超临界压力正癸烷定压比热测量

推进技术 ›› 2017, Vol. 38 ›› Issue (1): 214-219.

超临界压力正癸烷定压比热测量

张筱喆^1,2,闻洁¹,徐国强¹,张楠¹,贾洲侠¹

北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191; 沈阳发动机设计研究所，辽宁沈阳 110015,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191

发布日期:2021-08-15
作者简介:张筱喆，男，硕士生，研究领域为工程热物理。
基金资助:
国家自然科学基金(50676005)。

Isobaric Specific Heat Capacity Measurements of n-Decane at Super-Critical Pressures

National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering Beihang University，Beijing 100191，China; Shenyang Engine Design and Research Institude，Shenyang 110015，China,National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering Beihang University，Beijing 100191，China,National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering Beihang University，Beijing 100191，China,National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering Beihang University，Beijing 100191，China and National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering Beihang University，Beijing 100191，China

Published:2021-08-15

摘要/Abstract

摘要： 为了准确测量高温高压条件下燃油的定压比热，基于定压比热与焓值的关系，提出一种适用于测量高温高压流体定压比热的方法并设计相应的实验装置，该方法可以显著地减小热损失测量误差对测量结果的影响，提高比热测量精度。经过误差分析，在常温至800K范围内，该方法具有最大3.7%的相对不确定度。利用该方法对正癸烷的定压比热(3MPa和5MPa，312～797K)进行了标定实验，实验结果表明，定压比热测量的平均偏差小于1.8%，拟临界点附近最大偏差7.6%，其它温度范围最大偏差不超过4.3%。对3MPa和5MPa下675～797K的正癸烷定压比热数据进行了补充。该方法同样适用于其它流体在该温度范围内的定压比热测量。

关键词: 定压比热；测量；正癸烷；热物性；超临界

Abstract: In order to measure the isobaric specific heat capacity([cp])of hydrocarbon fuels at high temperature and high pressure conditions accurately，a new experimental method and device were developed based on the relation between[cp]and enthalpy. The influence of heat loss on the measurement accuracy can be reduced significantly based on this method. The relative uncertainty of the method for isobaric heat capacity measurements is 3.7% in the temperature range of 300K to 800K according to the uncertainty analysis. Validation experiments were conducted by measuring the[cp]of n-decane(3MPa and 5MPa，312～797K). The test results indicate that the average absolute deviation(AAD)is below 1.8%，and the maximum absolute deviation(MAD)is 4.3%，excluding the pseudo-critical region where the MAD is 7.6% due to sharp variations of isobaric heat capacity. Test results are tabulated in the temperature range of 675K to 797K on 3MPa and 5MPa，which extended the data range of existing data. This method can be also applied to other fluids in similar operating conditions.

Key words: Isobaric specific heat capacity；Measurement; n-decane；Thermophysical properties；Super-critical

张筱喆,闻洁,徐国强,张楠,贾洲侠. 超临界压力正癸烷定压比热测量[J]. 推进技术, 2017, 38(1): 214-219.

ZHANG Xiao-zhe^1,2,WEN Jie¹,XU Guo-qiang¹,ZHANG Nan¹,JIA Zhou-xia¹. Isobaric Specific Heat Capacity Measurements of n-Decane at Super-Critical Pressures[J]. Journal of Propulsion Technology, 2017, 38(1): 214-219.

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