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<p>The ignition of ultralean (φ = 0.1) and lean (φ = 0.5) mixtures of hydrogen with air in the temperature range of 895–1597 K and a pressure behind the reflected shock wave of 1 and 5 atm was studied experimentally. Numerical modeling of the concentration profiles of the electron-excited OH<sup>*</sup> radical was performed using several available and widely used detailed kinetic mechanisms (FFCM-2, AramcoMech 3.0, Tereza et al., Keromnes et al., and Konnov 2019). Good agreement (both quantitative and qualitative) between the experimentally observed and calculated ignition delay values τ was demonstrated. A sensitivity analysis was performed, and the key chemical reactions influencing the formation of τ were identified, and it was found out how the nature and degree of influence of these reactions change with increasing temperature and pressure.</p>

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Experimental and Numerical Studies of the Ignition of Ultralean and Lean Mixtures of Hydrogen with Air at Normal and Elevated Pressure

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • P. N. Krivosheyev,
  • Yu. S. Kisel,
  • A. V. Skilond′,
  • A. M. Tereza

摘要

The ignition of ultralean (φ = 0.1) and lean (φ = 0.5) mixtures of hydrogen with air in the temperature range of 895–1597 K and a pressure behind the reflected shock wave of 1 and 5 atm was studied experimentally. Numerical modeling of the concentration profiles of the electron-excited OH* radical was performed using several available and widely used detailed kinetic mechanisms (FFCM-2, AramcoMech 3.0, Tereza et al., Keromnes et al., and Konnov 2019). Good agreement (both quantitative and qualitative) between the experimentally observed and calculated ignition delay values τ was demonstrated. A sensitivity analysis was performed, and the key chemical reactions influencing the formation of τ were identified, and it was found out how the nature and degree of influence of these reactions change with increasing temperature and pressure.