气相声速测量偏差对导出热力学性质的影响

doi:10.3969/j.issn.0438-1157.2014.04.002

化工学报

气相声速测量偏差对导出热力学性质的影响

刘强¹, 冯晓娟², 段远源¹

1 清华大学热科学与动力工程教育部重点实验室, 二氧化碳资源化利用与减排技术北京市重点实验室, 北京 100084;
2 中国计量科学研究院热工计量科学研究所, 北京 100013

收稿日期:2013-08-13 修回日期:2013-10-08 出版日期:2014-04-05 发布日期:2013-12-10
通讯作者: 段远源
作者简介:刘强（1981—），男，博士。
基金资助:
国家自然科学基金项目（51236004，51106143）。

Effects of measurement deviation in gaseous speed of sound on derived thermodynamic properties

LIU Qiang¹, FENG Xiaojuan², DUAN Yuanyuan¹

1 Key Laboratory for Thermal Science and Power Engineering, Ministry of Education, Beijing Key Laboratory for CO₂ Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China;
2 Division of Thermophysics and Process Measurements, National Institute of Metrology, Beijing 100013, China

Received:2013-08-13 Revised:2013-10-08 Online:2014-04-05 Published:2013-12-10
Supported by:
supported by the National Natural Science Foundation of China (51236004, 51106143).

摘要/Abstract

摘要： 气相声速是测量准确度最高的热物性之一，并可以导出理想气体比定压热容和第二维里系数等其他热力学性质。分析了定程干涉法中存在的系统偏差，建立了绝对系统偏差（δ_FAE）和相对系统偏差（δ_FFE）对导出热力性质影响的数学模型，并开展了模拟计算。研究结果表明，理想气体比热容比受绝对系统偏差的影响为2δ_FAE，但是绝对系统偏差对多原子气体的理想气体比定压热容的影响大，可高于-100δ_FAE，且温度越高，影响越大；相对系统偏差主要影响声速维里系数，在温度和相对系统偏差相同时，不同工质的第二声速维里系数的绝对变化量相同。绝对系统偏差和相对系统偏差在导出第二维里系数中的影响较小。

关键词: 热力学性质, 模拟, 测量, 气相声速, 维里系数, 理想气体比热容, 定程干涉法

Abstract: Gaseous speed of sound is an important thermophysical property measured with high precision. The ideal gas heat capacity and the second virial coefficient can be derived from the speed of sound. The systematic errors in measurements of sound speed using fixed path interferometers are analyzed. Mathematic modes are proposed for the influences of fixed absolute error (δ_FAE) and fixed fractional error (δ_FFE) on thermodynamic properties derived from gaseous speed of sound. The influences from the errors in measurements are also simulated. The results show that the heat capacity ratio of ideal gas varies with 2δ_FAE by the effect of the fixed absolute error, but the influence on isobaric heat capacity of ideas gas may be higher than -100δ_FAE and increases with temperature for polyatomic gas. The second acoustic virial coefficient is affected by the fixed fractional error. Substances have the same absolute deviations in the second acoustic virial coefficients at the same temperature and fixed fractional error. The influences of fixed absolute error and fixed fractional error on the second virial coefficients are lower.

Key words: thermodynamic properties, simulation, measurement, gaseous speed of sound, virial coefficient, ideal gas heat capacity, fixed path interferometer

中图分类号:

TK123

刘强, 冯晓娟, 段远源. 气相声速测量偏差对导出热力学性质的影响[J]. 化工学报, DOI: 10.3969/j.issn.0438-1157.2014.04.002.

LIU Qiang, FENG Xiaojuan, DUAN Yuanyuan. Effects of measurement deviation in gaseous speed of sound on derived thermodynamic properties[J]. CIESC Journal, DOI: 10.3969/j.issn.0438-1157.2014.04.002.

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气相声速测量偏差对导出热力学性质的影响

Effects of measurement deviation in gaseous speed of sound on derived thermodynamic properties

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