高比转数双吸离心泵叶轮切割内部流场数值模拟  

Numerical Simulation of Interior Flow Field for Impeller Trimming of High Specific Speed Double-suction Centrifugal Pump

作　　者：李万军[1] 刘德顺[1] 金永平[2] 

机构地区：[1]湖南科技大学先进矿山装备教育部工程研究中心,湖南湘潭411201 [2]中南大学机电工程学院,湖南长沙410083

出　　处：《水电能源科学》2013年第8期144-148,共5页Water Resources and Power

基　　金：湖南省产学研结合技术创新工程计划基金资助项目(2010XK6066);湖南省自然科学省市联合基金资助重点项目(11JJ8005);湖南科技大学研究生创新基金资助项目(S110110)

摘　　要：为深入分析叶轮切割对高比转数双吸离心泵内部流动状况及性能的影响,采用数值方法对三台高比转数双吸离心泵进行了叶轮切割研究,对每台泵所装叶轮均进行4次切割;预测得到了泵的H-Q、η-Q、P-Q特性曲线与内部流场压力、速度等参数的分布云图及其随叶轮切割的变化情况,根据性能预测结果得到了最优工况下叶轮的切割指数。结果表明,当叶轮逐步切割时,泵的流量、扬程、轴功率均逐步降低;切割量较小时,泵的效率基本不变;随着切割量的增大,泵的效率开始下降,当切割量达到15%时效率下降明显;随着叶轮直径的逐步减小,泵内部压力场及速度场分布不均匀性增加;由数值计算所求得的切割指数与传统切割公式中的切割指数存在不一致性。In order to study the effect of impeller trimming on the high specific speed double-suction centrifugal pump＇s per formance, three pumps are adopted and a series of impeller trimming tests are carried out based on numerical simulation method. Furthermore, each pump＇s impeller is trimmed four times. The distribution cloud picture of characteristic curves of H-Q, η-Q, P-Q and the internal pressure and velocity, and its variation with the impeller trimming are predicted. Based on the performance prediction results, the trimming index of the impeller is obtained under the optimal operating condi tion. The results show that discharge, head and shaft power of pump gradually fall with the trimming impeller; the effi ciency of pump keep the same when the impeller reduction limited, and it reduces with increase of the impeller trimming; when the trimming value get to 15 percent, there is a sharp decrease in efficiency of pump; the internal pressure and ve- locity distribution become nowuniform with decrease of the impeller diameter; the impeller trimming index obtained by the numerical simulation is not consistent with the traditional formula of impeller trimming.

关 键 词：叶轮切割 高比转数 双吸离心泵 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]