| 基于不等距叶片的串并联泵压力脉动 |
| |
| 引用本文： | 柴立平,俞嘉枫,李跃,燕浩,曹林松.基于不等距叶片的串并联泵压力脉动[J].排灌机械工程学报,2019,37(9):752-757. |
| |
| 作者姓名： | 柴立平 俞嘉枫 李跃 燕浩 曹林松 |
| |
| 作者单位： | 1. 合肥工业大学机械工程学院, 安徽 合肥 230009; 2. 合肥工业大学汽车与交通工程学院, 安徽 合肥 230009 |
| |
| 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435 Hz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.
|
| 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 |
| 收稿时间： | 2017-09-27 |
Pressure pulsation characteristics in a series-parallel centrifugal pump with unequal blade pitch |
| |
| CHAI Liping,YU Jiafeng,LI Yue,YAN Hao,CAO Linsong.Pressure pulsation characteristics in a series-parallel centrifugal pump with unequal blade pitch[J].Journal of Drainage and Irrigation Machinery Engineering,2019,37(9):752-757. |
| |
| Authors: | CHAI Liping YU Jiafeng LI Yue YAN Hao CAO Linsong |
| |
| Institution: | 1. School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China; 2. School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei, Anhui 230009, China |
| |
| Abstract: | Five kinds of impeller models with unequal blade pitch are established based on automatic balancing theory of rotor-bearing systems to explore the influence of unequal pitch on pressure fluctuation in a series-parallel centrifugal pump. Specially, the performance and pressure fluctuation characteristics of the pumps with these impellers are compared and analyzed to improve the operational stability of the pump. The results show that the head and efficiency of the pump decrease as θmin gets small regardless of running in parallel or in series. When θmin is equal to 56° or 58°, the efficiency is higher than that with equal blade pitch; particularly, the best efficiency appears at θmin=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 θmin. As a result, the concentrated distribution of pulsating energy has been mitigated. The distribution of pressure fluctuation amplitude is more uniform and stable but also the energy distribution is more reasonable at θmin=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. |
| |
| Keywords: | series-parallel centrifugal pump unequal spacing blade minimum angle distance pressure pulsation energy distribution |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《排灌机械工程学报》浏览原始摘要信息 |
| 点击此处可从《排灌机械工程学报》下载免费的PDF全文 |
|
