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A Two-Dimensional Study of Transonic Flow Characteristics in Steam Control Valve for Power Plant

International journal of fluid machinery and systems v.3 no.1 , 2010년, pp.58 - 66  
Yonezawa, Koichi (Graduate School of Engineering Science, Osaka University ) ;  Terachi, Yoshinori ( Graduate School of Engineering Science, Osaka University ) ;  Nakajima, Toru ( Graduate School of Engineering Science, Osaka University ) ;  Tsujimoto, Yoshinobu ( Graduate School of Engineering Science, Osaka University ) ;  Tezuka, Kenichi ( Engineering R&D Division, Tokyo Electric Power Company ) ;  Mori, Michitsugu ( Engineering R&D Division, Tokyo Electric Power Company ) ;  Morita, Ryo ( Nuclear Energy Systems Department, Central Research Institute of Electric power Industry ) ;  Inada, Fumio ( Nuclear Energy Systems Department, Central Research Institute of Electric power Industry)
Abstract

A steam control valve is used to control the flow from the steam generator to the steam turbine in thermal and nuclear power plants. During startup and shutdown of the plant, the steam control valve is operated under a partial flow conditions. In such conditions, the valve opening is small and the pressure deference across the valve is large. As a result, the flow downstream of the valve is composed of separated unsteady transonic jets. Such flow patterns often cause undesirable large unsteady fluid force on the valve head and downstream pipe system. In the present study, various flow patterns are investigated in order to understand the characteristics of the unsteady flow around the valve. Experiments are carried out with simplified two-dimensional valve models. Two-dimensional unsteady flow simulations are conducted in order to understand the experimental results in detail. Scale effects on the flow characteristics are also examined. Results show three types of oscillating flow pattern and three types of static flow patterns.

주제어

#Transonic flow   #Control valve   #Flow oscillation  

참고문헌 (7)

  1. Widel, K.-E., 1980, “Governing Valve Vibrations in a Large Steam Turbine,” Practical Experiences with Flow-Induced Vibrations, Springer-Verlag, New York, pp. 320-322. 
  2. Araki, T., Okamoto, Y. and Otomo, F., 1981, “Fluid-Induced Vibration of Steam Control Valves (In Japanese),” Toshiba Review, Vol. 36, No. 7, pp. 648-656. 
  3. Jibiki, K., 2000, “Fluctuation of Steam Control Valve (In Japanese),” Turbomachinery, Vol. 28, No. 4, pp. 225-229. 
  4. Morita R., Inada F., Mori M., Tezuka K., and Tsujimoto Y., 2007, “CFD Simulations and Experiments of Flow Fluctuations Around a Steam Control Valve,” Journal of Fluids Engineering 129, 48, pp. 48-57. 
  5. Yee, H., 1987, “Upwind and Symmetric Shock-Capturing Schemes,” NASA-TM-89464. 
  6. Takakura, Y., Ogawa, S., et al., 1989, “Turbulence Models for 3D Transonic Viscous Flows,” Proc. AIAA 9th Comp. Fluid Dynamics Conf., 89-1952-CP, pp. 240–248. 
  7. Yoon, S., and Jameson, A., 1988, “Lower-Upper Symmetric-Gauss-Seidel Method for the Euler and Navier-Stokes Equations,” AIAA Journal, 26(9), pp. 1025-1026. 

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