耦合热、动载荷的汽流激振对汽轮机转子稳定性的影响  

Effectof Steam Turbine Rotor Stability by Steam Flow Excited Vibration Coupled Thermal and Dynamic Loads

作　　者：薛川 曹丽华[1] 司和勇 XUE Chuan;CAO Li-hua;SI He-yong(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林132012

出　　处：《汽轮机技术》2023年第1期35-38,共4页Turbine Technology

基　　金：国家自然科学基金项目(52176003)。

摘　　要：为揭示热、动载荷对汽轮机转子稳定性的影响,利用集总参数法建立的超超临界汽轮机高压缸转子各向异性支承模型,并将数值模拟获得的耦合前后的汽流激振力施加到对应的结点上,通过Riccati传递矩阵法求解并分析耦合热、动载荷对转子稳定性的影响,结果表明:耦合前后的固有转速都随着负荷的增加,一阶增加,二阶减小,且变化不大,但对比来看耦合后的固有转速明显低于耦合前的;随着负荷的增加,一阶振幅的变化幅度减小;在较高负荷时热、动载荷可以提高一阶对数衰减率,但也存在着转子失稳风险。In order to reveal the influence of thermal and dynamic loads on the stability of the steam turbine rotor,the anisotropic bearing model of the ultra-supercritical steam turbine high-pressure cylinder rotor is established by the lumped parameter method,and the steam flow excitation force before and after the coupling obtained by the numerical simulation is applied to the corresponding nodes,and the solution is solved by the Riccati transfer matrix method,and the effect of coupled thermal and dynamic loads on rotor stability is analyzed.The results show that as the load increases,the first-order inherent speed of rotor increases and the second-order inherent speed decreases,but the inherent speed after the coupling is noticeably lower than that before the coupling.As the load increases,the change scope of the first-order amplitude shrinks.The first-order logarithmic decrement rate can be increased under the relatively higher load by coupling thermal and dynamic loads,but the stability margin of rotor is insufficient,which causes the instability.

关 键 词：超超临界汽轮机 热、动载荷 汽流激振 稳定性 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]