|Table of Contents|

Pyrolysis endothermic and oxidative exothermic mechanisms of JP-10 unraveled by ReaxFF molecular dynamics simulation(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2024年05期
Page:
53-64
Research Field:
目次
Publishing date:

Info

Title:
Pyrolysis endothermic and oxidative exothermic mechanisms of JP-10 unraveled by ReaxFF molecular dynamics simulation
Author(s):
LIU Han1; 2; XIAO Yuanyuan1; 2; ZHENG Mo1; 2; REN Chunxing1; LI Xiaoxia1; 2
1.State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China; 2.School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Keywords:
endothermic hydrocarbon fuel;  molecular dynamics simulation;  ReaxFF;  JP-10;  endothermic reaction mechanism;  oxidation reaction mechanism
PACS:
V312.1
DOI:
10.3969/j.issn.1672-9374.2024.05.005
Abstract:
Understanding the mechanisms of pyrolysis endothermic and oxidative exothermic reactions is vital in developing endothermic hydrocarbon fuel in reducing engine surface temperature of hypersonic vehicle. In this paper, the reaction mechanisms of endothermic and exothermic processes were revealed for the widely used endothermic fuel of JP-10 by ReaxFF molecular dynamics simulations(ReaxFF MD). The heat-up simulation results show that the transition point from endothermic to exothermic for the total reaction heat effect of JP-10 oxidation system is around 2 600 K. The absorbed heat of the ring-opening reactions in the endothermic stage accounts for about 64% of the total heat absorption. The stepwise reactions of H free radicals and O2 into HO2 and HO free radicals, and HO2 and HO into H2O will release a large amount of heat, accounting for about 54% of the total heat release in the oxidation stage. This work demonstrates that reaction energy analysis of ReaxFF MD simulations is potentially a new approach for identifying important reaction pathways and understanding the effects of fuel molecular structures on fuel endothermic capacity and fuel pyrolyzate composition on fuel oxidative exothermic capacity.

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