Control valve is an accident prone equipment in high-parameter steam turbine, and its safety directly influences the economy and safety of the unit. In this study, a control valve of a 600 MW subcritical unit used in the power plant was investigated to reveal the mechanism of flow induced vibration of the control valve. It is found that the intermittent vibration of the control valve is a fluid-solid interaction phenomenon, which occurs in middle-opening and transonic flow condition. The phenomenon is a variable damping and nonlinear vibration for the valve stem system. The experimental results show that as the valve head tilts to different positions, the pressure fluctuation at the valve seat changes significantly at the same time. Unsteady numerical simulation is conducted when valve head is in the center and tilts toward three different directions with the same angle. The results indicate that the separation point between the high jet flow and valve head is changing with time. The thick boundary layer caused by transonic flow and the moving high-pressure region induced by impinging jet flow are the two main reasons for the flow pattern alternation. The average unbalanced force of fluid acting on valve head varies as the flow pattern alternates. And its direction is from center to the narrower side of the annular channel in the oblique section when valve head is tilted.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4558-5
PROCEEDINGS PAPER
Research on the Coupling Mechanism Between Alternating Flow Pattern and Valve Stem System of Steam Turbine Control Valve
Li-Fei Zeng,
Li-Fei Zeng
Xi’an Jiaotong University, Xi’an, China
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Guan-wei Liu,
Guan-wei Liu
Xi’an Jiaotong University, Xi’an, China
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Jing-ru Mao,
Jing-ru Mao
Xi’an Jiaotong University, Xi’an, China
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Shun-sen Wang,
Shun-sen Wang
Xi’an Jiaotong University, Xi’an, China
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Cong Zhang,
Cong Zhang
Xi’an Jiaotong University, Xi’an, China
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Jun-jie Zhang,
Jun-jie Zhang
Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd, Beijing, China
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Ya-tao Xu
Ya-tao Xu
Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd, Beijing, China
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Li-Fei Zeng
Xi’an Jiaotong University, Xi’an, China
Guan-wei Liu
Xi’an Jiaotong University, Xi’an, China
Jing-ru Mao
Xi’an Jiaotong University, Xi’an, China
Shun-sen Wang
Xi’an Jiaotong University, Xi’an, China
Cong Zhang
Xi’an Jiaotong University, Xi’an, China
Xin Yu
Xi’an Jiaotong University, Xi’an, China
Jun-jie Zhang
Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd, Beijing, China
Ya-tao Xu
Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd, Beijing, China
Paper No:
GT2014-26988, V01BT27A049; 10 pages
Published Online:
September 18, 2014
Citation
Zeng, L, Liu, G, Mao, J, Wang, S, Zhang, C, Yu, X, Zhang, J, & Xu, Y. "Research on the Coupling Mechanism Between Alternating Flow Pattern and Valve Stem System of Steam Turbine Control Valve." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines. Düsseldorf, Germany. June 16–20, 2014. V01BT27A049. ASME. https://doi.org/10.1115/GT2014-26988
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