摘要
为了研究高温熔盐循环主泵(冷盐泵)轴系振动和变形特性,有效解决运行过程中的共振疲劳等关键问题,以新开发的某型号高温熔盐循环主泵作为研究对象,对其外特性进行数值模拟研究与试验验证,并对有无预应力作用的高温熔盐循环主泵转子系统的固有频率和振型、临界转速以及基于模态分析的谐响应分析进行了求解.结果表明:外特性数值计算结果与试验结果吻合较好,数值计算结果略高于试验结果,计算误差在5%之内;有预应力下的转子固有频率大于无预应力下转子的固有频率,增幅最高为30%,各阶振幅随阶次增加先增大后减小;计算得到的各阶模态对应的临界转速远大于转子工作转速的±10%,可知该转子系统在标准工况下运行不会发生共振;当高温熔盐循环主泵转子受到不平衡激励的作用时,第5级叶轮振幅最大,响应位移随着频率的增加先增大后减小,当频率达到第1,2阶临界转速对应的固有频率时,谐响应的响应位移达到最大值;当转子系统受到不同相位差的多个不平衡激励时,产生的响应位移幅值随着相位差的增大而减小.因此应尽量避免转子系统在第1,2阶模态对应的临界转速下工作,在转子系统安装时应使叶轮之间相位存在交错.
In order to study the vibration and deformation characteristics of the shaft system of the high-temperature molten salt circulation main pump(cold salt pump)and effectively eliminate key issues such as resonance fatigue during operation,a newly developed model of molten salt pump was selected as the research subject.Its hydraulic characteristics were numerically simulated and experimentally verified.The natural frequency and vibration mode,critical speed,and harmonic response analysis based on modal analysis of the molten salt rotor system with and without prestressing were solved.The results indicate that the numerical simulation results of the hydraulic characteristics of the pump with 300℃molten salt and clear water media are in good agreement with the experimental results,with the numerical simulation results slightly higher than the experimental results,with an error less than 5%.The natural frequency of the rotor with prestress is greater than that without prestress,with a maximum increase of 30%,and the amplitude of each order increases first and then decreases with the order.The critical speeds corresponding to the various mode shapes obtained by calculation are much greater than±10%of the rotor′s operating speed,indicating that the rotor system do not resonate under standard conditions.When the rotor of the molten salt circulation is subjected to unbalanced excitation,the amplitude of the 5th stage impeller is the largest,and the response displacement increases first and then decreases with the frequency,reaching the maximum value when the frequency reaches the natural frequency corresponding to the 1st and 2nd order critical speeds.When the rotor system is subjected to multiple unbalanced excitations with different phase differences,the response displacement amplitude decreases with the increase of the phase difference.Therefore,it is advisable to avoid operating the rotor system at the critical speeds corresponding to the 1st and 2nd order modes,and the phase between the impellers should be staggered during the installation of the rotor system.
作者
高雄发
赵阳
张德胜
施卫东
王道红
金永鑫
朱智彧
GAO Xiongfa;ZHAO Yang;ZHANG Desheng;SHI Weidong;WANG Daohong;JIN Yongxin;ZHU Zhiyu(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Mechanical Engineering,Nantong University,Nantong,Jiangsu 226019,China;Jiangsu Feiyue Pump Group Co.,Ltd.,Taizhou,Jiangsu 214537,China;Key Laboratory of Fluid and Machinery and Engineering,Xihua University,Chengdu,Sichuan 610039,China)
出处
《排灌机械工程学报》
北大核心
2025年第10期973-980,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51909108)。
关键词
熔盐泵
介质物性
流-固-热耦合
谐响应分析
转子动力学
molten salt pump
medium properties
fluid-structure-thermal coupling
harmonicresponse analysis
rotor dynamics
