| Citation: | SI Heyong, CAO Lihua, GUO Shuai, et al. Time-domain analysis of rotordynamic characteristics with steam flow excited vibration in seal[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2069-2076. doi: 10.13700/j.bh.1001-5965.2019.0571(in Chinese)
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In order to solve the problem of steam flow excited vibration caused by rotor eccentricity in steam turbine and the defects of static eccentric rotor whirling motion model in rotordynamic characteristics study, the dynamic mesh was adopted to simulate the authentic rotor three-dimensional whirling motion in order to study rotordynamic characteristics in time domain. The results show that the exciting force and the rotordynamic coefficients present the trigonometric function changes while the rotor whirls, and the direction of radial force changes with rotor central position. The rotordynamic characteristics are influenced by the eccentricity, whirling speed, rotational speed and pressure ratio. Under rated condition, the radial force and tangential force increase about 25-35 N averagely with the 10% increase in eccentricity. As the whirling speed increases, the tangential force, direct damping and cross damping decrease. With the increase of pressure ratio, the radial force increases, while tangential force decreases. In a certain range, the absolute value of maximal exciting force decreases when the rotational speed becomes higher.
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