乙烷及乙烷+丙烷低温比定压热容实验研究  

Experimental Study on Isobaric Specific Heat Capacity of Ethane and Ethane+Propane at Low Temperature

作　　者：盛勃闻 赵延兴 董学强[1,2,3] 公茂琼 SHENG Bowen;ZHAO Yanxing;DONG Xueqiang;GONG Maoqiong(Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;State Key Laboratory of Technologies in Space Cryogenic Propellants,Beijing 100028,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]航天低温推进剂技术国家重点实验室,北京100028 [3]中国科学院大学,北京100049

出　　处：《工程热物理学报》2024年第9期2572-2579,共8页Journal of Engineering Thermophysics

基　　金：中国科学院特别研究助理资助项目(No.E3AKD102);航天低温推进剂技术国家重点实验室开放课题(No.E2AW0201)。

摘　　要：本文研制了一套用于低温比定压热容(c_(p))测量的流动量热计,该量热计由恒温浴系统、流动系统、量热池和数据采集系统四部分组成,可实现115~340 K温度范围内的比定压热容测量,压力可达8 MPa。温度T、压力p及比定压热容c_(p)测量不确定度分别为11 mK,0.02 MPa及0.9%。基于该量热计实测了45个丙烷、30个异丁烷、5个乙烷及5个乙烷+丙烷二元混合物的低温液相比定压热容数据,实测数据与高精度亥姆霍兹状态方程的计算值和呈现了较好的一致性,丙烷、异丁烷、乙烷及乙烷+丙烷的平均绝对相对偏差分别为0.26%、0.32%、0.31%及0.38%,验证了该装置的可靠性。In this paper,a flow calorimeter was developed for the measurement of isobaric specific heat capacity(c_(p))at low temperature.The calorimeter was composed of four parts:thermostatic bath,flow system,calorimeter and data acquisition system.The calorimeter can measure the c_(p)in the temperature range of 115∼340 K,and the pressure can reach 8 MPa.The uncertainty of temperature,pressure and heat capacity were 11 mK,0.02 MPa and 0.9%,respectively.The c_(p)data of propane,isobutane,ethane and ethane+propane binary mixtures at low temperature were measured.The measured data showed a good agreement with the calculated values of high-precision Helmholtz equation of state.The average absolute relative deviations of propane,isobutane,ethane and ethane+propane was 0.26%,0.32%,0.31%and 0.38%,respectively,which verified the reliability of the device.

关 键 词：低温流动量热计 比定压热容 乙烷(R170) 丙烷(R290) 异丁烷(R600a) 

分 类 号：TK123[动力工程及工程热物理—工程热物理]