Akademik Veri Yönetim Sistemi
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS, cilt.48, sa.1, 2026 (SCI-Expanded, Scopus)
In this study, the effects of the diluents (N2, CO2, He, and Ar) on a hydrogen/methane flame under colorless distributed combustion conditions were investigated, with a focus on temperature and pollutant emission profiles. The temperature change percentage in the combustor was 51.41% under CO2 dilution, showing that CO2 was the most effective diluent for achieving the most uniform thermal field. CO2 was followed by N2, Ar, and He, with temperature changes of 68.43%, 70.21%, and 83.33%, respectively. More than 87% reductions in NOx emissions were achieved under all the diluent conditions. Based on the consistency between the temperatures and NOx emissions, CO2 dilution provided the highest NOx reduction of 99.88%, followed by N2 (93.12%) and Ar (90.92%), while He exhibited the weakest reduction at 87.31%. For CO emissions, N2 showed the greatest reduction (70.01%), followed by Ar (67.69%) and He (57.02%). In contrast, CO2 reduced CO emissions by only 14.17% at 22% O2 and caused CO emissions to increase up to twice the conventional level at 15% O2 because of inhibited CO oxidation resulting from the strong thermal suppression effect. Similarly, CO2 dilution led to elevated CO2 emissions, reaching a 358.51% increase at 15% O2. The lowest CO2 emissions were attained under the N2 dilution case, followed by the Ar and He dilution cases. Finally, when the thermal-field uniformity and the simultaneous reduction in all pollutants were evaluated comprehensively under the distributed combustion regime, N2 emerged as the most suitable diluent, while Ar appeared to be the next best alternative.