Gas Flame Structure and Optical Assessment of the Flame Speed and Combustion Efficiency

Abstract

We perform the analysis of a prepared propane-butane flame structure, by using the computer processing of the radiation from the chemical reaction zone. We mark out the stoichiometric reaction along with the zones of the external oxidant inflow into the flame for different burner diameters. We suggest a method of determining the normal flame speed based on catching the moment of the complete fuel combustion in the upper part of a flame. We show a role of the external oxidant inflow in the kinetic processes within the burning zone. The absolute value of the normal component of the flame speed and its dependence on the burner diameter and on the excess oxidant ratio for a prepared propane-butane flame are determined experimentally.

The structure of a gas flame and the mechanism of the flame front formation

“…According to known data, 1 it is important to draw one's attention to the necessity of taking into account the effect of secondary (atmospheric) air on the formation of the flame front during combustion of a prepared mixture in a burner. Researchers have found experimentally 5 the values of normal flame speeds for the flames above nozzles of various diameters. Further, 6 the concept of the local speed of normal burning was introduced, and its values were experimentally determined, yielding the distributions along the flame front.…”