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<p>The ignition of lean mixtures of hydrogen with air and water vapor behind reflected shock waves was studied experimentally in the temperature range 947–1552 K at a pressure of 1 atm. Numerical simulation of the concentration profiles of the electron-excited OH<sup>*</sup> radical using several widely employed detailed kinetic mechanisms is performed. It is shown that the influence of water on the self-ignition of lean hydrogen–air mixtures at temperatures above 1050 K is insignificant. The discrepancy between the results of calculations and experimental data at temperatures below 1050 K is explained by the presence of small impurities formed in catalytic reactions on the surface.</p>

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Ignition of Hydrogen–Air–Water Vapor Lean Mixtures Behind Shock Waves

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • P. N. Krivosheyev,
  • Yu. S. Kisel,
  • A. V. Skilond’,
  • K. P. Avsyukevich,
  • A. M. Tereza,
  • O. G. Penyazkov

摘要

The ignition of lean mixtures of hydrogen with air and water vapor behind reflected shock waves was studied experimentally in the temperature range 947–1552 K at a pressure of 1 atm. Numerical simulation of the concentration profiles of the electron-excited OH* radical using several widely employed detailed kinetic mechanisms is performed. It is shown that the influence of water on the self-ignition of lean hydrogen–air mixtures at temperatures above 1050 K is insignificant. The discrepancy between the results of calculations and experimental data at temperatures below 1050 K is explained by the presence of small impurities formed in catalytic reactions on the surface.