Technical Paper
Experimental Study on Ammonia-Methanol Combustion and Emission Characteristics in a Spark Ignition Engine
2024-04-09
2024-01-2820
Ammonia and methanol are both future fuels with carbon-neutral potential. Ammonia has a high octane number, a slow flame speed, and a narrow ignition limit, while methanol has a fast flame speed with complementary combustion characteristics but is more likely to lead pre-ignition and knock. In this paper, the combustion and emission characteristics of ammonia-methanol solution in a high compression ratio ignition engine are investigated. The experimental results show that, compared with pure methanol, the peak in-cylinder pressure and peak heat release rate are lower and the combustion phase is delayed when the engine is fueled with ammonia-methanol solution, while the thermal efficiency is slightly lower. Compared with pure methanol, NOx emissions are higher while GHG emissions are slightly lower when ammonia is 12% of the energy in solution.