An experimental and modeling study of n-hexadecane autoignition under low-to-intermediate temperatures

作     者：YU Liang WANG WenYu WANG SiXu FENG Yuan QIAN Yong LU XingCai YU Liang;WANG WenYu;WANG SiXu;FENG Yuan;QIAN Yong;LU XingCai

作者机构：Key Laboratory for Power Machinery and Engineering of M.O.E.Shanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2020年第63卷第5期

页      面：719-730页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51425602) 

主　　题：n-hexadecane autoignition rapid compression machine low-temperature reactivity ignition delay time kinetic model 

摘      要：N-hexadecane is a potential candidate of diesel surrogate fuels and is also the largest linear alkane(n-alkanes)with known chemical kinetic *** objective of this study is to investigate the autoignition characteristics of n-hexadecane in the lowto-intermediate temperature region and to validate the existing kinetic *** this study,the ignition delay times(IDTs)of nhexadecane were measured using a heated rapid compression machine(RCM)at two pressures of 7 and 10 bar,and over equivalence ratios ranging from 0.5 to ***-stage ignition characteristic and the negative temperature coefficient(NTC)behavior of total ignition delay time were experimentally *** study paid special attention to the influence of pressure,equivalence ratio,and oxygen content on the IDTs of *** is observed that both the total IDTs and the first-stage IDTs decrease with the rise of those *** is worth noting that the first-stage IDT is found to show a greater dependence on temperature but a weaker dependence on other parameters compared to the total *** observed IDT dependence in the lowtemperature region(LTR)were quantitatively described by ignition delay time *** newly measured IDTs were then validated against two kinetic models(LLNL and CRECK).Simulation results show that both models underpredict the first-stage IDT but generally capture the temperature *** CRECK model well predicts the total IDTs of n-hexadecane while the LLNL model significantly underpredicts the total IDTs at most investigated *** the best of our knowledge,this study is the first investigation on n-hexadecane autoignition under low-to-intermediate temperatures,which deepens the understanding of large n-alkane oxidation and contributes to the improvement of the existing kinetic models.