水泵叶轮的流动叠加设计方法与CFD仿真

叶轮叶片是复杂的空间曲面体,它直接影响到水泵的水力性能及运行稳定性.发动机水泵叶轮流动叠加设计是通过分析流体的流动规律,按其流动轨迹进行叶轮设计,将流体在离心水泵内的流动看作叶轮静止时的轴向和径向流动和叶轮旋转时的周向流动的叠加,从而用绕角流动和源环流的流体流动规律设计出叶轮的轴面轮廓和叶片骨线.通过CFD(Computational Fluid Dynamics)仿真,可以证明该方法从结构上避免了流体流动过程中由于空间的相对不均而造成的压力不均,减轻了回流、二次流,相应地减少能量的损失,提高水泵的效率.

Flow superposition design method and CFD simulation for the impeller of water pump

The blade of impeller, which is complicated spatial curved volume, directly influences on its hydraulic performance and running stability. Basing on the flow law of liquid, flow superposition design for the impeller of engine water pump was applied following to the flow trail. The flow of liquid in water pump was considered as the superposition of axial and radial flow at motionless and the peripheral flow at rotating, so its meridian contour and blade type could be designed with corner flow law and source-vortex flow law. According to the computational fluid dynamics (CFD)  simulation result, this method can avoid uneven pressure because of uneven spatial liquid flowing, and reduce back flow and secondary flow, accordingly reduce energy loss and increase pump efficiency.