应用三维造型软件Pro/E建立了超临界机组汽动锅炉给水泵转子物理模型,借助ANSYS Workbench12软件进行了转子模态分析,分别求解了转子在无载刚支、不同支承跨距、轴向拉力等情况下的临界转速.通过对复杂结构的转子进行动力分析,结果表明:在浸液转子“湿态”临界转速计算中,考虑轴向拉力的影响后,转子临界转速有较大提高,说明轴向拉力对转子临界转速具有较强的刚化作用,因此,对浸液多级离心泵转子“湿态”临界转速进行计算时,应考虑轴向力的影响.%The physics model of the rotor of a boiler-feeding-water pump powered by a gas-turbine used in the supercritical unit in a power plant was established by Pro/E software. The finite element modal analysis of the rotor was carried out by Workbench 12 of software ANSYS. The critical rotational speed of the rotor was computed by using the software with the conditions of no-load, rigid supports ,different supporting span and consideration of the influence of the tensile axial force respectively. The results showed that the critical rotational speed of the rotor tremendously increased when the tensile axial force was taken into account in wet-state with critical rotational speed of the rotor. The results indicated that the stiffening effect, caused by the tensile axial force, on the critical rotational speed of the rotor was obvious. Therefore, it is necessary to take tensile axial force into consideration for computing the wet-state critical rotational speed of the rotor when rotating in liquid for multi-stage centrifugal pumps.
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