2019 年 62 巻 199 号 p. 64-73
In this study, ignition delay times (IDTs) of C9H20 (Nonane) isomers were investigated with a newly developed shock tube facility and numerical simulation with KUCRS. It was found that ignition delay time (IDT) of 2,2,4,4-tetramethylpentane (2244mC5) is considerably longer than n-nonane (n-C9) especially in the negative temperature coefficient (NTC) region. The maximum difference is about one order of magnitude at 1000/T = 1.3 for 1.0 MPa and Φ = 1.0, where IDT of n-C9 is 3.6 ms while 29.9 ms for 2244mC5. Despite the significant difference in IDT, 0-D simulation with the reaction model generated by KUCRS could successfully reproduce the experimental results. According to the reaction path analysis and sensitivity analysis, it was considered that 2244mC5 tends to form cyclic ether due to its highly branched structure, which inhibits the increase of OH, and thus, chain branching reactions.