涡街流量计内壁面压力分布的数值模拟  

Numerical simulation of wall pressure distribution in vortex flowmeter

作　　者：孙志强[1,2] 张宏建[2] 周孑民[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]浙江大学控制科学与工程学系工业控制技术国家重点实验室,浙江杭州310027

出　　处：《传感器与微系统》2008年第10期70-72,75,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金重点资助项目(60534030)

摘　　要：为了研究涡街流量计内部流场结构,通过GAMB IT软件的非结构化网格技术和FLUENT软件的RNGk-ε模型对涡街流量计的流场进行了三维数值模拟,描绘了涡街产生和脱落过程,着重分析了壁面压力分布随涡街脱落的演变情况。结果表明:涡街流场中靠近旋涡发生体的壁面静压有较明显的波动,在距离旋涡发生体一定范围内,越靠近旋涡发生体,静压幅度越大;而在对称于管道轴线的位置,壁面静压幅度相等,相位相反。该研究为优化涡街流量计的结构设计和测量性能提供了有益的参考。In order to investigate the flow field structure in vortex flowmeter, three-dimensional numerical simulation for vortex flow is conducted using the GAMBIT unstructured mesh and the FLUENT RNG k-ε model. The generation and shedding process of a vortex street is depicted, and the analysis of the evolution of the wall pressure with vortex shedding is emphasized. The results show that the wall pressure behind the bluff body fluctuates obviously, and the amplitude of wall pressure is more intensive at the position closer to the bluff body within a certain distance. At the positions symmetric to the pipe axis ,the wall pressures are of equal amplitude and of reverse phase. This study provides beneficial reference for the design and performance optimization of vortex flowmeters.

关 键 词：涡街流量计 壁面压力 数值模拟 旋涡脱落 

分 类 号：TH814[机械工程—仪器科学与技术]