正癸烷燃烧骨架反应机理构建与验证  

Construction and Verification of n-Decane Combustion Skeleton Reaction Mechanism

作　　者：李延吉[1] 马婕 曾文 常亚超[3] LI Yanji;MA Jie;ZENG Wen;CHANG Yachao(Key Laboratory of Clean Energy in Liaoning,Shenyang Aerospace University,Shenyang,China,110136;School of Aero-engine,Shenyang Aerospace University,Shenyang,China,110136;Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian,China,116024)

机构地区：[1]沈阳航空航天大学辽宁省清洁能源重点实验室,辽宁沈阳110136 [2]沈阳航空航天大学航空发动机学院,辽宁沈阳110136 [3]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116024

出　　处：《热能动力工程》2024年第12期104-112,127,共10页Journal of Engineering for Thermal Energy and Power

基　　金：沈阳市科学技术计划项目(21108926)。

摘　　要：为了研究航空煤油中正癸烷燃料的氧化和燃烧特性,缩小反应机理规模,本文对正癸烷开展了化学反应动力学机理的系统简化。采用基于反应类的全局敏感性分析法及路径敏感性分析法,结合产率分析法,识别正癸烷大分子子机理中的关键反应类并选出其中具有代表性的反应,并基于解耦法将骨架子机理与C_(0)-C_(3)子机理耦合,形成正癸烷的初始骨架机理。利用遗传算法在不确定度范围内针对点火延迟时间和燃料、C_(O)和CO_(2)摩尔分数对燃料子机理的反应速率系数进行优化,提高骨架机理的准确性,最终得到一个包含48种组分和209个化学反应的正癸烷骨架机理。计算结果表明:正癸烷燃烧骨架反应机理在较宽的工况范围内对正癸烷燃烧过程中层流燃烧速度、着火延迟时间及重要组分浓度的预测具有较高的准确性。In order to study the oxidation and combustion characteristics of n-decane fuel in aviation kerosene and to reduce the scale of the reaction mechanism,the kinetic mechanism of n-decane chemical reaction was systematically simplified in this paper.Reaction class-based global sensitivity analysis and path sensitivity analysis methods combined with rate of production analysis method were used to identify key reaction classes in the sub-mechanism of n-decane macromolecules and select representative reactions.Based on the decoupling method,the skeleton sub-mechanism was coupled with the C_(0)-C_(3) submechanism to form the initial skeleton mechanism of n-decane.According to the ignition delay time and the mole fraction of fuel,C_(O) and CO_(2),genetic algorithm was used to optimize the reaction rate coefficients of the fuel sub-mechanism in the range of uncertainty,so as to improve the accuracy of the skeleton mechanism.Finally,an n-decane skeleton mechanism containing 48 species and 209 chemical reactions was obtained.The results show that the reaction mechanism of n-decane combustion skeleton has high accuracy in predicting laminar burning speed,ignition delay time and concentration of important components in a wide range of operating conditions.

关 键 词：正癸烷 机理简化 骨架机理 层流燃烧速度 着火延迟时间 

分 类 号：V312.1[航空宇航科学与技术—航空宇航推进理论与工程]