| Abstract: | To alleviate global warming, ammonia is being considered as a zero-carbon fuel for automotive engines to reduce carbon emissions. However, due to the disadvantages of ammonia, such as high auto-ignition temperature, high minimum ignition energy and low laminar flame speed, it is necessary to use hydrogen as a promoter to improve the combustion performance of the ammonia-fueled engine. The paper provides a comprehensive review of relevant literature, summarizing the research advancements in combustion control methods for ammonia/hydrogen dual-fuel engines. It also analyzes the state of research on the coupling between catalytic decomposition of ammonia for hydrogen production and ammonia engines.It is found that the on-board decomposition of ammonia to produce hydrogen can avoid the use of dual fuel supply systems. The results show that the use of hydrogen as a combustion promoter increases the combustion rate of ammonia engines while reducing the emissions of nitrogen oxides. However, issues such as power performance deterioration and unburned ammonia emissions still exist in ammonia engines. These challenges call for further investigation and resolution in future studies. |
