计量学报2025，Vol.46Issue(3)：368-375,8.DOI:10.3969/j.issn.1000-1158.2025.03.09
高压临界流文丘里喷嘴气体流量标准装置温度场测量与分析
Temperature Field Measurement and Analysis of High-pressure Critical Flow Venturi Nozzle Gas Flow Standard Device
摘要
Abstract
Based on the high-pressure gas source,a high-pressure critical flow Venturi nozzle(CFVN)gas flow standard device was established.In the calibration experiment of small flow rate,the temperature field distribution upstream of the standard CFVN array has an important influence on the measurement uncertainty.Aiming at the temperature field upstream of the standard CFVN array,in the calibration experiment of the CFVN with throat diameter of 8.251 mm,the temperature field distribution characteristics of three different standard CFVN array combinations and different flow rates were analyzed and compared.The experimental results show that the maximum temperature difference upstream of the standard CFVN array is 1.97 K at a small flow rate,with the increase of the flow rate in the tube,the unevenness of the temperature field distribution decreases;the maximum temperature difference in the upstream of the array varies from 1.10 K to 1.97 K under three different combinations of standard CFVN arrays.Therefore,in order to improve the measurement accuracy of stagnation temperature,it is necessary to optimize the temperature measurement method under small flow rate.关键词
流量计量/临界流文丘里喷嘴/流量标准装置/温度场分布/流出系数Key words
flow metrology/critical flow venturi nozzle/gas flow standard device/temperature field distribution/discharge coefficient引用本文复制引用
张郅豪,赵佳锡,章荣平,覃晨,刘婷婷..高压临界流文丘里喷嘴气体流量标准装置温度场测量与分析[J].计量学报,2025,46(3):368-375,8.基金项目
国家自然科学基金(52306056) （52306056）
