TY - JOUR
TI - Exploring the combustion characteristics of turbulent premixed ammonia/hydrogen/air flames via DTF model-based large eddy simulation
AU - Wang Ping
AU - Zhang Zeyu
AU - Yang Zhengchun
AU - Roy Subhajit
AU - Qian Weijia
AU - Cheng Kang
JN - Thermal Science
PY - 2025
VL - 29
IS - 1
SP - 675
EP - 689
PT - Article
AB - This study aims to investigate the combustion characteristics of a premixed swirl flame for a fuel mixture made of NH3 and H2. The use of NH3 and H2 as carbon-free fuels in combustion systems can significantly reduce GHG emissions. Blending NH3 with H2 is a promising approach to enhance H2 combustion safety and NH3 combustion intensity. A 3-D large eddy simulation using a dynamically thickened flame (DTF) model was run in order to get extensive and multi-scale information regarding the flow and reacting field of a premixed swirl flame using a 50% NH3 50% H2 fuel blend. The findings indicate that whereas NO is created near the flame front, OH radicals are mostly synthesized in the inner re-circulation zone. The fuel-NO pathway, which is sensitive to flame temperature, is what causes NO to be produced. The flame position is where the re-circulation zone lies, and the total re-circulation strength is determined by the inner re-circulation strength. The prediction of NO concentration by large eddy simulations, considering heat loss, is closer to the experimental value. The chemically reacting network simulation can precisely estimate NO emission by considering the heat loss ratio and the re-circulation strength calculated by large eddy simulations. Overall, this study provides valuable insights into the combustion characteristics of an NH3/H2 fuel blend, which could contribute to the development of cleaner and more efficient combustion technologies. The findings of this study can be of great significance in the fields of sustainable energy and environmental protection.