Effects of nonlinear steam flow exciting force on motion characteristics of ultra-supercritical steam turbine rotor

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 25-31.

CAO Lihua, YAN Hong, SI Heyong

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Abstract

Steam flow exciting force seriously affects safe and stable operation of an ultra-supercritical steam turbine.Here, a 3-D full cycle model for 1.5 stage high pressure cylinder of a 1 000 MW steam turbine was established.Nonlinear steam flow exciting forces under different loads were obtained using numerical simulation.The steam flow exciting force was coupled into a rotor-bearing-seal system to establish the system’s dynamic model, Runge-Kutta method was used to solve dynamic differential equations, and nonlinear motion characteristics of the rotor system were analyzed.The results showed that with increase in rotor rotating speed, the rotor vibration amplitude becomes smaller, and it is in a periodic motion under the rated rotating speed; with increase in load, the rotor system transits from periodic motion with chaotic tendency to periodic chaotic motion, and then enters complex chaotic motion; nonlinear steam flow exciting force affects the rotor motion in the form of frequency division; when load is low, the system vibration frequency is mainly 1/2 power frequency; with increase in load, the system vibration frequency is mainly power frequency, during this period, there are vibrations with 1/3 and 2/3 power frequencies too; due to effects of nonlinear steam flow exciting force, the rotor system is in chaotic motion, if the maximum Lyapunov exponent is larger than zero, the system may lose stability.

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ultra-supercritical steam turbine / steam flow exciting force / maximum Lyapunov exponent graph / motion characteristics

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CAO Lihua, YAN Hong, SI Heyong. Effects of nonlinear steam flow exciting force on motion characteristics of ultra-supercritical steam turbine rotor[J]. Journal of Vibration and Shock, 2021, 40(17): 25-31

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