RP-3航空煤油物理替代燃料模型及应用研究

针对现有物理替代燃料构建方法需要大量实验数据来完成多目标优化计算,导致替代燃料构建成本过高的问题,提出了基于分子结构相似来构建物理替代燃料的方法。基于直接匹配分子结构和官能基团的思路,构建了一个能描述RP-3航空煤油主要物理性质的三元替代燃料模型。以正十二烷、2,5-二甲基己烷和甲苯为基础燃料,用以匹配目标燃料的四种官能基团:CH_3,CH_2,CH和苯基。在不同压力、温度条件下测试了替代燃料模型计算密度、黏度、比热容和导热系数等物性参数的精确性,结果表明该替代燃料模型能很好地反映RP-3航空煤油在亚临界到超临界状态下的主要物理性质。最后将得到的替代燃料模型应用于管道对流换热数值模拟中,用以模拟航空煤油再生冷却过程。模拟值与实验值吻合良好,证明了本文替代燃料构建方法的有效性和实用性。

A Physical Surrogate Fuel Model for RP-3 Aviation Kerosene and Applications

In order to solve the problem that spend too much time and work to measure experimental data and calculate optimal functions in traditional surrogate fuel methods, a three-component surrogate for emulating the physical characteristics of RP-3 aviation kerosene has been developed by the methodology of directly matching the molecular structure and functional groups. The components of n-dodecane, 2,5-dimethylhexane and toluene were chosen to provide comparable molecular sizes and the representative functional groups, , , and phenyl of the target fuels. Several important physical properties including density, specific heat capacity, viscosity and thermal-conductivity of present surrogate fuel were validated under different temperature and pressures covering sub- and supercritical conditions. The present surrogate fuel model was also used in the numerical simulations of a tube flow, which mimic the process of regenerative cooling. The effectiveness and practicability of the present surrogate fuel were also validated by the comparisons between the simulation and experiment results.