【摘要】 在超临界汽轮机和超超临界汽轮机中,气流激振力对系统影响显著。因此,研究了气流激振力对转子-密封系统动力学特性的影响,采用Muszynska密封力模型建立转子-密封系统非线性动力学方程,利用Floquet理论研究系统周期解稳定性,根据系统的周期响应、频谱图、Poincar啨映射图、分岔图,分析了系统在特定转速及特定转子系统参数下的非线性动力学特性。更多还原

【Abstract】 The influence of the flow induced force is evident in ultra supercritical and the supercritical steam turbines. The dynamic characteristics of the flow induced force acting on rotor-seal systems was investigated.The nonlinear dynamic model of the rotor-seal system was established in accordance with Muszynska seal model. Floquet theory was applied to study the stabilities and dynamic behaviors of periodic solutions of the system. The dynamic characteristics of the system at certain rotating speed and certain physical parameters were analyzed in terms of periodical responses, Poincaré maps, frequency spectrum chart, bifurcation charts, etc.更多还原