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Research Papers: Energy Conversion/Systems

Catastrophe Performance Analysis of Steam-Flow-Excited Vibration in the Governing Stage of Large Steam Turbines With Partial Admission

[+] Author and Article Information
Shuhong Huang

School of Energy and Power Engineering,
Huazhong University of Science and Technology,
China, Wuhan430074

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 3, 2012; final manuscript received February 9, 2013; published online May 27, 2013. Assoc. Editor: Muhammad M. Rahman.

J. Energy Resour. Technol 135(4), 041601 (May 27, 2013) (8 pages) Paper No: JERT-12-1204; doi: 10.1115/1.4023742 History: Received September 03, 2012; Revised February 09, 2013

Steam-flow-excited vibration is one of the main faults of large steam turbines. The catastrophe caused by steam-flow-excited vibration brings danger to the operation of units. Therefore, it is significant to identify the impact factors of catastrophe, and master the rules of catastrophe. In this paper, the quantitative analysis of catastrophe performance induced by steam exciting force in the steam turbine governing stage is conducted based on the catastrophe theory, nonlinear vibration theory, and fluid dynamics. The model of steam exciting force in the condition of partial admission in the governing stage is derived. The nonlinear kinetic model of the governing stage with steam exciting force is proposed as well. The cusp catastrophe and bifurcation set of steam-flow-excited vibration are deduced. The rotational angular frequency, the eccentric distance and the opening degrees of the governing valves are identified as the main impact factors to induce catastrophe. Then, the catastrophe performance analysis is conducted for a 300 MW subcritical steam turbine. The rules of catastrophe are discussed, and the system's catastrophe areas are divided. It is discovered that the system catastrophe will not occur until the impact factors satisfy given conditions. Finally, the numerical calculation method is employed to analyze the amplitude response of steam-flow-excited vibration. The results verify the correctness of the proposed analysis method based on the catastrophe theory. This study provides a new way for the catastrophe performance research of steam-flow-excited vibration in large steam turbines.

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Figures

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Fig. 1

Structure of the governing stage nozzles

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Fig. 2

Structure of the stator blades and the rotor blades

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Fig. 3

The cusp catastrophe and bifurcation set of vibration

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Fig. 4

Catastrophe area of the rotational angular frequency ω and the eccentric distance e when the governing valve 3's opening degree k = 0.2

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Fig. 5

Catastrophe area of the rotational angular frequency ω and the eccentric distance e when the governing valve 3's opening degree k = 0.6

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Fig. 6

Catastrophe area of the rotational angular frequency ω and the eccentric distance e when the governing valve 3's opening degree k = 1

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Fig. 7

curve of the eccentric distance e and the amplitude a when the governing valve 3's opening degree k = 0.2 and the rotational angular frequency ω=314 rad/s

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Fig. 8

curve of the eccentric distance e and the amplitude a when the governing valve 3's opening degree k = 0.6 and the rotational angular frequency ω=314 rad/s

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Fig. 9

curve of the eccentric distance e and the amplitude a when the governing valve 3's opening degree k = 1 and the rotational angular frequency ω=314 rad/s

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