摘要
研究蜗壳、叶轮途径流体力诱发的离心泵振动,分析CFD蜗壳内表面流体力作用下电机-离心泵-机架FEM模型瞬态响应;用Newmark-β算法分析CFD叶轮表面流体合力、合力矩作用下叶轮-转轴-支撑-机架转子动力学模型响应;并对比蜗壳、叶轮两条途径流体力诱发离心泵基座振动。结果表明,泵内表面流体压力脉动为宽频激振源,会诱使离心泵系统产生各阶模态振动;流体力通过叶轮途径诱发离心泵基座振动位移幅值谱最大峰值出现在叶轮转频处,振动加速度幅值谱最大峰值出现在叶轮流道通过频率处,而非叶片通过频率处;流体力通过蜗壳途径诱发的离心泵基座振动远小于叶轮途径诱发的振动,叶轮-转轴-支撑-机架为流体激励诱发离心泵基座振动的主要途径。
Studying on fluid induced vibration of a centrifugal pump through volute path and impeller path is valuable and instructive for vibration reduction.Here,the transient response of a motor-pump-workbench FE medal was analyzed with the excitation of fluid force on the interior surface of the centrifugal pump calculated using CFD.The response of a impeller-shaft-support- workbench rotordynamic model was also analyzed with Newmark-βalgorithm under the action of gross fluid force and torque on the impeller calculated using CFD.At last,the vibrations incited through the two paths were compared.The results showed that the fluid presssure pulsation on the interior surface of the volute is a wide frequancy-band vibration exitation source,and the vibration of each mode of the centrigugal pump system is excited by the fluid pressure pulsation;the maximum peak of the amplitude spectrum of the vibration displacement of the centrifugal pump workbench incited by fluid force through impeller path appears at the impeller-rotation frequency,while the spectrum maximum peak of the vibration acceleration of the workbench appears not at the blade passing frequency but at the flow channel passing frequency;the vibration of the workbench incited by fluid force through volute path is far less than that through impeller path,so the impeller-shaft-support-workbench path is the main way for fluid induced centrifugal pump workbench vibration.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第10期1-7,共7页
Journal of Vibration and Shock
关键词
离心泵
蜗壳
叶轮
流体激振
转子动力学
centrifugal pump
impeller
volute
fluid exciting vibration
rotordynamics
