高压天然气喷嘴标准装置不确定度评定及验证
Uncertainty evaluation and verification of the standard device for high pressure natural gas nozzles
郭婧 1赵永辉 1吕承泽1
作者信息
- 1. 国家管网集团北京管道有限公司,北京 102606
- 折叠
摘要
文章分析了某天然气检定站临界流文丘里喷嘴标准装置的实流校准结果,探讨了三种流出系数拟合方法,验证了 PTB公式在高雷诺数下结果的准确性.同时建立了装置的数学模型,综合考虑了流出系数、滞止压力、滞止温度、摩尔质量和压缩因子等因素,评定了该装置的扩展不确定度为0.22％(k=2),通过中国计量科学研究院的测量审核,验证了该标准装置的不确定度水平.
Abstract
In this paper,the results of the real flow calibration of the critical flow venturi nozzle stand-ard device of a natural gas verification station are analyzed,and three fitting methods of the outflow coef-ficient are discussed,which verifies the accuracy of the PTB formula under high Reynolds number.At the same time,the mathematical model of the device was established,and the extended uncertainty of the device was evaluated as 0.22％(k=2)by comprehensively considering the outflow coefficient,stag-nant pressure,stagnation temperature,molar mass and compression factor,and the uncertainty level of the standard device was verified by the measurement audit of the Chinese Institute of Metrology.
关键词
临界流文丘里喷嘴/流出系数/数学模型/不确定度评定Key words
critical flow venturi nozzles/outflow coefficient/mathematical modeling/uncertainty rating引用本文复制引用
出版年
2024
NETL
NSTL
万方数据