带分流叶片的离心泵叶轮内部流场的PIV测量与数值模拟

用PIV技术和工程上广泛应用的k-ε标准两方程模型,对不同工况带分流叶片的离心式水泵叶轮内部流场进行了测量和计算模拟。通过试验测试和模拟计算,获得了不同工况下叶轮内的流速分布规律,揭示了叶轮内流动的非对称性、长叶片吸力面进口附近有回流、各种工况下分流叶片前缘入口稍后吸力侧均存在一个高流速区、分流叶片改善出口速度分布、随着流量增加叶轮内相对速度的大小增大明显等对带分流叶片离心泵性能有直接影响的多种流动现象。

PIV MEASUREMENTS AND NUMERICAL SIMULATIONS OF FLOW IN CENTRIFUGAL PUMP IMPELLERS WITH SPLITTING VANES

PIV technology and numerical simulations are employed to study the flow in centrifugal pump impellers with splitting vanes under different working states. Through experimental tests and numerical simulations, the flow fields in impellers are obtained for various working states. The results exhibit some basic flow characteristics in impellers: the asymmetry of flow in impellers; backflow occurs in the inlet suction side of long vanes; high speed region exists in the immediate region behind the shroud of splitting vanes; the outlet velocity profile is impr oved by splitting vanes; relative velocity increases evidently with the increase of flow rate. All these flow phenomena directly affect the performance of pumps.