恒定壁温pVTt标准容器气体质量数值模拟与实验  

Numerical Simulation and Experiment of Gas Mass in pVTt Standard Containerunder Isothermal Boundary Condition

作　　者：刘若璇 朱洺征 沈昱明[1] LIU Ruo-xuan;ZHU Ming-zheng;SHEN Yu-ming(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 20093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《计量学报》2020年第2期179-184,共6页Acta Metrologica Sinica

摘　　要：以36 m^3卧式pVTt标准装置为研究对象,采用恒定壁温、恒定流速入口边界条件,对容器中气体进气过程和均匀过程进行了数值模拟与实验;提出了一种新的计算pVTt标准容器内平均温度的算法,即质量平均温度算法。模拟结果显示,在进气后自然对流过程中,容器内气体质量平均温度T珘随时间呈抛物线状缓慢下降,并趋于壁温;而平均压力则急剧下降,并很快达到均匀。通过数值模拟与实验验证,发现容器中的气体质量与lnT满足线性关系。Focusing on a 36 m^3 horizontal pVTt standard container,the intake process and homogeneous process of the gas in the container were numerically simulated in constant wall temperature and constant velocity as the inlet boundary condition. A new algorithm for calculating the average temperature in the standard p VTt container was proposed,whose name was mass temperature average. The simulation results showed that in the natural convection process after gas intake,the average mass temperature of the gas in the container slowly decreased with time in parabolic shape and tended to wall temperature,while the average pressure drops sharply and quickly reached uniformity. Through numerical simulation and experimental verification,it was found that the gas mass in the container was linear with ln T.

关 键 词：计量学 PVTT 恒定壁温 质量平均温度 气体质量 标准容器 

分 类 号：TB937[一般工业技术—计量学]