有压进水池消涡导水锥研究

The Eddy-eliminating Method of Guide Cone in the Closed Sump

采用单因素比较法对封闭式进水池进行CFD数值模拟计算,在ω形后壁形状的基础上进行了三角形导水锥和传统型导水锥的消涡CFD数值计算。研究表明,ω形后壁形状与进水池内流线线型最为相符,三角形导水锥高度HZ=(0~0.407)DL,锥形高度的增加阻碍喇叭管进水;三角形导水锥底径BZ=(0.5~1.0)DL,增加底径一定程度上提高了水力性能。传统型导水锥底径BZ=(0.5~1.0)DL,底宽增加阻碍喇叭管进水。设计流量下,三角形导水锥与传统型导水锥对泵效率的影响较小,但从消除进水池底部附底涡效果来看,设置防涡导水锥是有必要的。

In order to explore the effect on eddy-eliminating method of guide cone in the closed sump,the simple factor analysis and CFD numerical simulation are applied to calculate the flow field of closed sump and select ω-shaped back wall. ω-shaped back wall is consistent with the stream line in the suction sump. On this basis,CFD numerical simulation is conducted with the eddy-eliminating of the triangle guide cone and traditional guide cone. The results show that,for eddy-eliminating measures,with the height of triangular guide cone from 0 to0.407 HZ/DL,the excessive triangle guide cone hinders water from entering the flared pipe. With the width of triangular guide cone from 0.5 to 1.0 BZ/DL,increasing width of triangular guide cone may increase the pumping hydraulic performance and pumping efficiency. However with the width of triangular guide cone from 0.5 to 1.0 BZ/DL,too broad traditional guide cone hinder water into the flared pipe. In the design discharge,whether triangle guide cone or traditional guide cone have a little effect on the efficiency of the pumping station. In terms of the eddy eliminating on the bottom of suction sump,it is necessary to set up guide cone.