RP-3航空煤油替代燃料骨架机理开发及验证

Development and Validation of a Surrogate Fuel Skeletal Mechanism for RP-3 Aviation Kerosene

基于航空煤油理化特性及燃烧条件,选取质量分数分别为73%正十二烷、14.7%1,3,5-三甲基环己烷、12.3%正丙基苯作为RP-3航空煤油的替代燃料,同时添加关键低温反应通道,使替代模型能够满足宽范围条件下的燃烧性能。采用敏感度分析简化方法得到包含86个物种和318个反应的骨架机理。利用Chemkin-Pro模拟了机理在多种工况下的点火延迟时间、层流火焰速度和重要物种浓度,并与实验数据进行对比验证,结果表明86个物种和318个反应的简化机理能够较好描述航空煤油的关键燃烧特性。元素流动分析和强制敏感度分析的结果表明,机理保留了关键物种和反应路径,具有较高保真度。该机理尺寸较小且包含低温反应通道,可用于航空发动机燃烧过程数值模拟,进一步探究航空燃料在工程应用中的实际问题。

Based on the physicochemical properties and combustion conditions of real aviation kerosene,a three-component surrogate fuel containing 73%n-dodecane,14.7%1,3,5-trimethylcyclohexane,and 12.3%n-propylbenzene is proposed in this paper.At the same time,key low-temperature reactions are added to make the surro-gate model suitable for combustion performance under low-temperature conditions.A skeletal mechanism containing 86 species and 318 reactions is achieved with the sensitivity analysis(SA)reduction method.The skeletal mecha-nisms are further verified by comparing important combustion characteristics such as ignition delay time,laminar flame speed,and important species concentration with those of experimental data.The results showed that the 86 spe-cies mechanism can reasonably describe the key combustion characteristics of aviation kerosene.The results of ele-ment flow analysis and brute force sensitivity analysis indicate that the mechanism retains key species and reaction pathways.The mechanism has a smaller size and includes low-temperature reactions,which can be used for combus-tor numerical simulation of aviation engines,further exploring practical problems of aviation fuel application in engine.