立式轴流泵装置内部流动特性数值分析

Numerical Analysis of Internal Flow Characteristics of Vertical Axial Flow Pump

水泵流量是影响水泵运行效率和能量变化的重要参数之一,为明确轴流泵装置内各过流结构的能量变化规律,基于雷诺时均Navier-Stokes(RANS)控制方程和RNG k-ε湍流模型,对轴流泵内部流动情况进行数值模拟,分析各特征工况(小流量工况0.3 Q_(bep)、最优流量工况1.0 Q_(bep)和大流量工况1.2 Q_(bep))下装置全流道的压力和速度分布规律,探讨不同工况时各过流断面的能量变化。结果表明,随着流量的增加,进水流道水力损失逐渐增大,导叶体内水力损失随着流量的增大先减小后上升;弯管段水力损失随流量的增大逐渐减小;虹吸式出水流道水力损失随流量的增大逐渐上升。

The pump flow rate is one of the important parameters affecting the operation efficiency and energy change of the pump.In order to clarify the energy change law of each flow structure in the axial flow pump device,based on the Reynolds-averaged Navier-Stokes(RANS)control equation and RNG k-εturbulence model,the internal flow of the axial flow pump was numerically simulated.The pressure and velocity distribution law of the whole flow channel of the device under different characteristic conditions(0.3 Q_(bep) under small flow condition,1.0 Q_(bep) under optimal flow condition and 1.2 Q_(bep) under large flow condition)were analyzed,and the energy change of each flow section under different conditions was discussed.It is concluded that with the increase of flow rate,the hydraulic loss in the inlet channel increases gradually,and the hydraulic loss in the guide vane decreases first and then increases with the increase of flow rate,the hydraulic loss of elbow section decreases with the increase of flow rate;the hydraulic loss of siphon outlet gradually increases with the increase of flow rate.