Simulation and Analysis of Thermodynamic Characteristic Parameters of Internal Combustion Rankine Cycle Ammonia Hydrogen Blended Fuel Engine

Abstract:

To realize the application of NH₃/H₂ blended fuel in internal combustion engines， an internal combustion Rankine cycle model of NH₃ / H₂ blended fuel was established in this paper based on Cantera. Additionally， the numerical simulation of combustion process of internal combustion Rankine cycle NH₃ / H₂ blended fuel engine under the conditions of different ammonia hydrogen mixing ratios， excess air ratios， and water spray volumes was conducted. Finally， the influence of different boundary conditions on combustion characteristics was analyzed from the perspectives of thermodynamic cycle efficiency and typical pollutant emissions. The results show that the increase of excess air ratio and in cylinder water spray volume improve the thermodynamic cycle efficiency by 2.66% and 7.00% respectively， hence the effect of water spray is more significant. Besides， NO is the main NO_x pollutant emitted at the end of fuel combustion. Water spray in the cylinder is beneficial to the reduction of NO_x emissions. After the application of the water spray technology， the emission of NO and NO₂ in combustion products is reduced by 37%.

Key words:power machinery engineering;blended fuel;internal combustion Rankine cycle;thermal efficiency;emission characteristics