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基于流动型定压比热容测量方法,本文设计了一套适用于高压低温的碳氢燃料定压比热测量系统,温度测量范围:233.45~313.65 K,最高压力达到10 MPa,测量定压比热容的扩展相对不确定度为1.24%~2.20%(置信因子k=2)。实验在通过纯物质正己烷和质量比1:1正庚烷-正辛烷二元混合物对测量系统可靠性进行验证的基础上,测试了3种碳氢燃料A、B、C压力:0.7、1.5、3和6 MPa,温度:233.45~313.65 K的比热值,结果表明:3种燃料在4种压力下,定压比热分别随温度的增加而增加;在低温区,燃料A、B受温度的影响程度要小于燃料C;压力基本不影响碳氢燃料低温定压比热。该低温高压比热测量系统的建成为进一步开展碳氢化合物及其混合物低温定压比热的研究创造了条件。
Based on the flow-based constant pressure specific heat capacity measurement method, this paper designed a set of specific pressure and temperature measurement system of hydrocarbon fuel suitable for high pressure and low temperature. The measurement range of temperature is 233.45 ~ 313.65 K and the maximum pressure is 10 MPa. The relative uncertainty is 1.24% ~ 2.20% (confidence factor k = 2). Experiments were carried out to verify the reliability of the measurement system by using n-hexane and n-heptane-n-octane binary mixtures with pure substance, and the pressures of A, B and C of three kinds of hydrocarbon fuels were tested: 0.7, 1.5, 3, 6 MPa and temperature: 233.45 ~ 313.65 K. The results showed that the specific heat of constant pressure increased with the increase of temperature under the four kinds of pressure, Affected by the temperature less than the fuel C; pressure does not affect the basic low-temperature hydrogenated hydrocarbon specific heat. The establishment of the low temperature and high pressure specific heat measurement system has opened the door to further study on the specific heat of low temperature and constant pressure of hydrocarbons and their mixtures.