镂空式整流底坎对侧向进水泵站前池流态的影响

Influence of Hollow Rectifying Sill on Flow Pattern in Forebay of Side-inlet Pumping Station

为了改善侧向进水泵站进水流态,采用CFX软件对侧向进水泵站前池流态进行了数值模拟,并结合物理模型试验,研究了在前池入口处设置不同孔高比镂空式整流底坎对水流流态的影响。结果表明,在加设七种不同孔高比镂空整流底坎后,流态方面,底坎孔高比为0(无孔整流坎)时,相比不设整流底坎时进水流道前的漩涡区大幅减小,在引河处仍存在低速回流区;镂空式整流底坎设置后,进水前池回流区明显减小,当孔高比达到0.6时,漩涡和回流区基本消失,进入进水池水流无明显偏流,流态相比较好;流速均匀度方面,进口断面轴向流速均匀度随着孔高比的增加先增大后减小,当孔高比为0.6时,进水池入口处流速均匀度达到了74.27%,相比于孔高比为0时提高了6.77%,即当孔高比为0.6时流速均匀度较好。

In order to improve inlet flow pattern in side-inlet form of pump station,CFX software,combined with physical model test,was used to study the influence on flow pattern with different hole-to-height ratio hollow sill on the flow pattern.The results show that after installing seven different hole-to-height ratio rectification sills in the forebay,when the hole-to-height ratio was 0(non-porous sill),the vortex area of low velocity at the baffle of intake channel was reduced and the flow pattern was improved compared with no rectifying sill.However,there is still a small range of low-speed backflow area in the diversion channel.After the rectification sill was set up,the backflow area of the forebay decreased obviously.When the ratio of hole height reached 0.6,the vortex and backflow area basically disappeared without obvious deviation,and the flow pattern was improved.As for the velocity uniformity,the axial velocity uniformity of the inlet section increased first,then decreased with the increase of hole-to-height ratio.When the hole-to-height ratio was 0.6,the velocity uniformity of the inlet sump reaches 74.27%,which was 6.77%higher than that when the hole-to-height ratio was 0.It could be concluded that when the ratio of hole height was 0.6,the velocity uniformity was better.