Transient simulation and experiment validation on the opening and closing process of a ball valve
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The ball valve is an important device in the pipeline transportation system of nuclear power plants. Itsoperational stability and safety directly affect the normal working of nuclear power plants. In this study,the transient numerical simulation of the opening and closing process of a ball valve was conducted onthe basis of the flow interruption capability experiment of the ball valve by using the moving meshmethod and inlet and outlet variable boundary conditions. The flow rate and pressure difference withtime of the opening and closing process of the ball valve were studied. The internal flow characteristics ofthe ball valve under different relative openings were analyzed in conjunction with the typical back-stepflow structure. Results show that the transient numerical results agree well with the experimental results. The internal flow characteristics of the ball valve are similar at the same opening during openingand closing process. At small opening, the spool and outlet channels easily form a back-step flowstructure. The disappearance and generation of backflow vortices during opening and closing occur at85% opening and 75% opening, respectively. With the decrease in opening degree, the difference invortex core area in the flow channel of the ball valve spool in the opening and closing process graduallyappears. The research results provide some reference value for the design and optimization of ball valves.
Abstract
The ball valve is an important device in the pipeline transportation system of nuclear power plants. Itsoperational stability and safety directly affect the normal working of nuclear power plants. In this study,the transient numerical simulation of the opening and closing process of a ball valve was conducted onthe basis of the flow interruption capability experiment of the ball valve by using the moving meshmethod and inlet and outlet variable boundary conditions. The flow rate and pressure difference withtime of the opening and closing process of the ball valve were studied. The internal flow characteristics ofthe ball valve under different relative openings were analyzed in conjunction with the typical back-stepflow structure. Results show that the transient numerical results agree well with the experimental results. The internal flow characteristics of the ball valve are similar at the same opening during openingand closing process. At small opening, the spool and outlet channels easily form a back-step flowstructure. The disappearance and generation of backflow vortices during opening and closing occur at85% opening and 75% opening, respectively. With the decrease in opening degree, the difference invortex core area in the flow channel of the ball valve spool in the opening and closing process graduallyappears. The research results provide some reference value for the design and optimization of ball valves.
참고문헌 (21)
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