
The Effect of Splitter Blades on the Solid-liquid Performance of Low Specific Speed Centrifugal Pump
Yue ZHOU, Wen-wu SONG, Ke SU, Qiang DENG, Jian - wei SHI
The Effect of Splitter Blades on the Solid-liquid Performance of Low Specific Speed Centrifugal Pump
Low specific speed centrifugal pumps are widely used in water conservancy, agriculture and industry. They are a kind of small flow and high head pumps. There is widespread sedimentation in rivers in our country, and the existence of solid particles will have a great impact on the flow components of centrifugal pumps. Under the solid-liquid two-phase condition, the setting of splitter blades can not only improve the performance of the centrifugal pump, but also its internal flow field to make its operation more stable and enhance the ability to transport two-phase media. When the particle size is within 0.5 mm, the head and efficiency of the low specific speed centrifugal pump with splitter blades may increase with the increase in particle diameter due to the flocculation of sediment. Under the solid-liquid two-phase condition, the abrasion of the middle and rear part of the suction surface of the centrifugal pump impeller blade is the most serious and is mainly caused by large-size particles.
splitter blade / particle diameter / low specific speed centrifugal pump {{custom_keyword}} /
Tab.1 The basic design parameters表1 基本设计参数 |
参 数 | 数 值 |
---|---|
流量Q/(m3·h-1) | 60 |
扬程H/m | 50 |
转速n/(r·min-1) | 2 900 |
叶轮进口直径D 1/mm 叶轮出口直径D 2/mm | 60 190 |
叶片总数Z | 10 |
Tab.2 Test of grid independence表2 网格无关性检验 |
网格方案 | 无分流叶片模型 | 有分流叶片模型 | ||||
---|---|---|---|---|---|---|
网格数量/万个 | 扬程H/ m | 效率η/ % | 网格数量/万个 | 扬程H/ m | 效率η/ % | |
A | 112.4 | 48.13 | 83.44 | 111.2 | 51.60 | 80.15 |
B | 152.3 | 48.69 | 84.15 | 181.2 | 53.46 | 84.77 |
C | 275.1 | 48.71 | 84.63 | 281.3 | 53.58 | 85.38 |
Tab.3 Two grid schemes for blade models表3 两种叶片模型网格方案 |
过流部件 | 无分流叶片模型 网格数量/个 | 有分流叶片模型 网格数量/个 |
---|---|---|
进口段 | 129 708 | 129 514 |
叶轮 | 752 500 | 727 765 |
蜗壳 | 404 573 | 718 905 |
出口段 总网格数 | 236 255 1 523 036 | 236 123 1 812 307 |
Tab.4 Changes in the external characteristics of the centrifugal pump after adding 0.1 mm particles表4 加入0.1 mm颗粒后离心泵外特性变化情况 |
设计工况 | 效率η/% | 扬程H/m | ||
---|---|---|---|---|
工作 条件 | 无分流 叶片 | 有分流 叶片 | 无分流 叶片 | 有分流 叶片 |
清水 | 84.15 | 84.77 | 48.69 | 53.46 |
两相 | 46.93 | 54.74 | 26.92 | 37.63 |
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