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排灌机械工程学报
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排灌机械工程学报  0, Vol. Issue (): 8-    DOI:
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
若干因素对混流泵水力性能的影响
常书平 等
Effects of some factors on hydrodynamic performance of mixed-flow pump
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摘要 为提高混流泵的水力性能,开展了叶顶间隙、叶轮叶片数、叶轮叶片安放角、壁面粗糙度和叶轮叶片厚度等因素对混流泵水力性能影响的数值研究。基于雷诺时均 (RANS)方程和剪切应力输运(SST)湍流模型,采用结构化网格技术,应用多重参考系 (MFR)方法对多个流量工况下混流泵内流场进行数值模拟。结果表明:混流泵的扬程、功率和效率都随叶顶间隙的增大而降低;通过叶片安放角的调整可实现泵最高效率点的偏移并改变高效区的范围;扬程和功率随叶轮叶片数的增加而增加的幅值渐小,叶轮叶片数过多或过少对混流泵效率都不利;泵效率随壁面粗糙度增加而显著下降;泵最高效率点随叶片厚度减薄而向大流量偏移,且最高效率有所提高。在满足制造工艺与安装要求的前提下,对影响混流泵水力性能的各因素进行优化选择可大大提高混流泵的水力性能。
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关键词混流泵   叶顶间隙   安放角   叶片数   粗糙度   厚度     
Abstract: In order to improve hydrodynamic performance of mixed-flow pump, numerical research on some factors influencing hydrodynamic performance of mixed-flow pump were carried out. The factors were the tip clearance, the rotor blade number, the rotor blade angle, the roughness, the rotor blade thickness. Internal flow field of mixed-flow pump, which was meshed by structured grids, was simulated at multi conditions by solving Reynolds-Averaged Navier-Stokes equations and shear stress transport turbulence model with multiple-reference- frame approach. The results show that the head, power and efficiency all decline with the tip clearance enhancing. The maximum efficiency can be elevated and the high efficiency zone can be enlarged by adjusting the rotor blade angle. The head and power increase with the rotor blade number increasing, but the head increasing amplitude is gradually smaller with the rotor blade number increasing. It's unfavorable as the rotor blade number too many or too few. The efficiency declines significantly with the roughness increasing. When the rotor blade become thinner, the maximum efficiency point moves to a little larger mass-flow-rate point, and a slightly increased efficiency value was gained. On premise of satisfying produce and installation requirements, optimal choices of these factors can greatly improve hydrodynamic performance of mixed-flow pump.
Key wordsmixed-flow pump   tip clearance   blade angle   blade number   roughness   thickness   
引用本文:   
. 若干因素对混流泵水力性能的影响[J]. 排灌机械工程学报, 0, (): 8-.
. Effects of some factors on hydrodynamic performance of mixed-flow pump[J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 8-.
 
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