RP-3航空煤油层流燃烧特性的实验

为了阐明RP-3航空煤油的燃烧特性,在定容燃烧反应器中实验测量了初始压力分别为0.1,0.3,0.5,0.7MPa、初始温度分别为390,420,450K、当量比范围为0.6~1.6时,RP-3航空煤油的层流燃烧速度与马克斯坦长度,分析了初始温度、压力以及当量比对火焰发展结构、层流燃烧速度及马克斯坦长度的影响.结果表明:随着初始温度的升高或初始压力的降低,RP-3航空煤油的层流燃烧速度逐渐升高;随着当量比由0.6升高至1.6,层流燃烧速度呈现先增加后降低的趋势,当当量比为1.2时,层流燃烧速度最大.随着初始压力或当量比的降低,马克斯坦长度逐渐增大,火焰稳定性增强;初始温度对马克斯坦长度的影响不明显,当当量比为0.9~1.1时,随着初始温度的升高,马克斯坦长度逐渐减小,但当当量比为1.2~1.5时,马克斯坦长度则有所增大. 

Experiment on laminar combustion characteristics of RP-3 kerosene

In order to illustrate the combustion characteristics of RP-3 kerosene, the laminar combustion velocity and Markstein length of RP-3 kerosene were investigated experimentally in a constant volume combustion bomb.The experiments were performed at four different pressures:0.1, 0.3, 0.5 and 0.7MPa, three different temperatures:390, 420 and 450K, and over the equivalence ratio range of 0.6-1.6.The influences of three crucial parameters:initial temperature, initial pressure and equivalence ratio on the flame structure, laminar combustion velocity and Markstein length were investigated.The results showed that increasing the initial temperature or decreasing the initial pressure could lead to an increase in the laminar combustion velocity of RP-3 kerosene.With the equivalence ratio increasing from 0.6 to 1.6, the laminar combustion velocity increased initially and then decreased gradually.The highest laminar combustion velocity was measured at fuel rich condition (equivalence ratio of 1.2).Furthermore, decreasing the initial pressure or equivalence ratio could increase the stability of the flame front, which is established by increased Markstein length.The effect of the initial temperature on the Markstein length is not clear; with the increase of the initial temperature, the Markstein length has a decreasing trend at some conditions for the equivalence ratios of 0.9-1.1, and an increasing trend over the equivalence ratios range of 1.2-1.5.