| 导叶参数对混流泵水阻系数及效率的影响 |
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| 引用本文： | 杨从新,杜媛英,黎义斌.导叶参数对混流泵水阻系数及效率的影响[J].排灌机械,2012(5):538-542. |
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| 作者姓名： | 杨从新 杜媛英 黎义斌 |
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| 作者单位： | 兰州理工大学能源与动力工程学院,甘肃兰州730050 |
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| 基金项目： | “十二五”国家重大装备计项目（00-318-06-04） |
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| 摘 要： | 以某混流泵为研究对象,基于Fluent软件,建立相对坐标系下的时均连续方程及N-S方程,并采用RNG k-ε湍流模型、非结构四面体网格和SIMPLEC算法对该混流泵内部三维流动进行数值模拟,在分析网格无关性的基础上,研究叶轮叶片和导叶叶片的静压及绝对速度分布规律,并对在不同的导叶数和不同导叶进口安放角下分别模拟了其在静态时的水阻系数和动态时的性能参数,发现在其他参数不变只改变导叶数时,导叶数为3时该混流泵水阻系数最低,导叶数为9时扬程和效率最高;在设计工况下其他参数保持不变只改变导叶进口安放角,冲角为0°时该混流泵的水阻系数最低,扬程和效率最高,但总体变化不明显.结果表明：在特殊应用环境下、为保证设计所要求效率的情况下,导叶数应尽量少;在设计混流泵的空间导叶时,导叶进口安放角在5°左右的范围内改变,混流泵的性能无明显变化.
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| 关 键 词： | 混流泵 水阻系数 导叶数 导叶进口安放角 数值模拟 |
Effects of guide vanes parameters on water resistance coefficient and efficiency of mixed-flow pump |
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| Yang Congxin,Du Yuanying,Li Yibin.Effects of guide vanes parameters on water resistance coefficient and efficiency of mixed-flow pump[J].Drainage and Irrigation Machinery,2012(5):538-542. |
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| Authors: | Yang Congxin Du Yuanying Li Yibin |
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| Institution: | (College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China) |
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| Abstract: | The numerical simulations of the three-dimensional flow inside a mixed-flow pump were done by using unstructured tetrahedral mesh and the SIMPLEC algorithm,which was employed in Flue-nt.The time-averaged continuity equation and the N-S equation as well as the RNG k-ε turbulence model in a relative coordinate system were used as the flow model in the pump.The static pressures and absolute velocity distribution on impeller blades and guide vanes were examined after the mesh size-independent was checked.The flow resistance coefficient across the pump was estimated with steady and unsteady head curves when the number of guide vanes and inlet angle of the guide vanes were subject to be changed.It was found that the lowest flow resistance coefficient was reached at three guide vanes,and the highest head and best efficiency were achieved at nine guide vanes while the rest geometrical parameter of the guide vanes remained unchanged.At a zero angle of attack the lowest flow resistance coefficient,highest head and best efficiency were obtained at the design condition when just the inlet angle of the guide vanes were altered.However,the coefficient,head and efficiency didn′t seem changed significantly.The results showed that the number of guide vanes should be as small as possible to meet the requirement on efficiency for a particular application.In addition the mixed-flow pump performance has no significant change when the inlet angle of guide vanes is changed by less than 5° for a diffuser casing. |
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| Keywords: | mixed-flow pump water resistance coefficient number of guide vane inlet angle of guide vane numerical simulation |
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