低比转速导叶式混流泵水力性能分析  

Analysis of hydraulic performances in a low specific speed mixed-flow pump with guide vanes

作　　者：易艳林 张志民[1] 王万鹏[1] 何磊 王武昌 YI Yanlin;ZHANG Zhimin;WANG Wanpeng;HE Lei;WANG Wuchang(China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院,北京100038

出　　处：《中国水利水电科学研究院学报》2021年第3期335-341,共7页Journal of China Institute of Water Resources and Hydropower Research

基　　金：中国水科院科研专项(HM0145B222019)。

摘　　要：为了研究低比转速导叶式混流泵的水力性能,本文基于三维湍流流动雷诺时均N-S方程及SST k-ω湍流模型对该泵内部三维流动进行定常数值计算。给定不同流量,分别计算分析混流泵的扬程、效率与流量的关系,预测水泵能量特性,并分析该混流泵在五个典型流量工况下各过流部件的水力损失及流场特性。结果表明,小流量工况,导叶区的流动分离及旋涡流动是造成导叶区及出口段水力损失占比较大的重要原因;大流量工况,叶片入口处的冲击现象是造成叶轮区水力损失占比较大的重要原因。In order to study the hydraulic performance of low specific speed mixed-flow pump with guide vanes,the inner flow of the pump was simulated based on the steady 3D turbulent Reynolds averaged N-S equations and SST k-ωturbulence model.The relationships of hydraulic head and efficiency with rate of flow are calculated to predict energy characteristic of the pump.The hydraulic loss of flowing parts and flow field characteristic under five typical conditions are given.The results indicate that under the condition of low flow rate(0.75Qd、0.9Qd),flow separation and vortex flow in guide vane area are the main causes of the large hydraulic loss in guide vane area and outlet.With the increase of flow rate(1.0Qd、1.15Qd、1.4Qd),the impact phenomenon of blade inlet is the main cause of the large hydraulic loss in impeller area.

关 键 词：低比转速导叶式混流泵 水力性能 流场分析 数值模拟 

分 类 号：TU991.35[建筑科学—市政工程]