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The combustion of the open flame of an air-domestic gas mixture in air is considered. The con cept of the stoichiometric ratio for such a system is specified. The combustion of an enriched mixture, a sto ichiometric mixture, and a depleted mixture are singled out. For each case, the structure of the flame and its variations under the condition of the transition of the combustion into the pulsating mode are found by elec tric and optic measurements. A significant role of the secondary (ambient, atmospheric) air for the stoichio metric flame combustion is noted.

An open household gas flame burning in the air atmosphere is studied. A concept of the stoichiometric ratio is clarified for such system on the basis of the observable closed inner cone formation and the pulsating combustion mode onset. We point out the higher combustion efficiency after the transition to a diluted mixture and the pulsating combustion. We also note that several different parameters may act as the limiting factors under certain oxidant-fuel ratios. K e y w o r d s: pulsating combustion mode, stoichiometric ratio, gas flame.

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