Work

The role of third-body collision efficiency in autoignition of hydrogen–air mixtures

Year: 2024

Type: article

Abstract: Numerical simulations of autoignition of lean (6% H2), stoichiometric, and rich (90% H2) 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 P0 = 1 bar and 1000–1200 K for P0 = 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 + O2 + M = HO2 + 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 = H2O2 + M.

Source: Химическая физика

DOI: 10.31857/s0207401x24070071

Authors: A. M. Tereza, G. L. Agafonov, E. K. Anderzhanov, A. S. Betev, S. P. Medvedev, V. N. Mikhalkin, S. V. Khomik, T. T. Cherepanova

Institutions: Russian Academy of Sciences, Semenov Institute of Chemical Physics, Academy of the State Fire Service EMERCOM of Russia

Language: English

Topic: Advanced Combustion Engine Technologies

Subfield: Fluid Flow and Transfer Processes

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: bronze

OpenAlex ID: W4405841596

FWCI:

Cites: 25

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Related to: 10