Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.212, 2026 (SCI-Expanded, Scopus)
In this study, Colorless Distributed Combustion (CDC) method was applied to a hydrogen-assisted ammonia/air mixture to achieve an optimized thermal field with the lowest possible NOx emissions. In this context, the changes in the flame structures, temperature distributions and NOx emission characteristics of the mixture were experimentally and numerically investigated under the CDC regime, and the findings were compared with those of conventional combustion conditions. In the model validation study, the performance of five different reaction mechanisms was evaluated, and the Klippenstein mechanism, integrated with the Standard k-ε turbulence model, was found to be the most accurate in predicting the thermal field and NOx emission characteristics. The flame blow-out was observed at the 14 % O2 concentration in the experiments. At the lowest achievable O2 concentration (15 %), NOx emissions were reduced by 97.05 % in comparison to the conventional combustion. However, the NH3 slip reached 2025.26 ppm at 15 % O2 concentration. The optimal operating conditions were obtained at 17 % O2, yielding an 88.32 % NOx reduction with negligible NH3 slip. This significant NOx reduction was achieved as the CDC technology played an essential role in mitigating the effects of the fuel-NO mechanism, which is the primary source of high NOx emissions of the mixture. In addition, the flame luminosity and temperature decreased, thus, a more uniform temperature fields in the combustor were obtained. Consequently, the results in the present study reveal that CDC technology can be a promising alternative method for the dissemination of the NH3-containing fuels for clean energy conversion in practical combustion systems with minimum modifications.