| 叶片进口边对微型高速离心泵性能的影响 |
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| 引用本文： | 李强,李森,燕浩,王道明,夏胜生.叶片进口边对微型高速离心泵性能的影响[J].排灌机械工程学报,2019,37(7):587-592. |
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| 作者姓名： | 李强 李森 燕浩 王道明 夏胜生 |
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| 作者单位： | 合肥工业大学机械工程学院, 安徽 合肥 230009 |
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| 摘 要： | 为研究叶片进口边形状对微型高速离心式冷却水泵性能的影响,在保证叶片进口断面面积相等的基础上,设计了3种不同叶片进口形式,即外凹型、半凸型、基础型.采用SST k-ω湍流模型对泵的水力特性以及压力脉动进行数值计算,将结果与试验值进行对比分析.结果表明:仿真结果较为准确地预测了泵的水力性能,具有可行性;3种方案在远离扩压管的叶轮流道内均存在旋涡;与基础型相比,外凹型方案的扬程和效率有明显提高,并且高效区范围最宽;外凹型方案叶片进口边和出口附近的湍动能分布较好、叶轮出口圆周速度最高;3种方案蜗壳内压力脉动幅值出现在叶频及其倍频处,距隔舌位置越远,脉动幅值越低.采用外凹型方案叶片能减小脉动幅值,利于泵稳定运行.研究结果为微型高速离心泵优化设计提供一定的参考.
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| 关 键 词： | 微型高速离心泵 叶片进口 水力性能 压力脉动 |
| 收稿时间： | 2017-08-20 |
Influence of blade leading edge shape on performance of micro-high-speed centrifugal pump |
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| LI Qiang,LI Sen,YAN Hao,WANG Daoming,XIA Shengsheng.Influence of blade leading edge shape on performance of micro-high-speed centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2019,37(7):587-592. |
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| Authors: | LI Qiang LI Sen YAN Hao WANG Daoming XIA Shengsheng |
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| Institution: | School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China |
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| Abstract: | Three types of blade leading edge shapes, namely basic plan, i.e. the edge is convex towards impeller eye like ordinary centrifugal pump impellers, semi-convex and semi-concave types, were proposed based on the same cross-sectional area at the edge to investigate their influences on performance of a micro-high-speed centrifugal cooling pump. The hydraulic performance and pressure pulsation of the pump were calculated numerically by making use of the SST k-ω turbulence model, and the performance was analyzed comparatively against the corresponding data tested. The results indicated that the simulated hydraulic performance is in good agreement with the tested values and the numerical method and flow model adopted are applicable to the pump. In addition, there are vortices in the impeller passages which are far from the volute diffuser in three plans. Compared with the basic plan, both the head and the efficiency are improved but also the efficiency curve is the most flatty around the best efficiency point in the semi-concave plan. The turbulent kinetic energy distribution near the blade leading and trailing edges is more satisfactory, and the highest circumferential component of absolute velocity at the impeller exit is observed, too. The peak pressure pulsation amplitudes in the volute appear at blade passing frequency and its multipliers, and they decay with increasing distance to the volute tongue in three plans. In the semi-concave plan, however, the peak pulsation amplitudes have reduced even more, exhibiting a favorable condition to stable operations for the pump. These results can provide reference for optimal design of micro-high-speed centrifugal pumps. |
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| Keywords: | micro-high-speed centrifugal pump blade inlet hydraulic performance pressure pulsation |
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