叶片包角对离心泵流动诱导振动噪声的影响  

Effects of vane wrap angle on flow induced vibration and noise of centrifugal pumps

作　　者：王勇[1] 刘厚林[1] 刘东喜[1] 王健[1] 吴贤芳[1] 

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》2013年第1期72-77,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家杰出青年基金项目(50825902);国家自然基金项目(51239005;51079062;51179075);国家科技支撑计划项目(2011BAF14B03);江苏省博士后科研资助计划项目(1202076C);江苏高校优势学科建设工程项目;江苏大学高级人才基金资助项目(12JDG044)

摘　　要：为研究叶片包角对离心泵流动诱导振动噪声的影响,以一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°分别改为110°、120°和125°。基于离心泵流动诱导振动噪声的试验测试系统,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流量下的振动和噪声信号并对其进行了处理和分析。试验结果表明:模型泵内部流动诱导的振动对泵体的影响最大,包角为125°时模型泵的振动强度相对较弱;随着叶片包角的增加,泵进口法兰测点a1和泵出口法兰测点a2处振动强度大致呈先增加后降低的趋势,泵体测点a3和泵脚测点a4处的振动强度无明显变化规律;在不同流量工况下,随着叶片包角的增加,模型泵噪声信号的轴频峰值呈先增加后减小的变化趋势,而叶频能量峰值变化较为复杂。该研究可为低振动低噪声离心泵的水力优化设计提供参考。In order to better understand the effects of vane wrap angle on flow induced vibration and noise of centrifugal pumps, a single grade end suction centrifugal pump is chosen as research object. The vane wrap angle was varied from 115°to 110°, 120°and 125°, while the volute and other geometric parameters were kept constant. The vibration and noise signal of the model pump were acquired via PXI-4472B dynamic data acquisition system developed by NI Company in United States and measured respectively by the 4 acceleration transducers MA352A60 made in the PBC Company in USA with a range of 5-70 kHz, and one hydrophone with a range of 50-70 kHz and a received sound pressure sensitivity of -204 dB. The hydrophone measure point was located in pump outlet pipe and the 4 acceleration transducers were placed on the suction flange a1, discharge flange a2, the pump casing a3 and the pump foot a4 respectively. Based on the pump testing system and the virtual instrument data acquisition system, the pump flow-induced vibration and noise testing system was established, which realized the synchronous collection of the pump characteristics and the vibration and noise signal. In addition, the system improved testing accuracy. On the centrifugal pump closed experimental rig, the performance characteristics （flow-head curves and flow-efficiency curves）, the flow-induced vibration and noise signals of model pump with different vane wrap angle in the full flow range were measured and analyzed. Experimental results show that there was an optimal value of vane wrap angle for pump to obtain maximum efficiency under design condition, because the unsteady flow （take-off flow and vortex） decreased with the increase of vane wrap angle, but the blade length growth, friction loss increased. 115°was found as the optimal vane wrap angle for the model pump in this investigation. The vibration intensity of model pump with different vane wrap angle at four measurement points was nearly unchanged or with a little fluctuation under small flo

关 键 词：离心泵 试验 振动 噪声 包角 

分 类 号：TH311[机械工程—机械制造及自动化]