ABSTRACT
In this chapter, combustion of gaseous jets will be discussed. For example, the following questions will be addressed: When natural gas is fired in a boiler, how long is the flame (turbulent jet)? When fuel is turned on in a gas stove, how tall is the flame (laminar jet)? What is the flame structure? As opposed to the combustion of solids and liquids, discussed in Chapter 9 to Chapter 11, the burning rate of a gas is known
a priori
because the gas generally flows at a specified rate through burners. The combustion of fuel and airflow within concentric tubes (Burke-Schumann [BS] flame) will be treated first as a diffusionlimited phenomenon and later extended to coflowing air. This will be followed by a discussion on jet combustion in stagnant air for any given Sc and coflowing air. The laminar jet combustion (Re < 2000) will be treated in detail, followed by turbulent combustion using a semiempirical approach.
