Combustion Properties of Jet A/Ethanol Blends in a Porous Media Burner

摘要

Porous media combustion has several advantages including increased heat transfer from product gases to reactants, improved combustion efficiency and reduced pollutant emissions. Ethanol is a renewable biofuel which can be blended with petroleum-based fuels. In this study, the combustion properties of a 10% (by volume) ethanol blend with Jet A in a porous-media burner are compared with those of pure Jet-A. Five injector-exit equivalence ratios were studied: 0.2, 0.41, 0.67, 0.8 and 0.96. The global NOx emissions, concentrations of CO_2 and O_2 in exhaust, global temperature of exhaust, and radial temperature profiles at 50% flame height were measured. The flame heights of the ethanol-blend flames were smaller than those of Jet A by 10 -20%. The NOx emission index and the global temperature of the ethanol-blend flames were higher than those of the Jet-A flame. At an equivalence ratio of 0.4, the temperatures at mid-flame of the ethanol-blend flame were lower than those of Jet-A; the differences in temperature were negligible at an equivalence ratio of 0.8.