RP-3航空煤油着火特性的影响因素分析

Influencing Factor Analysis for Ignition Characteristics

关键词:  着火延迟时间  RP-3航空煤油  实验研究  影响因素

Key words:  Ignition delay time  RP-3 kerosene  Experimental study  Effect factor

摘要:

为了获得RP-3航空煤油着火特性的实验数据，建立该燃料的化学反应动力学模型，在化学激波管中利用反射激波点火，采用壁面压力与OH自发光作为着火指示信号，对RP-3航空煤油/氧气/氩气混合气在着火温度范围为1100~1600K，压力分别为0.1，0.2与0.3MPa，当量比分别为0.5，1.0与1.5，燃料摩尔分数分别为0.25%，0.5%与0.75%时的着火延迟时间进行了实验测量；分析了着火温度、压力、当量比以及燃料摩尔分数等对混合气着火延迟时间的影响，拟合得到了上述工况下混合气着火延迟时间的Arrhenius的关系式，并与相关实验结果进行了对比分析。结果表明，在不同压力或不同当量比下，混合气着火延迟时间的对数与着火温度呈直线关系；随着着火温度、压力与燃料摩尔分数的升高以及当量比的降低，混合气的着火延迟时间逐渐缩短。

Abstract:

In order to obtain the experimental data of ignition characteristics of RP-3 kerosene and establish the reaction kinetic model of this fuel，the ignition delay time of RP-3 kerosene/oxygen/Ar mixtures over the temperature range of 1100~1600K，at pressure of 0.1，0.2 and 0.3MPa，at equivalence ratios of 0.5，1.0 and 1.5，and for fuel mole fractions of 0.25%，0.5% and 0.75%，respectively，were measured behind reflected shock waves，using side-wall pressure and OH auto-luminescence signals measurements in a chemical shock tube. The effects of ignition temperature，pressure，equivalence ratio and mole fraction of fuel on the ignition delay time were investigated，the Arrhenius correlations for the ignition delay time of the mixture under the above conditions were also deduced，and comparisons with related experimental results were presented. The results show that the correlation for the logarithm of the ignition delay time of the mixture and ignition temperature is linear under different pressure or different equivalence ratios. With the ignition temperature，pressure and mole fraction of fuel increasing and the equivalence ratio decreasing，the ignition delay time of the mixture is shortening.