后导叶对喷水推进轴流泵性能的影响

通过三维紊流数值计算和模型试验研究后导叶对轴流泵整体性能的影响.计算和泵试验表明,基于RNG k-ε紊流模型的定常流动分析能有效预测高效区内的泵特性.叶轮和导叶之间的轴向间隙为0.1 D时,后导叶对叶轮性能几乎没有影响,后导叶主要以对叶轮出口水流的旋转动能的回收和水力损失的形式对泵的特性产生影响.通过后导叶设计工况的选择,可适应不同的应用要求,实现叶轮和后导叶优化配置的目的.

Influence of Outlet Guide Vanes upon Performances of Waterjet Axial-Flow Pump

With the use of three-dimensional turbulence numerical simulation and model test,the influence of the outlet guide vanes (OGV) on the overall performances of the axial-flow pump is studied.The computational and experimental results indicate that the steady numerical simulation based on the RNG k- turbulence model can effectively predict the pump performances at the design flow rate. When the axial clearance between the impeller and the OGV is greater than 0.1D,the OGV almost has no influence on the performance of the impeller. The existence of OGV will recycle the rotating kinetic energy of the impeller outlet, and cause hydraulic losses at the same time. By selecting the design operation point of the OGV,the configuration between the impeller and the OGV can be optimized in order to satisfy user's requirements.