Numerical modelling of combustion in SI engine fuelled with methane

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.

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Numerical analysis of spark plugs number influence on selected parameters of combustion in piston engine

Combustion Engines ◽

10.19206/ce-117286 ◽

2008 ◽

Vol 132 (1) ◽

pp. 50-55

Author(s):

Arkadiusz KOCISZEWSKI

Keyword(s):

Numerical Analysis ◽

Numerical Modelling ◽

Computational Analysis ◽

Combustion Process ◽

Graphical Form ◽

Si Engine ◽

Spark Plug ◽

Crank Angle ◽

3D Numerical Modelling ◽

Lean Mixtures

The results of numerical analysis of combustion in multi-spark plug SI engine are presented in the paper. The outcome of computational analysis of lean mixtures combustion in engine with one and two spark plugs are compared. The output data was presented in graphical form as screenshots (temperature distribution) and as pressure and temperature courses in function of crank angle. 3D numerical modelling of combustion in multi-spark plug engine proved that improvement in lean mixture combustion process can be obtained by increasing the number of active ignition points. As conclusion it can be stated that numerical modelling results confirmed the favourable influence of applying two active spark plugs in lean mixtures combustion.

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Effect of Operating Conditions on Pollutants Concentration Emitted from a Spark Ignition Engine Fueled with Gasoline Bioethanol Blends

Journal of Renewable Energy ◽

10.1155/2015/170896 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Haroun A. K. Shahad ◽

Saad K. Wabdan

Keyword(s):

Nitric Oxide ◽

Carbon Dioxide ◽

Experimental Investigation ◽

Spark Ignition ◽

Operating Conditions ◽

Spark Ignition Engine ◽

Variable Speed ◽

Exhaust Gases ◽

Speed Increase ◽

Energy Replacement

This study is an experimental investigation of the effect of bioethanol gasoline blending on exhaust emissions in terms of carbon dioxide CO2, carbon monoxide CO, unburnt hydrocarbons UHC, and nitric oxide NOxof a spark ignition engine. Tests are conducted at controlled throttle and variable speed condition over the range of 1200 to 2000 rpm with intervals 400 rpm. Different compression ratios are tested for each speed, namely (7,8,10, and 11). Pure gasoline and bioethanol gasoline blends are used. The bioethanol used is produced from Iraqi date crop (Zehdi). Blending is done on energy replacement bases. Ethanol energy ratio (EER) used is 5%, 10%, and 15%. At each of the three designated engine speeds, the torque is set as 0, 3, 7, 10, and 14 N·m. It is found that ethanol blending reduces CO and UHC concentration in the exhaust gases by about 45% and 40.15%, respectively, and increases NOxand CO2concentrations in the exhaust gases by about 16.18% and 7.5%, respectively. It is found also that load and speed increase causes an increase in CO2and NOxconcentrations and reduces CO and UHC concentrations. It is also found that increasing the compression ratio causes the emissions of CO2and NOxto decrease and those of CO and UHC to increase.

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