煤直接液化航空煤油自着火特性实验及动力学研究  

Experimental and kinetic study on autoignition characteristics of direct coal liquefaction aviation kerosene

作　　者：武颖韬 孔祥东 王新辉 梁金虎 汤成龙[1] 黄佐华[1] 汪必耀 曾萍 WU Yingtao;KONG Xiangdong;WANG Xinhui;LIANG Jinhu;TANG Chenglong;HUANG Zuohua;WANG Biyao;ZENG Ping(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Environmental and Safety Engineering,North University of China,Taiyuan 030051,China;The Second Research Institute of CAAC,Chengdu 610041,China;Civil Aviation Fuel&Chemical Airworthiness Certification Center of CAAC,Chengdu 610041,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]中北大学环境与安全工程学院,山西太原030051 [3]中国民航局第二研究所,四川成都610041 [4]中国民用航空航油航化适航审定中心,四川成都610041

出　　处：《推进技术》2024年第8期104-111,共8页Journal of Propulsion Technology

基　　金：航空发动机及燃气轮机基础科学中心项目(P2022-C-II-004-001);国家自然科学基金(12172335);国家自然科学基金委员会-中国民用航空局民航联合研究基金(U2133215)。

摘　　要：煤直接液化(DCL)航空煤油含有大量的环烷烃,与传统航空煤油成分差异较大,研究DCL煤油的着火特性及反应动力学对于深入认识其燃烧性能及其推广应用具有重要意义。因此,本文使用快速压缩机测量了DCL煤油,RP-3煤油及其混合物在不同当量比和压力下的着火延迟期,对比了DCL与RP-3煤油的燃烧放热及相对反应活性,分析了二者低温反应活性差异的动力学机制。使用实验数据验证了文献中DCL煤油的化学反应动力学模型,并通过构建替代物组分中正戊基环己烷的化学反应机理,提高了模型对DCL煤油着火延迟和高温裂解产物的预测性能。研究结果表明,DCL煤油的着火放热量更高,其着火延迟期在高温下(>1000 K)与RP-3接近,而在低温下(<750 K)则略高于RP-3。DCL煤油中大量的环烷烃成分阻碍了燃料分子低温链分支反应的进行,抑制了其低温反应活性,有利于降低燃料进入主燃区前发生自燃的倾向。Direct coal liquefaction(DCL)aviation kerosene contains a large amount of cycloalkanes,which is significantly different from traditional aviation kerosene.Studying the ignition characteristics and reac⁃tion kinetics of DCL kerosene is of great significance for a deeper understanding of its combustion performance and application.Therefore,in this paper,the ignition delay times of DCL kerosene,RP-3,and their mixture at different equivalence ratios and pressures were measured utilizing a rapid compression machine.The combustion heat release and relative reactivity of DCL and RP-3 kerosene were compared,and the kinetic mechanism of the difference in low-temperature reactivity between two kinds of kerosene was analyzed.The chemical kinetic model of DCL kerosene in the literature was validated using the experimental data,and the prediction performance was significantly improved for the ignition delay times and pyrolysis products by developing the sub mechanism of npentylcyclohexane,one major component of the surrogate model.This study shows that DCL kerosene releases more heat after ignition,and its ignition delay time is similar to that of RP-3 at high temperatures(>1000 K),while slightly higher than that of RP-3 at low temperatures(<750 K).The presence of the large amount of cyclo⁃alkanes hinders the low-temperature chain branching reactions,inhibiting the low-temperature activity and re⁃ducing the tendency of spontaneous ignition before the fuel enters the main combustion zone.

关 键 词：煤直接液化 航空煤油 着火延迟期 正戊基环己烷 化学反应动力学 

分 类 号：V312[航空宇航科学与技术—航空宇航推进理论与工程] TK48[动力工程及工程热物理—动力机械及工程]