Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Numerical Evaluation of Flow Nature at the Downstream of a Ball Valve Used for Gas Pipelines with Valve Opening Rates

개도율에 따른 가스파이프라인용 볼 밸브 후류유동의 수치평가

  • KIM, CHUL-KYU (Korea Institute of Civil Engineering and Building Technology) ;
  • LEE, SANG-MOON (Korea Institute of Civil Engineering and Building Technology) ;
  • JANG, CHOON-MAN (Korea Institute of Civil Engineering and Building Technology)
  • 김철규 (한국건설기술연구원 국토보전연구본부) ;
  • 이상문 (한국건설기술연구원 국토보전연구본부) ;
  • 장춘만 (한국건설기술연구원 국토보전연구본부)
  • Received : 2018.06.28
  • Accepted : 2018.08.31
  • Published : 2018.08.31
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Abstract

Ball valve has been widely used in the field of high-pressure gas pipeline as an important component because of its low flow resistance and good leakage performance. The present paper focuses on the flow nature at the downstream of the ball valve used for gas pipelines according to valve opening rates. Steady 3-D RANS equations, SC/Tetra, have been introduced to analyze the flow characteristics inside the ball valve. Numerical boundary conditions at the inlet and outlet of the valve system are imposed by mass flow-rate and pressure, respectively. Velocity distributions obtained by numerical simulation are compared with respect to the valve opening rates of 30, 50, and 70%. Cavity distributions, asymmetry flow velocity and the flow stabilization point at each opening rate are also compared. When the valve opening rates are 30 and 50%, the flow stabilization requires the sufficient length of 10D or more due to the influence of the recirculation flow at the downstream of the valve.

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References

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