摘要
依托高压气源,建立了高压临界流文丘里喷嘴气体流量标准装置。在小流量的校准实验中,标准临界流文丘里喷嘴(CFVN)阵列上游的温度场分布对测量不确定度具有重要影响。针对标准CFVN阵列上游的温度场,在喉径8.251 mm CFVN的校准实验中,分析和对比了3种不同标准CFVN阵列组合方式以及不同流量下的温度场分布特性。实验结果表明:小流量下,标准CFVN阵列上游的最大温差为1.97 K,随着管内流量增加,温度场分布不均匀性降低;3种不同标准CFVN阵列组合方式下,阵列上游最大温差在1.10~1.97 K之间变化。因此,为提高滞止温度测量精度,需要优化小流量下的温度测量方法。
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.
作者
张郅豪
赵佳锡
章荣平
覃晨
刘婷婷
ZHANG Zhihao;ZHAO Jiaxi;ZHANG Rongping;QIN Chen;LIU Tingting(School of Information Engineering,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Key Laboratory of Aerodynamic Noise Control,China Aerodynamic Research and Development Center,Mianyang,Sichuan 621000,China)
出处
《计量学报》
北大核心
2025年第3期368-375,共8页
Acta Metrologica Sinica
基金
国家自然科学基金(52306056)。
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
flow metrology
critical flow venturi nozzle
gas flow standard device
temperature field distribution
discharge coefficient
作者简介
第一作者:张郅豪(2000-),男,四川德阳人,西南科技大学信息工程学院研究生,研究方向为高精度气体流量测量。Email:zzhmy901@163.com;通讯作者:赵佳锡(1993-),男,甘肃武威人,中国空气动力研究与发展中心助理研究员,博士,主要从事气动噪声测量技术研究。Email:zhaojx0801@foxmail.com。
