气泡分离方法  

Observation of bubble flow in hydraulic reservoir and bubble separation method

作　　者：冀宏[1,2] 孙东宁[1,2] 王金林[1,2] 张继铭[1,2] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省液压气动工程技术研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2015年第4期46-50,173,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51075194);甘肃省科技支撑计划(1011GKCA041)

摘　　要：针对液压油箱内气泡流动的现象,搭建气泡流动可视化试验系统,观察回油管出口附近气泡的流入和液压泵吸油管处气泡的吸入过程,获得气泡分布规律.利用Fluent中的欧拉-欧拉多相流模型,对液压油箱内流场进行气液两相流三维数值计算.基于气泡流动可视化试验结果和气液两相流的流动特性,提出两种实现气泡快速分离的方案.研究表明:系统回油管中油液携带直径大小不同的气泡进入到油箱内,快速弥散于整个油箱油液中;较大气泡能够快速上浮、逸出液面,直径较小的气泡随液流被液压泵吸入;在油液流入油箱前,通过改变油液的流态,形成旋转流或紊态流,可以使气泡从油液中快速分离.Aimed at the phenomenon of bubble flow in hydraulic reservoir, a visualization test system of bubble flow was set up. The intake process of bubbles near the outlet of the oil return pipe and at the suction pipe of the hydraulic pump was observed and the distribution pattern of bubbles in there was obtained. Three-dimensional computation of gas-liquid two-phase flow field in hydraulic reservoir was conducted with Eulerian-Eulerian multi-phase flow model in software Fluent. Based on the result obtained by the vigualization test and flow characteristics of gas-liquid two-phase flow, two options for rapid separation of bubbles were proposed. The research result showed that oil in the return pipe of the system would carry bubbles of different size into the hydraulic reservoir and quickly disperse throughout the whole reservoir. The larger bubbles could promptly float up and escape from the oil while the smaller ones would be sucked into the hydraulic pump along with the oil flow. The bubbles mixed in the oil could effectively be separated by means of altering the flow pattern and generating swirl flow or turbulent flow before oil flowing into the hydraulic reservoir.

关 键 词：液压油箱 气泡流动 分离方法 流动可视化试验 Fluent仿真 

分 类 号：TH137[机械工程—机械制造及自动化]