农业机械学报2017，Vol.48Issue(6)：88-93,137,7.DOI:10.6041/j.issn.1000-1298.2017.06.011
离心泵内空泡演化与其对振动的影响
Evolution of Cavitation Bubbles and Its Influence on Vibration in Centrifugal Pump
摘要
Abstract
Visual analysis illustrated the steady and rotating cavitation in a centrifugal pump at different flow rates.The cavity structures under different NPSH were captured and the cavity lengths,including the supercavity length were obtained.The corresponding vibrations of the volute and bearing were measured by using acceleration sensors.The influences of the cavity structures on the vibrations were analyzed.Experimental results showed that the vibration was increased when the cavitation occurred at the pressure side,especially when the supercavitation occurred.The cavitation at the suction side was usually thin and its influence on the vibration was relatively small.The growth rate of the cavity length at the pressure side was increased after the appearance of supercavitation.At the flow rates of 0.6Qd and 0.8Qd,the vibration turned from increase to decrease soon after the rotating cavitation appeared,and the ratios of the cavitation number to attack angle at the turning point were close to each other.And then the vibration was increased again when the stable cavitation occurred at the pressure side,and finally it was decreased sharply when the pump head was extremely small.Besides,the vibration was increased when large shedding cavities blocked the flow channel.During the rotating cavitation,the cavity structures in the opposite channels were similar to each other,and the cloud shedding frequency was around 27 Hz according to visual observations and the fast Fourier transform of inlet pressure fluctuations.关键词
离心泵/振动/旋转空化/可视化Key words
centrifugal pump/vibration/rotating cavitation/visualization分类
机械制造引用本文复制引用
叶阳辉,朱相源,孙光普,李国君..离心泵内空泡演化与其对振动的影响[J].农业机械学报,2017,48(6):88-93,137,7.基金项目
国家自然科学基金项目(51076126) （51076126）
