Abstract: We consider combustion regimes with hydrogen/air mixtures of stoichiometric (29.5% of hydrogen by volume) and sub-stoichiometric (less than 29.5%) compositions in the combustion chamber with parameters presented in the electronic supplementary materials. Pressure histories obtained numerically for combustion regimes of hydrogen/air mixtures of different compositions (29.5%, 26.0%, 24.0%, 22.0%, 20.0%, and 18.0%) are presented in Fig. 1a. Analysis of the data enables three characteristic combustion regimes to be distinguished: (1) detonation, observed for the stoichiometric mixture and originating spontaneously as a result of ignition of the compressed mixture, (2) a fast combustion regime, distinctively observed in the 26.0% (as well as in the 24.0% and 22.0%) mixture where the pressure history is characterized by pressure oscillations of relatively high amplitude and frequency, and (3) a slow combustion regime, realized for 18.0% hydrogen content in the mixture, where the pressure history is characterized by pressure oscillations of relatively low amplitude.

Key words: Hydrogen/air combustion; Reciprocating engine; Knock

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