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Experimental study of ignition behaviors of pyrolysis gas of kerosene‐based endothermic hydrocarbon fuel
Author(s) -
Zheng Dong,
Xiong Pengfei,
Zhong Beijing
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6856
Subject(s) - endothermic process , ignition system , kerosene , pyrolysis , hydrocarbon , mole fraction , reactivity (psychology) , thermodynamics , autoignition temperature , chemistry , analytical chemistry (journal) , sensitivity (control systems) , temperature coefficient , kinetic energy , materials science , organic chemistry , composite material , medicine , physics , alternative medicine , adsorption , pathology , quantum mechanics , electronic engineering , engineering
Summary The pyrolysis gas consisting of 29.4% CH 4 , 21.3% C 2 H 4 , 30.8% C 2 H 6 , and 18.5% C 3 H 6 in mole fraction is presented, as the surrogate of the actual gaseous pyrolysis products. At the conditions of T C = 877.7‐963 K, P C = 3.22‐4.37 MPa, φ = 0.5 and 1.0, the ignition delays of pyrolysis gas/air (diluted with 52% Ar) have been measured. With T C or P C increasing, the ignition delay time decreases. The auto‐ignition of φ = 1.0 is faster than that of φ = 0.5. Furthermore, two widely used small hydrocarbons chemical mechanisms are validated with the measured results. The USC‐II mechanism can well predict experimental results at high‐T regimes, but fails at low‐T regimes. By sensitivity analysis of temperature, the two elementary reactions C 2 H 6 + OH = C 2 H 5 + H 2 O (negative sensitivity coefficient) and C 3 H 6 + OH = aC 3 H 5 + H 2 O (positive sensitivity coefficient) have been identified, which have higher reactivity at low‐T and lower reactivity at high‐T. Considering the extreme uncertainty of rate constants of C 3 H 6 + OH = aC 3 H 5 + H 2 O, the kinetic parameters have been modified for improving the predictions. The validated results indicate that the optimized mechanism improves predictions of the auto‐ignition behavior at low temperature regimes.