摘要
为研究叶片不等间距排布对串并联离心泵压力脉动的影响,基于转子自动平衡理论建立5种不等距叶轮模型.对比分析了不同方案下该泵的性能及压力脉动特性,以提高串并联离心泵的运行稳定性.结果表明:并联或串联运行时,在较小的最小角间距θmin时,扬程和效率都有所下降,在最小角间距为56°或58°时,相比于叶片等间距(原始模型)布置时效率有所增大,其中效率的最大值都出现于最小角间距为56°时;不等距方案在435Hz即1.5倍叶频处出现了新的脉动能量幅值,该能量幅值随着最小角间距的增大而逐渐减小,改善了脉动能量的集中分布;通过对蜗壳周向监测点压力脉动及主频脉动能量幅值的对比,在最小角间距为56°时压力脉动幅值分布更均匀稳定,能量分布更加合理.
Five kinds of impeller models with unequal blade pitch were established based on automatic balancing theory of rotor-bearing systems to explore the influence of unequal blade pitch on pressure fluctuation in a series-parallel centrifugal pump.Specially,the performance and pressure fluctuation characteristics of the pumps with these impellers were compared and analyzed to improve the operational stability of the pump.The results show that the head and efficiency of the pump decrease as θ min gets small regardless of running in parallel or in series.When θ min is equal to 56° or 58°,the efficiency is higher than that with equal blade pitch,particularly,the best efficiency appears at θ min =56°.An additional fluctuation energy amplitude peak occurs at 435 Hz,i.e.,1.5 times the blade passing frequency in unequal blade pitch cases,and the amplitude decreases gradually with increasing θ min .As a result,the concentrated distribution of pulsating energy has been mitigated.The distribution of pressure fluctuation amplitude is more uniform and stable,and the energy distribution is more reasonable at θ min =56° in terms of comparison of pressure pulsation characteristics and pulsation energy amplitudes in the dominant frequencies at the monitoring points positioned along the circumference of the volute.
作者
柴立平
俞嘉枫
李跃
燕浩
曹林松
CHAI Liping;YU Jiafeng;LI Yue;YAN Hao;CAO Linsong(School of Mechanical Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2019年第9期752-757,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
合肥工业大学博士学位人员专项基金资助项目(JZ2015HGBZ0469,JZ2015HGBZ0128)
关键词
串并联离心泵
不等距叶片
最小角间距
压力脉动
能量分布
series-parallel centrifugal pump
unequal spacing blade
minimum angle distance
pressure pulsation
energy distribution
作者简介
第一作者简介:柴立平(1969—),男,安徽滁州人,教授(clppump@263.net),主要从事化工泵设计及试验研究;通信作者简介:俞嘉枫(1992-),男,浙江诸暨人,硕士研究生(756763828@qq.com),主要从事流体机械研究.
