As an important equipment in the field of fluid machinery,axial flow pump is widely used in many fields such as agricultural irrigation,urban drainage and industrial water supply.The hydraulic model designed according to the free vortex hypothesis often gives a large Vu2 value near the hub side,while the Vu2 value near the rim side is very small,so the root of runner blade is often twisted,which greatly affects the improvement of runner efficiency.Therefore,this paper proposes a circulation correction method based on Bezier curve to realize different circulation distribution forms by adjusting the coordinates of control points of Bezier curve.Based on the free vortex hypothesis,the circulation between hub and rim is non-uniformly distributed by this method,and the internal and external characteristics of the axial flow pump before and after optimization are compared.The results indicate that the efficiency of linear circulation at design point reaches 85.52%,which is 1.47%higher than that of free vortex design,and the vorticity intensity at runner outlet is obviously improved.In the nonlinear circulation correction,reducing the circulation near the hub side and increasing the circulation near the rim side can help improve the performance of the pump section.
关键词
轴流泵/优化设计/贝塞尔曲线/环量分布
Key words
axial flow pump/optimization design/Bezier curve/circulation distribution
维普
万方数据