单 位：
中国农业大学水利与土木工程学院;中国水利水电科学研究院天津水利电力机电研究所
关键词：
低扬程泵站;轴流泵装置;导流锥;进水池;水力性能
摘 要：
为了研究导流锥型式对低扬程泵站水力性能的影响,以新开河口泵站的低扬程轴流泵装置为例,设计了直线锥、双曲线锥、抛物线锥、圆弧锥和椭圆锥等5种导流锥型式,并采用CFD方法对轴流泵装置进行了全流道三维流场计算.研究发现,导流锥对泵站水力性能影响较大.5种型式导流锥均可消除进水池内附底涡.当采用直线锥、双曲线锥、抛物线锥和圆弧锥时,进水池均出现了1个侧壁涡和2个表面涡.而加设椭圆锥以后,池内只存在1个侧壁涡和1个表面涡,与未加导流锥相比减少了旋涡数量.不同导流锥对水力损失影响较大,采用椭圆锥所计算的水力损失最小,而其他导流锥方案的水力损失大于无导流锥方案.对出口流场均匀性进行比较,综合考虑轴向速度分布均匀度和速度加权平均角度等2个指标,椭圆锥的整流效果最好.最后对水泵装置效率进行分析,发现采用椭圆锥可显著提高水泵装置效率.
译 名：
Effects of guide cone configuration on hydraulic performance of low-head pumping station
作 者：
Zhou Peijian;Wang Fujun;Zhang Zhimin;College of Water Resources & Civil Engineering,China Agricultural University;Tianjin Institute of Hydroelectric and Power Research,China Institute of Water Resources and Hydropower Research;
关键词：
low-head pumping station;;axial pump system;;guide cone;;sump;;hydraulic performance
摘 要：
In order to investigate effects of guide cone on hydraulic performance of low-head pumping station,five different guide cone configurations,namely straight,hyperbolic,quadratic,arc and elliptical cones are designed for Xinkaihe Pumping Station. The 3D flow field in the flow passages accommodating an axial-flow pump in that station is simulated by employing CFD method. It is turned out that the guide cone has a large effect on flow pattern in the pump sump. All the guide cones can prevent the occurrence of the floor-attached vortices in the pump sump. For the straight,hyperbolic,parabolic and arc cones,one sidewall-attached vortex and two free surface vortices emerge. For elliptical cone,however,only one sidewall-attached vortex and a free surface vortex are identified. Comparing with the case without guide cone,the elliptical cone has reduced the number of vortices. Additionally,guide cones also have a remarked effect on hydraulic loss in the pump sump. The hydraulic loss is the minimum for the sump with elliptical cone,but the loss for the rest cones is larger than the one without guide cone. Comparing the flow at the outlet of sump across the configurations by means of the axial velocity uniformity and velocity-weighted average swirl angle,it was shown the elliptical cone has the best rectification effect on flow. Finally,the hydraulic efficiency was analyzed for the flow passages with various guide cones,and it was demonstrated that the elliptical cone can result in an improved hydraulic efficiency compared with the others.
