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최근우(G.-W. Choi),박권종(G.-J. Park),김윤제(Youn J. Kim) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The functions of the plug valve are the control of flow rate as well closing and opening pipe lines. Analyses on the flow characteristics in plug valve port are required to improve the performance and safety at severe operating conditions such as high-pressure and high-temperature. In this study, numerical analyses are carried out with varying the opening rate (fraction of the full open to close) of the valve and the shapes of valve port: straight, convex, concave and mixed shapes. The parameters influencing the flow characteristics in the valve are the discharge coefficient(Cv) and the resistance coefficient(K). Therefore, the distributions of static pressure, velocity vector and stream lines are investigated, and Cv and K are calculated in each opening rate and shape. In case of full open, the static pressure passed through the valve port has almost been recovered. However, in case of other opening rates, the pressure does not permanently regained due to pressure drop leading to loss. This phenomenon in each shape of the valve shows the different behaviors. Calculation results show that the mixed shape has the best flow attribute.