개도율에 따른 가스파이프라인용 볼 밸브 후류유동의 수치평가

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 29; no. 4; pp. 370 - 377
• Main Authors: 김철규(Chul-kyu Kim), 이상문(Sang-moon Lee), 장춘만(Choon-man Jang)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2018
• Subjects: 기계공학; Gas pipeline; Recirculation flow; Asymmetry flow; 비대칭 유동; 가스파이프라인; 볼 밸브; 재순환 유동; 유동 특성; Ball valve; Flow nature
• ISSN: 1738-7264; 2288-7407

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.