摘要
利用FLUENT软件对全焊接球阀(筒状)内部三维流场进行数值模拟,探究球阀从关闭到完全开启过程的流量特性。以不可压缩介质(水)为例,分析7个不同开度(10%、30%、50%、70%、80%、90%、100%)下球阀内部流场的变化情况,得到该球阀的前后压差和进出口流量,并计算得到球阀的流阻系数,然后根据相关公式求得不同开度下水的流量系数。通过对比可压缩介质与不可压缩介质的特性,利用密度比转换,求得可压气体(天然气)在不同开度下的流量系数,进而得到可压气体的流量系数与开度之间的关系曲线。与球阀的工作流量特性对比分析发现,模拟结果符合实际,为可压缩介质在球阀中流动状态的研究提供参考。
FLUENT software is utilized to numerically simulate internal three-dimensional flow field of all-welded ball valve （ cylin- drical） and the simulation is used to explore the flow characteristics of the valve from closing to opening fully. Taken incompressible medium as an example, ball valve＇ s internal flow field changing situation was analyzed under 7 different open degrees （ 10% , 30% , 50% , 70%, 90% , 100% ） ,and the valve inlet and outlet pressure and flow rate were obtained. Then the flow resistance coefficient was worked out and the water flow coefficient under different opening degree was calculated. By compared the properties of compressi- ble and incompressible medium and using density ratio conversion, the flow coefficient of compressible natural gas under different open degrees was computed and the relationship between compressible gas flow coefficient and opening degree was obtained. Simulation re- sults were in accordance with realities. The research has guiding significance for the study that the flow state of compressible medium in ball valve.
作者
张希恒
王廷
焦元阳
冯明
ZHANG Xiheng WANG Ting JIAO Yuanyang FENG Ming(College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050 Chin)
出处
《西华大学学报（自然科学版）》
CAS
2017年第2期6-9,86,共5页
Journal of Xihua University:Natural Science Edition
关键词
全焊接球阀
可压介质
流阻系数
流量系数
流量特性
all-welded ball valve
compressible medium
flow resistance coefficient
flow coefficient
flow characteristics
