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Technical Briefs

Establishment of Nonlinear Dynamic Model for Prediction of Rotordynamic Instability of Steam Turbine Rotor-Bearing System Caused by Partial Admission

[+] Author and Article Information
Ying Cui1

Department of Energy Science and Engineering,  Harbin Institute of Technology, Harbin 150001, People’s Republic of Chinacuiying@hit.edu.cn

Zhansheng Liu

Department of Energy Science and Engineering,  Harbin Institute of Technology, Harbin 150001, People’s Republic of China

Daren Yu1

Department of Energy Science and Engineering,  Harbin Institute of Technology, Harbin 150001, People’s Republic of Chinayudaren@hit.edu.cn

Yanfeng Duan

 State Nuclear Power Technology R&D Center, Beijing 100190, People’s Republic of China

1

Corresponding authors.

J. Eng. Gas Turbines Power 134(7), 074501 (May 23, 2012) (4 pages) doi:10.1115/1.4006078 History: Received December 18, 2011; Revised December 26, 2011; Published May 23, 2012; Online May 23, 2012

A nonlinear dynamic model is developed for a rotor-bearing system with radial steam force due to partial admission, taking into account the prediction of subsynchronous instability of a steam turbine. The optimum schemes are obtained by comparing the rotor responses subjected to maximal radial steam forces in different partial admission schemes. It is found through comparison that the instability of a rotor-bearing system is directly related to the direction of the radial steam force in the partial admission scheme.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Finite element model of an HP-IP rotor of the 210 MW steam turbine

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Figure 2

Location of the valves for the 210 MW steam turbine

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Figure 3

Comparison of journal orbits at the No. 2 bearing under partial and full admission

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Figure 4

Comparison of frequency spectra at the No. 2 bearing under partial and full admission

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Figure 5

Journal orbits at the No. 2 bearing versus partial admission schemes

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Figure 6

Frequency spectrum at the No. 2 bearing versus partial admission schemes

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