The study of the combustion of a gas-air mixture using burners opens possibilities for further research, in which it is possible to modify the parameters of existing burners (geometry, method combustion air distribution, ...). Flame length can be influenced by changing some of the burner parameters to achieve the best possible conditions in the combustion chamber. The topic of the article is to study the effect of changing burner parameters on the length and nature of the flame in the combustion chamber. For this, an existing burner simulation model was modified. The properties of the proposed changes were investigated using the ANSYS simulation software. Simulation confirmed the suitability of the proposed system for reducing the flame length and intensifying the mixing of gaseous media. Also, the results show that the effect of changing the angle of combustion air supply along the longitudinal axis of the burner significantly affects the mixing of the fuel and, consequently, the nature of the flame with the combustion products.