根据多级泵零件二维图,应用Pro/E软件对转子系统主要部件进行实体建模,采用FLUENT软件对多级泵内部流场进行数值模拟,分析了轴向力及径向力随不同工况的变化情况,基于ANSYS软件对转子系统施加静力载荷,进行静力学、谐响应和瞬态动力学等分析.结果表明:转子系统在第1阶临界转速下的安全区运行,转子系统的振幅与转速变化呈非线性关系;在突加激励力的开始阶段各节点出现较大的振幅,随后振幅逐渐减小并趋于稳定;左侧轴承的振动幅值比右侧轴承的振动幅值大了1个数量级;首级叶轮的振动幅值比次级叶轮的振动幅值稍大;在位移振动曲线中,出现了明显的“拍振”现象,节点振动趋于稳定后,振幅很小,系统的稳定性较好.
According to 2-D map of multistage pump, the main parts of rotor system were modeled by Pro/E software. The fluid field of multistage pump was numerical simulated by FLUENT program to analysis the changes of axial force and radial force at different work conditions. With the static loading on rotor system, statics, harmonic response and transient dynamics were analyzed by ANSYS program. The results show that it is nonlinear relationship between the amplitude and speed of rotor system when the rotor system is operated in safe zone under the first critical speed. Applied exciting force, each node at beginning stage shows large amplitude, and the amplitude decreases gradually to a stable value. The vibration amplitude of left bearing nodes is an order larger than that of right. The vibration amplitude of first grade impeller is slightly larger than that of secondary impeller. There is obvious beat vibration in displacement vibration cures. The stability of system is good with small amplitude when the node vibration tends to be constant.
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