Abstract
The large diameter butterfly valve used in Qinghai Naqu hydropower station was subjected to strong vibration when the opening was small. In view of the phenomenon of strong vibration and damage of the valve, the fluid theory analysis is carried out and the appropriate mathematical model of fluid analysis is selected. This paper established the flow model of butterfly valve for different opening degrees with the 2D drawings and simulated the flow field by using CFX software. Through numerical simulation, the flow field characteristics of the valve under different opening degrees are obtained, and it is found that the valve failure is caused by vortex street effect. The results of numerical analysis show that the vortex are the most strong in the range of 5% to 30% and The vortex street phenomenon is the strongest at 5% opening. When the opening is greater than 30%, the vortex street effect decreases gradually. Meanwhile, the reason of vortex street effect is that the structure of butterfly plate is complex, and an improved structure was given and the results of numerical analysis show that the vortex effect decreased significantly for the new one. This new structure can effectively prevent the vortex resonance and give an example for the new design of a large butterfly valve.
Highlights
As one of the most advanced butterfly valves, triple eccentric butterfly valve has the best sealing performance and is widely used in petroleum, chemical and electric power industries
The flow field characteristics of the main control triple eccentric butterfly valve with the diameter of 3400 mm in gaqu hydropower station of Qinghai Province as the carrier, aiming at the instability of the system under small opening in practical application, the flow field characteristics are analyzed and studied
The results show that the vortex street phenomenon downstream of the valve is strong when the opening is small, and the vortex street effect gradually weakens with the increase of the opening
Summary
As one of the most advanced butterfly valves, triple eccentric butterfly valve has the best sealing performance and is widely used in petroleum, chemical and electric power industries. In the central and western regions of China, the main control valve of medium and large hydropower stations generally uses large diameter butterfly valve or large ball valve. Referring to the relevant literature, most of the design of large diameter butterfly valve in China is mainly based on traditional experience, which leads to the increase of production cost. The flow field characteristics of the main control triple eccentric butterfly valve with the diameter of 3400 mm in gaqu hydropower station of Qinghai Province as the carrier, aiming at the instability of the system under small opening in practical application, the flow field characteristics are analyzed and studied. Referring to the relevant literature, there are few researches on the flow analysis of three eccentric valves, especially the large-scale ones. Wang Yuhao and He Qingzhong: The Flow Field Analysis and Structure Optimization of Large Diameter Butterfly Valve
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: American Journal of Mechanical and Industrial Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
