轴流泵装置封闭式进水池水力性能模拟与验证

Simulation and Verification of Hydraulic Performance in the Enclosed Suction Sump of the Axial Flow Pumping System

为分析轴流泵装置封闭式进水池内部流动特性及性能预测,基于商用CFD(Computation Fluid Dynamic)软件,运用N-S方程和标准k-ε紊流模型对泵装置进行全流场数值模拟研究。共计算22~40 kg/s流量范围内的7个工况点,与泵装置模型试验展开对比。研究表明小流量、设计流量工况两者吻合较好,大流量工况封闭式进水池内部流动复杂,两者差异较大。数值模拟和模型试验两者在喇叭管后上方相同位置均捕捉到明显附壁涡,验证了数值模拟的有效性和可靠性。

The internal flow characteristics and performance prediction of the axial flow pumping system is simulated by using N-S equation combined with k-εstandard turbulence model through the commercial Computation Fluid Dynamic(CFD)applications.The experimental test data of pumping system is obtained from the flow range of 22~40 kg/s,and 7 flow values are selected.The results show that a good agree‐ment is achieved between the small flow condition and the design flow conditions.The large flow condition is complicated under the enclosed suction sump,in which a considerable difference with experimental data exists.Meanwhile,the results indicate that the obvious wall vortex is captured at the same position above the horn tube,which verifies the effectiveness and reliability of the numerical simulations.