Abstract:To obtain the modal characteristic of multistage pump rotor in operation, the three-dimensional flow passage and the structure of the rotor for one mine emergency drainage multistage pump were established, then, based on the method of fluid-solid coupling, a model of the rotor which contains impellers and shaft was simulated with ANSYS WORKBENCH software considering the influence of both the damping and pre-stress from fluid especially. In addition, the modal of rotor was simulated without pre-stress and with different speed of revolution respectively, the characteristics of modal under different situations were obtained, and the reason for different profiles of modal was analyzed.Results show that pre-stress in the pump has a significant influence on the modal of rotor, then, the damping from fluidy has a great effect on that as well. Calculation for the modal of rotor can contribute significantly to reasonable design of multistage pump and determination of revolution.
[1]CHEN Chunxin, WU Dazhuan,TAN Shanguang, et al. Computing critical speeds for multiple-stage centrifugal pumps with dependent support properties[C]//Procee-dings of the 4th International Symposium on Fluid Machinery and Fluid Engineering。 Beijing:[s.n.],2008:306-309.[2]孙兴华,王跃方,郭婷.离心泵转子的湿临界转速计算及边界环境对其动力特性的影响[J]. 水泵技术,2011(2):26-30. SUN Xinghua,WANG Yuefang,GUO Ting. Calculation of the critical speed of the centrifugal pump rotor and the influence of the boundary conditions on rotor dynamic characteristics[J]. Pump technology,2011(2):26-30.(in Chinese)[3]蒋小平,施卫东,李伟,等.泵水润滑轴承-转子系统的动力学特性研究[J]. 农业机械学报,2013,44(1):62-66. JIANG Xiaoping, SHI Weidong, LI Wei. Rotor dynamic characteristics of water lubricated bearing for pumps[J].Journal of the CSAM,2013,44(1):62-66.(in Chinese)[4]WU Y L, LIU S H, DOU H S, et al. Vibration of hydraulic machinery [M]. Berlin: Springer, 2013:147-159.[5]陈宁,成晓伟,陈乃娟.多级离心泵转子部件有限元分析[J]. 科学技术与工程,2010,10(14):3459-3463. CHEN Ning, CHENG Xiaowei, CHEN Naijuan.The FE analysis of a multistage centrifugal pump rotor[J]. Science technology and engineering,2010,10(14):3459-3463.(in Chinese)[6]曹卫东,高一,王秀兰.基于Ansys的矿用潜水电泵转子系统的优化设计[J]. 排灌机械工程学报,2012,30(2):157-161. CAO Weidong,GAO Yi,WANG Xiulan.Optimization design of submersible pump rotor system for coal mine based on Ansys[J]. Journal of drainage and irrigation machinery engineering,2012,30(2):157-161.(in Chinese)[7]MUHAMMAD R S, GUILHEM M, ALAIN B. Modeling and analysis of nonlinear rotor dynamics due to higher order deformations in bending [J]. Applied mathematical modelling, 2011, 35: 2145-2159.[8]ZHOU Wenjie, WEI Xuesong, WEI Xianzhu, et al. Numerical analysis of a nonlinear double disc rotor-seal system[J]. Journal of Zhejiang University-Science A(Applied Physics & Engineering), 2014, 15(1):39-52.[9]CHRISTOPHER D.Oil-free shaft support system rotor dynamics: past, present and future challenges and opportunities [J]. Mechanical systems and signal processing, 2012, 29: 67-76.[10]施卫东,郭艳磊,张德胜,等.大型潜水轴流泵转子部件湿模态数值模拟[J]. 农业工程学报,2013,29(24):72-78. SHI Weidong,GUO Yanlei,ZHANG Desheng. Numerical simulation on modal of large submersible axial-flow pump rotor[J]. Tournal of the CSAE,2013,29(24):72-78.(in Chinese)[11]施卫东,徐燕,张启华,等.多级潜水泵内部压力脉动特性[J]. 排灌机械工程学报,2014,32(3):196-201. SHI Weidong,XU Yan,ZHANG Qihua.Characteristics of pressure pulsation in multi-stage submersible pump[J]. Journal of drainage and irrigation machinery engineering,2014,32(3):196-201.(in Chinese)