Performance and Sensitivity analysis of Factors Affecting NOx Emissions from Hydrogen Fueled SI Engines

Ali Eh. Sheet, Eiman

	Performance and Sensitivity analysis of Factors Affecting NOx Emissions from Hydrogen Fueled SI Engines
Journal of Petroleum Research & Studies
Article 1, Volume 120, Issue 12, 2016, Pages 47-74
Author
Eiman Ali Eh. Sheet
Abstract
An Analysis of Variance (ANOVA) sensitivity analysis using suitable MATLAB code on the factors affecting oxides of Nitrogen (NOx) emissions of a hydrogen powered 4-stroke, water-cooled spark-ignition engine was conducted in this work. This was done using specialized engine performance and emission simulation software. The parameters studied were the engine speed, air-fuel equivalence ratio, spark plug location in addition to some other combustion parameters like combustion duration, heat loss besides some other useful performance parameters. It was found that NOx formation is minimum at peripheral spark location, slightly lean (PHI=0.9), and less advance timing is needed. Further, based on ANOVA analysis, the combination of engine speed and spark location has more significance (effect based on P-value) compared with engine speed and equivalence ratio. The combination of engine speed and ignition timing has more significance (effect based on P-value) compared with engine speed and equivalence ratio. Also found that NOx emissions behavior is more clear at lean mixture (PHI = 0.7), central spark location (XSP = 0.5) and retarded ignition timing (IGN near zero).
Keywords
Hydrogen Fuel; ANOVA; Engine performance; Hydrogen combustion; Engine pollution

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