螺旋离心泵叶轮域流体能量损失研究  

Energy Loss Analysis of Impeller Flow of Screw Centrifugal Pump

作　　者：李仁年[1] 申正精[1] 韩伟[1] 权辉[1] 李琪飞[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《农业机械学报》2014年第9期125-130,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51079066)

摘　　要：以螺旋离心泵为研究对象,采用计算流体力学方法,对叶轮内部流场进行数值计算,分析了叶片工作面和背面轮毂、轮缘处的压强和速度分布。定义Rothalpy值作为能量损失定量评价的指标,对输送介质为清水和固相体积分数为20%、颗粒粒径为0.076 mm的固液两相含沙水在螺旋离心泵叶轮域的能量变化进行了分析,得出叶轮不同位置处能量变化规律。结果表明:叶轮螺旋段头部是整个叶轮域能量转换的过渡区域,螺旋段是叶轮域流体介质能量增加的主要区域,螺旋段中部的壁面摩擦损失对螺旋段做功能力有一定影响,液流在离心段能量损失最大;较输送清水,当输送固相体积分数为20%、颗粒粒径为0.076 mm的含沙水时,叶轮做功能力有所提高,在叶轮出口处,两类流体介质的能量趋于均匀。The flow regime in screw centrifugal pump was simulated by the method of computational fluid dynamics （CFD）, which can acquire the distribution of the pressure and relative velocity on the work side and back side of blade. The Rothalpy value along the streamlines of blade was used as a quantitative index of energy loss. The energy loss within the impeller field was analyzed from the perspective of energy loss when the transmission medium is pure water and solid-liquid two phase flow, in which the concentration of sand is 20% and the diameter of sand is 0. 076 mm. The result shows that the front of impeller is a transition region of energy conversion, the screw part is the main region of energy increase, and the friction loss at the middle of screw part has an effect on the working capacity of screw part Compared with pure water transmission medium, the working capacity of the impeller shows some improvement when the transmission medium is the solid-liquid two phase flow. And the energy of the two kind transmission media tends to become average at the outlet of impeller.

关 键 词：螺旋离心泵 叶轮 固液两相流 能量损失 

分 类 号：TH311[机械工程—机械制造及自动化]