RP-3航空煤油层流燃烧特性的影响因素

Effect factor of laminar burning characteristics of RP-3 kerosene

为了获得RP-3航空煤油燃烧特性的主要影响因素,在定容燃烧弹中试验测量了初始温度范围为390~450K、初始压力范围为0.1~0.7MPa、当量比范围为0.6~1.5条件下RP-3航空煤油的火焰发展特性,并分析了RP-3航空煤油火焰稳定性与层流燃烧速率的主要影响因素。结果表明:无拉伸火焰传播速率与层流燃烧速率随初始压力的升高或初始温度的降低而逐渐降低,但燃烧压力峰值却逐渐升高;随当量比的升高,无拉伸火焰传播速率、层流燃烧速率与燃烧压力峰值呈现先增加后降低的趋势,无拉伸火焰传播速率与层流燃烧速率在当量比为1.2时达到最大,燃烧压力峰值在当量比为1.0达到最大;马克斯坦长度随当量比的增加或初始压力的升高而逐渐变小,火焰前锋面稳定性变差,但是,初始温度对马克斯坦长度的影响不确定。

In order to gain the main effect factors of burning characteristics of RP-3 ker- osene, the flame propagation characteristics of RP-3 kerosene over the initial temperature range of 390--450K, the initiM pressure range of 0.1--0.7 MPa, and the equivalence ratio range of 0.6--1.5 were measured in the constant volume combustion bomb. Furthermore, the main effect factors of the flame stability and laminar burning velocity of RP-3 kerosene were investigated. The results showed that increasing the initial pressure or decreasing the initial temperature led to a decrease in the unstretched flame propagation velocity and the laminar burning velocity, and an increase in the maximum burning pressure of RP-3 kero- sene. With the increase of equivalence ratio, the unstretched flame propagation velocity, the laminar burning velocity and the maximum burning pressure increased initially and then de- creased gradually. The highest unstretched flame propagation velocity and the laminar burn- ing velocity were measured when the equivalence ratio was 1.2 and the maximum burning pressure was measured when the equivalence ratio was 1.0. Furthermore, increasing the equiv- alence ratio or the initial pressure decreased the Markstein length and the stability of the flame front. However, the effect of the initial temperature on the Markstein length was uncertain.