摘要
为了复现实际船用重油燃料燃烧特性,基于化学解构法原理,提出了重油多元模型燃料。选择了正十四烷、2,6,10三甲基十二烷、四氢化萘和正癸基苯作为基础燃料,表征实际重油的正构烷烃、异构烷烃、环烷烃和芳烃成分。模型燃料的比例依据带权欧几里得距离算法进行最优化求解。针对发展的多元模型燃料,基于流动反应器试验平台对模型燃料的中低温氧化特性进行点对点比较,多组分模型燃料成功复现了典型反应物、中间产物和生成物浓度随温度变化的趋势。基于“解耦法”的机理简化方法,发展了重油多组分模型燃料骨架机理。该机理成功预测了重油馏分的中低温氧化特性。基于该骨架机理进行敏感性分析,得到烷烃类自由基主导的基元反应与重油碳烟生成密切相关的结论。此外,基于定容燃烧装置数值仿真结果,证明了重油多组分模型燃料对近发动机条件下的喷雾燃烧过程具有较高的预测能力。
In order to reproduce combustion properties of heavy fuel oil,a multi-component surrogate was proposed based on the chemical deconstruction method.The multi-component surrogate consisted of n-tetradecane,farnesane,tetralin and n-decylbenzene to characterize n-alkanes,iso-alkanes,cyclo-alkanes and aromatics in the target fuel,respectively.Besides,the optimal proportions of surrogate components were determined by the weighted Euclidean distance algorithm.Point-to-point validations of oxidation properties of the multi-component surrogate at low and intermediate temperatures were experimentally conducted in a flow reactor.The multi-component surrogate successfully reproduced the changing profiles of the concentrations of typical reactants,intermediates and products with temperature.Based on the decoupling methodology,a skeletal mechanism for the multi-component surrogate was proposed and developed.The mechanism effectively predicted the oxidation property of heavy residual fuel oil at low and intermediate temperatures.According to the sensitivity analyses based on the skeletal mechanism,elementary reactions relates to large n-alkane contributed a lot to soot formation in the combustion of heavy fuel oil.Besides,according to the results in a visual constant volume combustion chamber,the multi-component surrogate well predictes the spray and combustion process in engine-relevant conditions.
作者
朱磊
李昂
张真英男
黄震
ZHU Lei;LI Ang;ZHANG Zhenyingnan;HUANG Zhen(Key Lab. for Power Machinery and Engineering of M. O. E. , Shanghai Jiao Tong University, Shanghai 200240, China)
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2020年第6期36-45,共10页
Chinese Internal Combustion Engine Engineering
基金
船用低速机工程(一期)研制(工信部联装函[2017]21号)
国家自然科学基金项目(52071216,91741120)。
关键词
船用重油
模型燃料
流动反应器
氧化特性
骨架机理
heavy fuel oil
surrogate fuel
flow reactor
oxidation property
skeletal mechanism
