混流泵叶轮和导叶数量匹配分析
- Title:
- Number Matching Analysis of Impeller and Guide Vane in a Mixed-flow Pump
- 关键词:
- font-size: 10pt; ">混流泵; 叶轮; 导叶; 匹配性
- Keywords:
-
mixed-flow pump
; font-size: 10pt; ">impeller; guide vane; matching
- 摘要:
-
叶轮和导叶数量的合理匹配是保证大型调水工程泵站和泵装置高效、稳定运行的重要因素。为了研究某混流泵叶轮与导叶数量匹配优化问题，采用计算流体力学方法，分别计算叶轮叶片数Z1和导叶叶片数Z2共12种匹配方案，每种方案均计算0.8Q0、 Q0和1.2Q0这3种流量，并通过模型试验验证了数值模拟结果的可靠性。结果表明：改变叶轮叶片数时，不同流量工况下 混流泵的水力性能差异较大，适当增加叶轮叶片数，会增加水泵的扬程、改善水泵的汽蚀性能，但是随之摩擦损失增大、效率有所下降，而且流量增大时这种差异越明显；在不同流量工况下，改变导叶叶片数对泵段水力损失的影响较为明显，选择合理的导叶叶片数对改善混流泵段的整体性能是有效的、可行的。
- Abstract:
-
Reasonable matching of the number of impeller and guide vane is an important factor to ensure the efficient and stable operation of pump station and pump device in large water diversion projects. In order to explore the matching relationship between impeller and guide vane of a mixed- flow pump, a total of 12 matching schemes of impeller blade number Z1 and guide vane number Z2 were calculated by computational fluid dynamics. For each scheme, three flow rates of 0.8Q0,Q0 and 1.2Q0 were calculated, and the reliability of the numerical simulation results was verified by model test. When the number of impeller blade was changed, the hydraulic performance of the mixed-flow pump varied greatly under different flow conditions. Appropriate increase in the number of impeller blade, the impeller head increased, and the impeller cavitation performance was improved. However, it would also increase the friction loss and decrease the efficiency, and the difference was more obvious with the increase of flow rate. Under different working conditions, influence of changing the blade number of guide vane on hydraulic loss of the pump section was obvious, and the selection of a reasonable blade number of guide vane was effective and feasible to improve the overall performance of the mixed-flow pump section.
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