Abstract:In order to analyze the effects of butterfly valve disc structure on the valve cavitation coefficient, flow resistance coefficient and the internal flow characteristics, based on finite volume method and standard k-ε turbulence model, at different opening degrees (rotation angle of valve plate), threedimensional steady numerical simulation calculation of butterfly valves of combtype and wedgetype structure discs was carried out. Velocity distribution, pressure distribution and velocity flow chart of the valves under different working conditions were compared and analyzed. The effects of velocity on the formation and expansion of the vortex was obtained. The results show that the fluid in wedgetype disc butterfly valve flows more smoothly, and the flow resistance coefficient of the valve decreases at larger opening. Therefore, it reduces the impact of flow on the valve body and passage and improves flow circulation. The cavitation coefficient of wedgetype disc butterfly valve is bigger than that of combtype disc and the anticavitation performance is enhanced. The study provides a basis for analyzing the impact conditions inside the valve and can be useful in optimizing valve design.
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