摘要
利用单脉冲激波管对碳氢燃料JP-10在1150～1300 K条件下的高温热裂解特性进行了实验研究,采用气相色谱法分析热裂解产物并获得了热裂解速率系数.主要裂解产物有乙烯、乙炔、丙烯、丁烯、1,3-丁二烯、环戊二烯、环戊烯、苯、甲苯,以及少量的甲烷、乙烷、二甲苯和甲基环戊烯.将每次激波管实验后所有产物浓度累加, JP-10裂解速率系数由实验测定.为了消除激波运行中非理想性和边界层效应导致反应温度确定的误差,采用对比速率法确定裂解温度,即在反应物中加入少量热解速率已知的内标物,根据内标物在相同的激波管实验条件下的裂解程度确定反应温度.根据内标物裂解量确定的激波管裂解反应温度通常小于采用传统测量激波速度由激波关系计算的反射激波后5区温度.在1200～1300 K之间两种方法得到的温度吻合得较好,差异在20K以内,随着温度升高,两者差异增大.在实验研究的基础上,依据San Diego Mechanism对JP-10高温裂解过程进行了动力学模拟.结果显示:主要裂解产物中乙烯、乙炔和1,3-丁二烯产量随温度变化的实验值与San Diego Mechanism的模拟结果有很好的一致性,但环戊烯产量的实验值比模拟值高很多,预示JP-10裂解中完全开环和部分开环反应都是重要的裂解通道.
Pyrolysis of JP-10 hydrocarbon fuel was studied in a single-pulse shock tube over temperature range from 1150 K to 1300 K.The main decomposition products were identified by gas chromatography as ethylene,acetylene,propylene,n-butene,1,3-butadiene,cyclopentadiene,cyclopentene,benzene,toluene,and a small amount of methane,ethane,xylene and 1-methylcyclopentene.By summation of all product concentrations in each run,the rate coeffcient of JP-10 pyrolysis was experimentally determined.Comparative rate measurements were used to eliminate the effects of shock’s non-ideality and boundary layer.A small amount of the internal standard compound,whose rate expression for decomposition is well established,was added in the test gas mixtures,and the reaction temperatures were determined according to the decomposition extents of the internal standard compound under the same experimental conditions in a shock tube.The reaction temperatures determined from the decomposition extents of the internal standard compound are usually less than those at the region 5 behind reflected shock calculated by shock velocity measurements.The temperatures determined by two methods are consistent between 1150 K and 1300 K,the difference is within 20 K,and the difference increases with the temperature increase.Based on the experimental study,kinetic modeling of JP-10 pyrolysis was carried out according to San Diego Mechanism.The yields of three main products,ethylene,acetylene and 1,3-butadiene,have a good agreement between the experimental and the simulation results,while the experimental results of cyclopentene yield are much higher than simulation,indicating that both fully and partially ring-opening reactions in JP-10 pyrolysis are important decomposition reaction pathways.
作者
熊壮
王苏
张灿
俞鸿儒
Xiong Zhuang;Wang Su;Zhang Can;Yu Hongru(State Key Laboratory of High-Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China)
出处
《力学学报》
EI
CSCD
北大核心
2019年第1期85-93,共9页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(90916017)
关键词
裂解
碳氢燃料
对比速率法
激波管
pyrolysis
bydrocarbon fuel
comparative rate measurement
shock tube
