Ignition characteristics of nitromethane-doped ethanol in a heated shock tube

Shang，Yan lei1; Li，Chong1; He，Li2; Zhang，Zhen peng1; Ning，Hong bo1; Zhang，Run tong3; Luo，S. N.1; Shi，Jin chun4

2021-09-01

10.1016/j.enmf.2021.06.001

Energetic Materials Frontiers   影响因子和分区

2666-6472

Ignition delay times of nitromethane-doped ethanol dual fuels are measured under the micro-combustion engine conditions (8 ​× ​10 ​Pa and 904–1477 ​K). The promotion effect of nitromethane on ethanol ignition is more pronounced at a fuel-lean condition; it first increases and then decreases with increasing blending ratio and temperature. The optimal promotion effect is achieved at 950–1150 ​K with an addition of ~50% nitromethane (mole fraction). A chemical kinetic model is proposed to describe the ignition process of nitromethane-doped ethanol, and can reproduce the measured ignition delay times. Reaction pathway, sensitivity, and rate of production analyses are performed to reveal the promotion mechanisms of nitromethane. The consumption of ethanol via the H-abstraction reactions is enhanced due to the pyrolysis of nitromethane, and the produced ethanol radicals are beneficial to the re-establishment of the radical pool after the first-stage ignition of nitromethane. With decreasing temperature, nitromethane decomposes slowly, while the low-temperature oxidation of ethanol becomes more important. At a moderate temperature, both these two reasons result in a shorter ignition delay time.

Chemical kinetics Ethanol Ignition delay time Nitromethane Shock tube

英语

其他

National Natural Science Foundation of China[11627901];National Natural Science Foundation of China[21903064];

2-s2.0-85126165621

Scopus

1.Key Laboratory of Advanced Technologies of Materials,Southwest Jiaotong University,Chengdu,Sichuan,China
2.School of Physical Science and Technology,Southwest Jiaotong University,Chengdu,Sichuan,China
3.Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong,China
4.The Peac Institute of Multiscale Sciences,Chengdu,Sichuan,China

Shang，Yan lei,Li，Chong,He，Li,et al. Ignition characteristics of nitromethane-doped ethanol in a heated shock tube[J]. Energetic Materials Frontiers,2021,2(3):174-180.

Shang，Yan lei.,Li，Chong.,He，Li.,Zhang，Zhen peng.,Ning，Hong bo.,...&Shi，Jin chun.(2021).Ignition characteristics of nitromethane-doped ethanol in a heated shock tube.Energetic Materials Frontiers,2(3),174-180.

Shang，Yan lei,et al."Ignition characteristics of nitromethane-doped ethanol in a heated shock tube".Energetic Materials Frontiers 2.3(2021):174-180.