Akademik Veri Yönetim Sistemi
FUEL, cilt.381, 2025 (SCI-Expanded, Scopus)
This study examines the effects of hydrogen addition to propane in a lean premixed burner. Four hydrogen mole fractions (15 %, 25 %, 35 %, and 45 %) are analyzed to assess their impact on flashback, combustion performance, and instability. Large eddy simulation (LES) with flamelet-generated manifold (FGM) models are used to evaluate combustion regimes in a fully three-dimensional computational domain. Combustion regime maps are created for various operating conditions, based on equivalence ratio and air mass flow rate. Increasing hydrogen mole fractions leads to flashback at lower air mass flow rates and higher equivalence ratios. However, hydrogen also improves heat output by 9.6-17.7 % and reduces carbon monoxide emissions per unit heat output by 22.6-40.4 %, depending on the conditions. Flashback can be effectively prevented across a wide range of conditions by modifying the mixing tube to a conical shape. Combustion instability analysis shows that hydrogen addition does not cause instabilities, except in the conical mixing tube at higher equivalence ratios and lower air mass flow rates.