航空煤油替代燃料模型热物性

研究基于国产航空煤油RP-3液相组分数据,提出了单组分、简化3组分和详细13组分3种替代燃料模型,并对采用3组分替代模型计算得到的燃料密度、黏度、导热率、比热容4个热物性参数进行了在不同温度(300~1 000K)和压力(1~15MPa)状态下的分析.结果表明,燃料的物性在超临界压力下,随着温度升高,密度减小,黏性降低,热导率则先降后增,而比热容逐渐增大,同时,在拟临界温度附近,燃料热物性均发生变化剧烈,比热容在不同压力下对应不同峰值点,在3MPa下最大;压力的变化会使得拟临界温度发生改变,给密度的变化程度、比热容的峰值分布和热导率的大小带来一定的影响.采用3组分替代模型预测燃料热沉,经实验验证,其物理热沉吻合较好.

Thermo-physical properties for surrogate models of aviation kerosene

Based on the liquid-phase product analysis of aviation kerosene RP-3, three kinds of surrogate models, including single-specie, three-species and 13-species surrogate were proposed. The investigations covered the temperatures ranged from 300 to 1000K under the pressures from 1 to 15MPa. The distributions of the four thermo-physical properties were calculated under supercritical pressure conditions with temperature rise and decrease in density, viscosity and thermal conductivity, as well as specific heat increase. Drastic changes of thermo-physical properties occurred near the pseudo-critical temperature, especially for the specific heat under the pressure of 3MPa. The variation in pressure will change critical temperature location and has a certain influence on distributions of density and thermal conductivity, as well as the peak value of specific heat. The heat sink of RP-3 calculated from the three-species surrogate is in good agreement with the experiments.