液体推进燃料着火特性影响因子与活化能分析

采用反射激波管实验台，对液体推进燃料RP-3着火特性进行了实验研究，并分析了燃料的表观活化能。采用了最大OH-光谱斜率倒推法确定着火终点，判定得到了液体推进燃料的着火特性，并对不同燃料体积分数下的着火延迟进行了归一化处理。结果表明:推进燃料的表观活化能差异不大，约为154～171kJ/mol；对各参数影响因子进行分析，着火延迟时间与当量比成正比关系，与燃料体积分数和混合气压力成反比关系；与JP-10比较发现，着火特性数据受燃料体积分数、当量比的影响因子几乎相等。 

Analysis of impact factor of ignition characteristics and activation energies about liquid propulsion fuel

The combustion efficiency and pollution emission of real fuel were improved by studying the ignition delay time of fuel. The ignition characteristics of RP-3 were accomplished by applying reflected shock wave in the shock tube and the apparent activation energies were analyzed. The endpoints of ignition were judged by means of retrodicting the maximum OH- spectrum curves to the basic values. The normalizations of auto ignition characteristics about different volume fractions were conducted. Result showed that, the normalizing data appeared good concentration in the chart. The apparent activation energies of RP-3 varied little about 154-171kJ/mol in different operating conditions. There was a positive correlation between the ignition delay time and the equivalence ratio or fuel volume fraction in the mixture, but there was a negative correlation between it and the pressure of mixture. The index impact factors about fuel volume fraction and pressure between RP-3 and JP-10 were roughly equal.