Recent developments in finding laminar burning velocity by heat flux method: A review

Abstract

This paper reviews the recent developments in heat flux method to determine the laminar burning velocity of a liquid or a gaseous fuel. Laminar burning velocity is an elementary property in designing the combustion chamber and turbulent combustion model and to validate kinetic simulation. There are numerous methods to find the laminar burning velocity such as Bunsen burner method, flat flame burner method, counterflow method, soap bubble technique, tube propagating technique, and heat flux method. In this paper, some of these methods are discussed in brief and recent developments of heat flux method have been elaborated, as this method is simple and accurate. To find out laminar adiabatic burning velocity, there are two requirements to be satisfied. First is the flame should be one-dimensional, thus flat and stretchless; second is adiabatic which means net heat exchange with the burner is zero. But, satisfying both these conditions at the same time is very difficult. The other methods have failed in satisfying both the conditions. However, heat flux method proved to satisfy these conditions. Results of laminar burning velocity using heat flux technique for methane–air have been compared with other methods of finding laminar burning velocity.