不同叶片包角离心泵空化振动和噪声特性  

Characteristics of cavitation vibration and noise in centrifugal pumps with different vane wrap angles

作　　者：王勇[1,2] 刘厚林[1] 袁寿其[1] 刘东喜[1] 王健[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]江苏振华泵业制造有限公司,江苏泰州225500

出　　处：《排灌机械工程学报》2013年第5期390-393,400,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51239005;51079062;51179075);江苏高校优势学科建设工程项目;江苏省博士后科研资助计划项目(1202076C)

摘　　要：为研究叶轮叶片包角对离心泵空化诱导振动噪声的影响,以1台单级单吸离心泵为研究对象,保持泵体和叶轮其他几何参数不变,将叶片包角从115°改为110°,120°和125°.在离心泵闭式试验台上测量了不同叶片包角模型泵在不同装置空化余量时的振动和噪声信号,并对信号进行处理和分析.试验结果表明:叶片包角变化对离心泵设计工况下空化性能的影响无明显规律,存在1个最优值;随着叶片包角的增大,各测点加速度传感器测得振动强度的变化规律各不相同,出口法兰测点的振动强度相对最小,振动强度均在1.0 m/s2以下;随着叶片包角的增大,模型泵在无空化状态下运行时,噪声信号轴频峰值减小,叶频峰值变化复杂;空化初生和发展时,轴频峰值均呈先增加后降低的趋势,1 750～2 250 Hz频段的能量峰值随空化程度的加剧先增大后减小.In order to identify effects of vane wrap angle on the cavitation induced vibration and noise of centrifugal pumps,a single-stage,end-suction centrifugal pump was chosen as the experimental model,in which the vane wrap angles were 110°,115°,120° and 125°,respectively,while the rest geometric parameter of the pump kept unchanged.The cavitation induced vibration and noise signals of the pump with different vane wrap angles were measured under various net positive suction heads availa-ble by using a closed-loop centrifugal pump test rig,and then the signals were processed and analyzed.The experimental results showed that the vane wrap angle affects the pump cavitation performance without a clear regularity,but there exists an optimal angle indeed.With increasing wrap angle,the vibration intensities picked up at the four monitoring points don′t show a consistent pattern;however,the lowest intensity is founded at the discharge nozzle flange where all the intensity is below 1.0 m/s2.With increasing wrap angle,the peak values of noise signal at shaft rotating frequency decrease,but those at the blade passing frequency change in complicated manner under non-cavitating condition.During both cavitation inception and development stage,the peak values of noise signal at the shaft rotating frequency always increase initially and then drop off.Furthermore,the peak values of the energy at 1 750-2 250 Hz also show the same pattern with exacerbation of cavitation.

关 键 词：离心泵 叶片包角 空化 振动 噪声 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]