AN INVESTIGATION OF MULTl FUEL TURBULENT PREMIXED CONFINED FLAME STRUCTURE

Abstract

Due to the great development in combustion systems and the increasing efforts to reduce the levels of gaseous emission, the combustion systems must be operated with high efficiency and low level of gaseous emission. The combustion efficiency and gaseous emission depend on the combustion rate and the mixing velocity of air and fuel. Because of a large number of combustion systems use the commercial fuel, many investigations have been carried out to study the different factors affecting the combustion efficiency. However, most of these studies have been carried out under predominantly one dimensional flow and using simple pure hydrocarbon fuels. Consequently,; these studies do not simulate the conditions that exist in the practical combustors where flow and chemical kinetic effects are strongly coupled. In the present study effect of Reynolds number, equivalence ratio, fuel type and their blends on turbulent premixed confined flames structure have been investigated. The experimental set up consists of a flat grid burner where liqu,id fuel is sprayed into preheated combustion air, vaporizes and strongly mixes with air prior to introduction into the combustion space through perforated plate flame holder. The combustion gases are sampled at different locations within the flame using a water cooled, stainless steel isokinetic probe and the gases samples are analyzed using gas chromatograph and infrared analyzer. Flame temperatures and gas velocities have been measured.