Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.47, sa.24, ss.12338-12353, 2022 (SCI-Expanded)
This study aims at investigating the combustion characteristics of methane and a hydrogen-rich fuel on distributed regime in a combustor with high internal recirculation as distributed regime can achieve with highly internal entrainment. The model validation was first taken place with the existing experimental results under non-reacting conditions, and it is demonstrated that the mean velocity profiles predicted are in satisfactorily good agreement with the existing data in the combustor. Then, the methane and the hydrogen-rich fuel were consumed at an equivalence ratio of 0.8 and a thermal power of 10 kW under distributed conditions which means that oxygen concentration in the oxidizer is reduced from 21% to 15% along with internal entrainment for each fuel used. The results showed that the velocity magnitudes increased in the combustor with decrease in oxygen con-centration because of diluent introduction. Moreover, distributed regime enabled uni-formly temperature field inside the combustor together with the ultra-low NOX values with introducing the diluent. In addition, one can say that the maximum temperature and the outlet NOX values (1800 K and 27.60 ppm at 21% O-2-1450 K and 0.05 ppm at 15% O-2 for methane, 2000 K and 32.47 ppm at 21% O-2 -1700 K and 0.19 ppm at 15% O-2 for the hydrogen-rich fuel) were relatively higher while combusting the hydrogen-rich fuel compared to those of methane due to the presence of hydrogen. However, It is concluded that distributed regime provided uniformly temperature fields and ultra-low NOX levels even the hydrogen-rich fuel is used. (C)& nbsp;2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.