管内速度分布的不对称性对均速管流量计测量精度影响的数值研究  

Numerical study on the influence of asymmetry of velocity distribution on measurement accuracy in averaging pitot tube

作　　者：钟兴林 张文康 朱亚斌 杨雪峰[1] Zhong Xinglin;Zhang Wenkang;Zhu Yabin;Yang Xuefeng(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院

出　　处：《云南化工》2019年第3期14-18,共5页Yunnan Chemical Technology

摘　　要：针对速度分布的不对称性对均速管流量计测量精度影响的问题,利用计算流体力学(CFD)软件,对均速管流量计的内部流场进行了3D数值模拟。采用有限体积法,引入标准k-epsilon湍流模型对控制方程进行离散和求解,得出了均速管流量计在弯管后不同直管段位置和不同流速条件下的流场动力学参数;利用得到的差压模拟数据计算得出流量系数,并对测量精度进行了分析。Aiming at the problem that the influence of asymmetry of velocity distribution on measurement accuracy, a 3D numerical simulation of the internal flow field of the averaging pitot tube is carried out by using the computational fluid dynamics (CFD) software.By using the finite volume method, the standard k-epsilon turbulence model is introduced to discretize and solve the control equation, the dynamic parameters of the flow field of the averaging pitot tube under different straight pipe segments and different flow velocity after elbow pipe are obtained, the flow coefficient are calculated by using the differential pressure obtained from the simulation, and the measurement accuracy is analyzed.

关 键 词：均速管流量计 数值仿真 流量系数 

分 类 号：TH814[机械工程—仪器科学与技术] O357.5[机械工程—精密仪器及机械]