Effect of Carbon Dioxide, Argon and Hydrocarbon Fuels on the Stability of Hydrogen Jet Flames-Paper

Experimental studies were carried out to examine the lift-off and blow-out stability of H2/CO2, H2/Ar,H2/C3H8 and H2/CH4 jet flames. The experiments were carried out using a burner with a 2mm inner diameter.The flame structures were recorded by direct filming and also by a schlieren apparatus. The experimentsshowed that the four gases affected the lift-off and blow-out stability of the hydrogen differently. Theexperiments showed that propane addition to an initially attached flame always produced lifted flame and theflame was blown out at higher jet velocity. The blow-out velocity decreased as the increasing in propaneconcentration. Direct blow-off of hydrogen/propane was never observed. Methane addition resulted in arelatively stable flame comparing with the carbon dioxide and propane addition. Comparisons of the stabilityof H2/C3H8, H2/CH4 and H2/CO2 flames showed that H2/C3H8 produced the highest lift-off height. Propane ismuch more effective in lift-off and blow out hydrogen flames. The study carried out a chemical kineticanalysis of H2/CO2, H2/Ar, H2/C3H8 and H2/CH4 flames for a comparison of effect of chemical kinetics onflame stability.