泵作透平振动噪声机理分析与试验  

Mechanism analysis of vibration and noise for centrifugal pump working as turbine

作　　者：代翠[1] 董亮[1] 孔繁余[1] 冯子政 柏宇星 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业工程学报》2014年第15期114-119,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金(51309119);国家科技支撑计划(2013BAF01B02;2013BAK06B02);江苏省科技支撑计划(BE2012131);江苏省研究生科研创新计划项目(CXZZ12_0680);江苏大学高级人才科研启动基金(12JDG082);江苏高校优势学科建设工程项目

摘　　要：为了深入了解泵作透平不同流量不同转速下的振动噪声情况,在离心泵作透平开式试验台上,基于INV3020C数据采集系统和透平测试系统建立了泵作透平振动噪声试验测试系统,实现了性能参数和振动噪声信号的同步采集。为研究泵反转作透平振动和水动力激励诱发的进出口噪声特性,以一台单级单吸离心泵作透平为研究对象,利用加速度传感器和水听器测量了泵作透平在不同转速及流量下的振动和噪声。试验结果表明:随着转速的增加,泵作透平的扬程增大,高效区范围增加,效率有所提高且最高效率点向大流量偏移,同时,泵体加速度的总有效值和进出口噪声总声压级也随转速的增加而增加;随流量的增加,各测点的振动加速度和声压级逐渐升高;泵体的振动强度高于其他测点,各测点的振动强度主要反映于水平向;相同流量下出口噪声的声压级高于进口。该研究可为泵作透平减振降噪提供参考。Centrifugal pumps as turbine （PAT） are widely used in the petroleum and chemical industry with reasonable efficiency and low cost investment. And it represents the primary source of vibration and acoustic energy in industrial pipeline system. The amount of emitted energy may vary significantly between different designs and it is generally not well known. In order to better understand the flow-induced vibration and noise characteristics of centrifugal pump in reversible turbine operation, a single grade end suction centrifugal pump was chosen as research object. The fluid flows into the PAT through the outlet in pump mode and flows out through the inlet. A synchronous acquisition of performance parameters and vibration and noise signals were realized on the basis of INV3020C data acquisition system and performance test system in an open test loop. The liquid is pressurized through the booster pump, and then the high pressure liquid impacts the turbine impeller to make it rotate. The dynamometer consumes and measures the turbine’s energy. The operating condition was adjusted by regulating the frequency of frequency converter to change the booster pump’s capacity. Experimental studies on the vibration characteristic at different monitoring positions and acoustic characteristic at the upstream and downstream of PAT were carried out on the test bench, during which the rule and frequency characteristics of vibration and noise versus rotating speed were investigated at variable and constant flow rates. The vibration and flow noise signals were collected within 30 s using acceleration sensors and hydrophone at a sampling frequency of 20 kHz. The vibration measurements were performed on the bearing, pump casing, the inlet and outlet flange and the pump foot in horizontal and vertical directions with acceleration sensors （INV9822A）. The noise was measured with flush-mounted hydrophones （ST70） located at 260 mm upstream and 400 mm downstream of PAT, which were four times of pipe diameters. The signals were a

关 键 词：离心泵 透平 试验 噪声 振动 

分 类 号：TH311[机械工程—机械制造及自动化]