In the context of carbon neutrality,ammonia-hydrogen hybrid carbon-free fuel has received significant attention.However,the processes of ammonia synthesis and ammonia decomposition for hydrogen production also pose risks of ammonia-hydrogen combustion explosion.Currently,research on the detailed mechanism of ammonia-hydrogen combustion explosion is not sufficient,and traditional detailed mechanisms are very complex,resulting in lengthy computational times.To study the combustion and explosion characteristics of ammonia-hydrogen mixed gas under high pressure,a zero-dimensional homogeneous model(a simplified model that does not consider spatial distribution and assumes uniform physical and chemical properties)was used.The Directed Relation Graph with Error Propagation(DRGEP)method was applied to simplify the existing detailed mechanism of ammonia-hydrogen combustion explosion.Through sensitivity analysis,a simplified mechanism with fewer elementary reactions for ammonia-hydrogen combustion explosion was obtained.This simplified mechanism was then coupled with a Computational Fluid Dynamics(CFD)model to conduct numerical simulations of ammonia-hydrogen combustion in pipelines.The results show that the simplified mechanism performs well in validating laminar flame speed and ignition delay time.At explosion pressures of 59.61 atm and 69.97 atm,the average shock wave speed's relative error was below 1.4%,indicating high accuracy;and the CFD model coupled with the simplified mechanism could save a significant amount of computational resources.This research contributes to the development of ammonia-hydrogen combustion CFD simulation technology and can provide theoretical guidance for the combustion process and explosion prevention and control of ammonia-hydrogen blended carbon-free fuel.
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