Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.206, 2026 (SCI-Expanded, Scopus)
This study numerically investigates the effects of hydrogen addition to methane on flame parameters and methane reactivity under hot diluted oxidizer conditions. A non-premixed lab-scale tube burner forming a central fuel jet in the coflow oxidizer mixture was employed. The N2 dilution ratio ranged from 39 % to 88 % and the CO2 dilution ratio varied from 0 % to 40 % on molar basis in the oxidizer mixture for the pure methane combustion cases. The results show that the pure methane combustion stability is weakened if the O2 molar fraction in the oxidizer is 15 % or less. The hydrogen enrichment was studied by varying the hydrogen addition ratio from 10 % to 40 % on molar basis, while the methane consumption rate was kept constant. The obtained results reveal that the increasing hydrogen addition ratio improves the methane reactivity and stability by getting it consumed over a shorter axial distance. The hydrogen addition is proved to enhance the mixing rate of the reactants as a physical effect and increases the OH radical species concentration in the flame from the chemical effect aspect. This dual effect shifts the combustion flame upstream of the burner and makes it more stable. The further studies also reveal that the physical effects of hydrogen are more influential on the turbulent mixing in the flame.