Abstract
Results of numerical analysis of methane and gasoline combustion in multipoint ignition SI engine are presented in the paper. Work parameters of engine fuelled with methane lean mixtures of λ = 1.45 and 1.8 for three configurations of spark plugs (one, two and four active spark plugs) are compared. These configurations were chosen taking into consideration earlier research concerning numerical modelling and experiments. The results of carried out analysis proved that using two spark plugs at air excess number λ = 1.8 caused that engine work parameters are similar to case of mixtures of λ = 1.45 with one spark plug configuration. Simultaneously, the emission of nitric oxide was decreased more than eight times and the concentration of carbon dioxide in exhaust gases was 20% lower.
Highlights
Introducing more rigorous toxic components emission standards forces the piston engine design development
The numerical modelling was performed in KIVA-3V code [2]
The simulation of combustion process was performed for gaseous fuel at two air excess factor values (l = 1.45 and 1.8) and three active spark plugs configurations as follows: 2, 1-2, 1-2-3-4
Summary
Introducing more rigorous toxic components emission standards forces the piston engine design development. Lean mixture combustion can lead to efficient decrease in toxic component emission and increase in engine efficiency It is connected with problems such as decrease in flame propagation velocity or high level of engine work nonrepeatability. The paper aims at analysis of application of the multipoint ignition in stationary gaseous engines operating at constant rotational speed and driving electric generators Such engines can be fuelled with natural gas, biogas (waste dump gas, sewage gas) or mine gas as well as fuels containing methane. Skuteczne obniżenie emisji powyższych składników spalin oraz zwiększenie sprawności silników ZI można uzyskać przez spalanie mieszanek zubożonych. Lean mixtures of gasoline [10] This time the scope of the research is the application of multipoint ignition in engine fuelled with lean mixtures of methane and air and the impact of such approach on the emission of NO and CO2
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