Anisotropic Vibration Characteristics Analysis of Steam Turbine Rotor Influenced by Steam Flow Excited Force Coupling Thermal and Dynamic Loads

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-02-09 DOI:10.1115/1.4056887
Chuan Xue, Li-hua Cao, Heyong Si
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引用次数: 1

Abstract

In order to reveal the influence of thermal and dynamic loads coupling on vibration characteristic of steam turbine rotor, the high pressure cylinder anisotropic rotor of a 1000MW ultra-supercritical steam turbine was modeled by the lumped parameter method. The steam flow excited force of the front 8 stages obtained through the numerical simulation before and after the coupling was converted to the equivalent gas bearing and added on the rotor, and the influence of steam flow excited force on rotor vibration characteristics was obtained by the Riccati transfer matrix method. The results show that, considering the thermal and dynamic loads, the two ends of the ellipse trajectory are smaller and the middle is larger. Before and after coupling thermal and dynamic loads, the azimuth of ellipse trajectory increases with the increase of load and nodes. The greater the load, the greater the changing range of azimuth. As the load increases, the first-order natural speed of rotor increases and the second-order natural speed decreases, but the natural speed after the coupling is noticeably lower than that before the coupling. The change scope of the first-order amplitude shrinks with the load increasing. 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.
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蒸汽流激动力热动力耦合作用下汽轮机转子各向异性振动特性分析
为了揭示热负荷和动负荷耦合对汽轮机转子振动特性的影响,采用集总参数法对1000MW超超临界汽轮机高压缸各向异性转子进行了建模。通过耦合前后的数值模拟得到的前8级蒸汽流激振力转换为等效气体轴承并加到转子上,利用Riccati传递矩阵法得到蒸汽流激振力对转子振动特性的影响。结果表明,在考虑热载荷和动载荷的情况下,椭圆轨迹的两端较小,中间较大。在热载荷和动载荷耦合前后,椭圆轨迹的方位角随着载荷和节点的增加而增加。载荷越大,方位角的变化范围就越大。随着负荷的增加,转子的一阶固有转速增加,二阶固有转速降低,但耦合后的固有转速明显低于耦合前。一阶振幅的变化范围随着载荷的增加而缩小。在相对较高的载荷下,通过热载荷和动载荷的耦合,可以提高转子的一阶对数衰减率,但转子的稳定裕度不足,导致了不稳定。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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