The Role of Third-Body Collision Efficiency in Autoignition of Hydrogen–Air Mixtures

Numerical simulations of autoignition of lean (6% H 2 ), stoichiometric, and rich (90% H 2 ) hydrogen–air mixtures have been performed to examine the influence of third-body efficiency (chaperon efficiency, CE) on the value of ignition delay, τ. The temperature ranges explored in the computations ar...

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Published in:Russian journal of physical chemistry. B 2024-08, Vol.18 (4), p.965-972
Main Authors: Tereza, A. M., Agafonov, G. L., Anderzhanov, E. K., Betev, A. S., Medvedev, S. P., Mikhalkin, V. N., Khomik, S. V., Cherepanova, T. T.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Combustion
Efficiency
Explosion
Hydrogen peroxide
Ignition
Mixtures
Physical Chemistry
Sensitivity
Shock Waves
Spontaneous combustion
Stoichiometry
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Summary:Numerical simulations of autoignition of lean (6% H 2 ), stoichiometric, and rich (90% H 2 ) hydrogen–air mixtures have been performed to examine the influence of third-body efficiency (chaperon efficiency, CE) on the value of ignition delay, τ. The temperature ranges explored in the computations are 850–1000 K for P 0 = 1 bar and 1000–1200 K for P 0 = 6 bar. By using a detailed kinetic mechanism, it has been found that the sensitivity of ignition delay to CE is the highest for the reaction step H + O 2 + M = HO 2 + M, which can lead to a variation in τ by a factor of 2 to 3. A pressure increase or deviation from stoichiometry reduces the sensitivity. The influence of CE is qualitatively different and weaker for the reaction step OH + OH + M = H 2 O 2 + M.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793124700416