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,本文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、Poincaré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。
The influence of the low induced force is evidence in the ultra supercritical and the supercritical steam turbine. The dynamic characteristics of the flow induced force acting on rotor-seal systems is investigated in the paper.The nonlinear dynamic model of the rotor-seal system is established with Muszynska model. And Floquet theory is applied to study stabilities and dynamic behaviors of the periodic solutions in the systems. The dynamic characteristics of the system at the certain rotating speed and the certain physic parameters are analyzed by the periodical responses, Poincaré maps, frequency spectrums chart, bifurcation charts, etc.