基于运行稳定性的离心泵导叶安装位置优化试验与分析  

Optimal experiment and analysis on installation position for diffuser of centrifugal pump based on operating stability

作　　者：刘厚林[1] 明加意 肖佳伟[1] 董亮[1] 白羽 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]沈阳鼓风机集团股份有限公司,沈阳110869

出　　处：《农业工程学报》2016年第7期93-99,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划(2013BAK06B02);浙江省重大科技专项重大工业项目(2014C01004-1);过程装备与控制工程四川省高校重点实验室开放基金资助项目(GK201403);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为提高导叶式离心泵的运行稳定性,探寻径向导叶相对隔舌的最佳安装位置,该文通过数值模拟确定了某型号单级单吸导叶式离心泵的3种典型导叶安装位置,并通过试验对3种安装位置下的外特性、压力脉动和振动特性进行了测试。对比分析了外特性曲线、压力脉动幅值和频域特性、振动幅值和频域特性。研究结果表明,蜗壳隔舌处于导叶出口流道中间位置时,离心泵水力性能最好,效率相对于其他2个位置最多提高2个百分点;测点在3个方向上的振动加速度幅值均处于较低水平,但是会增大蜗壳扩散段在大流量时的压力脉动幅值,最多高出2.25 k Pa。由于径向导叶的存在,2倍轴频和3倍轴频是压力脉动的主要激励频率;2倍轴频与6倍轴频是振动加速度的主要激励频率。蜗壳扩散段压力脉动幅值随着流量增加先减小后增大,在0.6倍工况达到最低值。导叶安装位置对压力脉动频域分布规律和振动加速度频谱特性的影响较小,相同工况下,测点的压力脉动频域分布规律和振动加速度频谱特性基本相同。因此,该研究为径向导叶的合理布置提供了参考。The hydraulic performances, pressure pulsations and vibrations of a single-stage single-suction centrifugal pump with radial diffuser at 3 different installation positions were tested for the purpose of improving the operating stability and exploring the best installation position. The experiment was conducted in a closed test platform. Numerical simulations were taken to find 3 typical positions. Through the simulation performance curve, the obvious difference occurred in 3 positions, i.e. the positions with the angle between volute tongue and radical diffuser blade of 0°, 20° and 40°. In order to provide 3 different positions, a unique radial diffuser with many positioning holes was made. Through changing the installation position of radial diffuser, 3 different testing pumps were obtained. The test measured the hydraulic performance of the pump, the pressure pulsation of the volute outlet section and the vibrations of the whole pump. The flow was measured by the turbine flow meter. The head and the power were calculated with the data gotten by the pressure transmitters in the inlet and outlet and the torque meter respectively. The pressure pulsation of the volute outlet section was measured by a high-frequency pressure transmitter. The vibration sensors were arranged in the pump, with 2 sensors monitoring the x direction and y direction respectively in the pump cover and 1 sensor monitoring the z direction in the bearing body. All the data were collected simultaneously. The sampling frequency was 10.24 kHz and the sampling time was 30 s. Through testing the pumps with 3 different radial diffuser installation positions, the data of the pressure and vibration acceleration were obtained, the performance curves, pressure pulsation amplitude, pressure pulsation characteristics in time domain and frequency domain, and the vibration amplitude and vibration characteristics in frequency domain were analyzed. The experimental results showed that when the volute tongue was set at the middle of the radial diffuser chan

关 键 词：离心泵 振动 压力 径向导叶 

分 类 号：TH311[机械工程—机械制造及自动化]