摘要
针对超(超)临界工况下调节阀压降大、流速高的特点,以传统迷宫碟片式调节阀为基础,提出一种新型水滴迷宫式碟片调节阀。利用Fluent软件进行数值模拟,研究阀门在不同开度下的流通性能及不同水滴级数对阀门降压控速能力的影响。研究表明,新结构碟片流通性能良好,可以满足阀门工作条件要求,增加水滴级数会降低阀门流通性能;随着水滴级数的增加,各级水滴间的压降和阀内流速均呈现减小的趋势,五级水滴介质平均压降为5.08MPa,比二级水滴降低了6.26 MPa;最大速度为108m/s,降低了40%;碟片流道出口处存在气蚀现象,水滴级数的增加可减小气蚀区域。
In view of the large pressure drop and high flow rate of super-supercritical conditions,a new type of water-jet labyrinth disc regulating valve is proposed based on the traditional labyrinth disc-type regulating valve.Numerical simulations were carried out using Fluent software to study the flow performance of the valve at different opening degrees and the effect of different water droplet levels on the valve's step-down speed control capability.The research shows that the new structure disc has good circulation performance and can meet the working conditions of the valve.Increasing the number of water droplets will reduce the flow performance of the valve.With the increase of the number of water droplets,the pressure drop between the water droplets at each level and the flow rate in the valve are reduced.The average pressure drop of the five-stage water droplet medium is 5.08 MPa,which is 6.26 MPa lower than that of the second-stage water droplets;The maximum speed is 108 m/s,which reduces 40%;There is cavitation at the outlet of the disc passageway,and increase of the number of water droplets can decrease the cavitation region.
作者
廖伯权
王佳
何庆中
刘惺
雷涛
LIAO Bo-quan;WANG Jia;HE Qing-zhong;LIU Xing;LEI Tao(School of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,China)
出处
《水电能源科学》
北大核心
2020年第7期126-129,188,共5页
Water Resources and Power
基金
四川省教育厅创新团队项目(17TD0026)
四川省科技厅重点支撑计划项目(2017GZ0359)。
关键词
流场特性
迷宫式调节阀
碟片结构
水滴型
超(超)临界工况
flow field characteristics
labyrinth regulating valve
disc structure
drop type
super(super)critical conditions
