基于多重激励的悬臂式多级离心泵轴心轨迹研究

发布时间：2019-01-22 18:29

【摘要】：针对悬臂式多级离心泵易出现陀螺效应,造成转子失稳与泵机组振动等问题,根据理论公式计算所得的密封流体激励力、泵腔流体激振力和附加质量代入有限元模型进行仿真计算,得到悬臂式多级离心泵的轴心轨迹图,并分别与未加载3种激励力、只加载密封流体激励力与添加密封和泵腔流体激振力的计算结果进行对比分析,最后利用Bently 408型便携式数据采集系统对轴心轨迹进行试验,对仿真进行验证。研究结果表明:加载叶轮口环密封力能够提高转子系统的稳定性,并能有效降低径向位移幅值;泵腔中流体激振力增加了转子系统的交叉刚度,导致振幅增加;相比于密封流体激励力和泵腔流体作用力,流体附加质量对悬臂式转子系统的瞬态响应的影响更为显著。
[Abstract]:In view of the gyroscopic effect of cantilever multistage centrifugal pump, which results in rotor instability and pump unit vibration, the sealing fluid excitation force is calculated according to the theoretical formula. The fluid excitation force and the additional mass of the pump cavity are simulated and calculated by the finite element model. The axis trajectory diagram of the cantilever multistage centrifugal pump is obtained, and three kinds of excitation forces are obtained, respectively. The calculation results of only loading seal fluid excitation force and adding seal and pump cavity fluid excitation force are compared and analyzed. Finally, the axis trajectory is tested by Bently 408 portable data acquisition system, and the simulation is verified. The results show that the stability of rotor system can be improved and the amplitude of radial displacement can be effectively reduced by loading the seal force of impeller opening ring, and the cross-stiffness of rotor system is increased by the fluid exciting force in pump cavity, which leads to the increase of amplitude. The effect of additional fluid mass on the transient response of the cantilever rotor system is more significant than that of the sealing fluid excitation force and the pump cavity fluid force.
【作者单位】：江苏大学流体机械工程技术研究中心;富瑞特种装备股份有限公司;
【基金】：国家重点研发计划项目(2017YFC0404204) 江苏省自然科学基金项目(BK20141302) 江苏省重点研发计划项目(BE2015001-2、BE2015119) 江苏省政策引导类计划项目(BY2015064-06) 江苏高校优势学科建设工程项目(PAPD)
【分类号】：TH311

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