稀薄燃烧对汽油/氨和乙醇/氨发动机燃烧及排放的影响

In this paper, the combustion and nitrogen-based emission characteristics of gasoline/ammonia and ethanol/ammonia were investigated in a four-cylinder, four-stroke spark ignition engine. The results showed that: Gasoline/ammonia is more advantageous than ethanol in terms of engine dynamics and economy; the nitrogen-based emission patterns are similar when the engine is fueled with gasoline/ammonia and ethanol/ammonia. Ammonia blending significantly increase the NOx emission. Affected by positive temperature correlation and negative pressure correlation of fuel- NOx, it decreases with the spark timing advance at λ = 1.0. The control authority of temperature of fuel-NOx is enhanced in the lean-burn conditions, so it increases with the spark timing advance at λ = 1.2 and 1.4. The NH3 emission is controlled by the crevice mechanism and volumetric quenching effect, and volumetric quenching effect is enhanced with λ increases. The N2O emission is controlled by the low-temperature oxidation path of ammonia and increases with the delay of spark timing and increase of λ. After ammonia blended, the NOx conversion efficiency of the TWC decreases, while the CO conversion efficiency increases at the stoichiometric ratio, and the high-efficiency zone of TWC is shifted to rich-burn with a small amount.