摘要
为研究气液两相流对小流量工况下混流泵叶轮的影响,采用Euler-Euler非均相流模型,应用商业计算流体力学软件ANSYS CFX~模拟分析混流泵叶轮内的气液两相瞬态流动特性。结果表明,在一定含气率条件下,叶轮内的流体速度在小流量工况时受气相影响较大;不同流量工况时气相主要集中在靠近叶轮背面区域内;流量变小时,在叶轮入口到出口方向上由高扬程产生的压差作用是叶轮流道内气体体积分数变化的主要原因,且流量愈小其对叶轮进口处的气相体积分布影响越大。研究成果可以弥补混流泵理论研究的不足。
In order to study the impact of gas-liquid two phase flow on the mixed flow pump impeller under the condition of small flow rate,based on the Euler-Euler heterogeneous flow model,numerical simulation of gas-liquid two-phase transient flow characteristics in a mixed flow pump impeller was carried out by using the commercial computational fluid dynamics software ANSYS CFX~.The results show that the velocity of the fluid in the impeller was greatly influenced by the gas phase in the small flow rate condition under a certain volume fraction of gas conditions;At different flow rate conditions,the gas was mainly concentrated in the area near the back surface of the impeller;The pressure gradient caused by the high head in the impeller inlet to outlet direction was the main reason for the change of the gas volume fraction in the impeller runner under the conditions of small flow rate;In addition,the smaller the flow rate is,the greater the influence on the gas phase volume distribution at the impeller inlet is.The results of research can make up for the deficiency of the theoretical study of mixed flow pump.
出处
《水电能源科学》
北大核心
2017年第8期152-154,共3页
Water Resources and Power
基金
国家自然科学基金项目(51379179)
四川省科技计划项目(2017JY0048)
关键词
混流泵
叶轮
小流量
含气率
mixed flow pump
impeller
small flow rate
volume fraction of gas
