In-Cylinder Flow Characterization of a Hydrogen-Ammonia Fueled Rotary Engine 2023-01-7073

At present, the problem of global warming is becoming more and more serious, and the transformation of energy structure is very important. The rotary engine has the advantages of small size, high power-to-weight ratio, and high fuel adaptability, which makes it promising for application in the fields of new energy vehicle range extender and unmanned aerial vehicle. To this end, this paper proposes the idea of hydrogen/ammonia dual-fuel combination applied to rotary engine, using the experimentally verified three-dimensional simulation model of rotary engine, to study the process of hydrogen/ammonia rotary engine in-cylinder mixture formation under the direct-injection dilute combustion mode, and to analyze the impact of different dual-fuel injection strategies on the performance of rotary engine, and finds that delaying the moment of injection leads to the ammonia concentration in the middle and front of the combustion chamber; when the ammonia nozzle is located in the intake port, the effect of different ammonia injection moments on the hydrogen distribution is not significant, and the hydrogen distribution is basically the same, mainly in the middle and front part of the combustion chamber, and the ammonia is uniformly distributed in the combustion chamber; when the ammonia nozzle is located in the upper part of the cylinder block, with the delay of the ammonia injection moments, the distribution of hydrogen in the rear part of the combustion chamber is increased; when the ammonia nozzle is located in the lower part of the cylinder block, the effect of the ammonia injection on the distribution of hydrogen is not significant. In this paper, the in-cylinder flow process of hydrogen/ammonia fuel rotary engine is investigated, and the results can provide theoretical guidance and reference significance for the in-cylinder flow of hydrogen/ammonia fuel rotary engine.