| 低比转数离心泵进口预旋的数值计算 |
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| 引用本文： | 施卫东,;李辉,;王川,;徐媛晖.低比转数离心泵进口预旋的数值计算[J].排灌机械,2014(8):652-657. |
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| 作者姓名： | 施卫东 ;李辉 ;王川 ;徐媛晖 |
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| 作者单位： | [1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013; [2]新界泵业集团股份有限公司,浙江温岭317525 |
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| 基金项目： | 国家自然科学基金资助项目（51279069）; 江苏省科技支撑计划项目（BE2012150） |
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| 摘 要： | 为研究预旋对泵性能的影响,基于欧拉方程和斯托道拉方法,采用径向前置导叶实现预旋,以CFD软件Fluent为平台,以单级低比转数离心泵为研究对象,改变前置导叶几何参数设计3组方案,通过对3组前置导叶预旋方案进行数值模拟,从内部流场和外特性分析预旋对离心泵无过载性能的影响.结果表明：从内流场上看,预旋越强,导叶出口圆周速度越大.若不考虑边壁影响,圆周速度沿径向由内到外呈增大趋势,沿流动方向,圆周速度略有减小,与速度矩保持定理有一定的偏差.从外特性上看,通过增加预旋获得了陡降的H-Q曲线及平坦的P-Q曲线,并且效率在小流量到额定流量附近还略有提高,因此,通过预旋实现全扬程无过载是可行的.
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| 关 键 词： | 低比转数泵 预旋 数值模拟 前置导叶 |
Numerical calculation of inlet prewhirl flow in low-specific-speed centrifugal pump |
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| Institution: | Shi Weidong, Li Hui , Wang Chuan , Xu Yuanhui ( 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Shimge Pump Ltd., Wenling, Zhejiang 317525, China) |
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| Abstract: | A single-stage low specific speed centrifugal pump was studied based on the Euler equation and Stodola method on the platform of Fluent considering the inlet prewhirl by using radial inlet guide vanes to study the influence of prewhirl on pump performance. The effect of prewhirl flow on non-overload performance of a centrifugal pump was analyzed through the internal flow field and external characteristic obtained from the numerical simulation of three schemes with different geometric parameters of inlet guide vanes. The results shows： the circumferential velocity at the exit of guide vanes increases with the enhancement of the inlet prewhirl. According to the internal flow field from inside to outside along the radial direction, the circumferential velocity shows the increasing trend and slightly reduces along flow direction without considering the effect of boundary which is different with VuR = constant. Sharp down head curves and fiat power curves can be obtained by the enhancement of the inlet prewhirl flow and the efficiency is improved slightly near the region from small flow rate to rated flow. Therefore, it is possible to realize the non-overload performance in the total head range by using prewhirl flow. |
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| Keywords: | low specific speed pump inlet prewhirl numerical simulation inlet guide vanes |
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