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of ENGINEERING-HUNEDOARA, ROMANIA NUMERICAL AND EXPERIMENTAL STUDY OF EXTENDED EXPANSION CONCEPT APPLIED TO LEAN BURN SPARK IGNITION ENGINE

A Manivannan
unpublished

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This paper deals with numerical and experimental study of 4-stoke, Single cylinder, Spark Ignition, Extended Expansion Lean Burn Engine. Engine processes are simulated using thermodynamic and global modeling techniques. Two-zone combustion model is used for analysis of combustion process. In the simulation study the following process are considered compression, combustion, and expansion. Sub-models are used to include effect due to gas exchange process, heat transfer and friction. Also emission
more » ... characteristics like unburned hydrocarbon and nitric oxide are predicted. In the present work extended expansion concept is applied to a four-stroke lean burn engine to further improve performance and emission characteristics. The result presented compares the performance and emission characteristic of extended expansion lean burn engine with ER/CR ratio 1.5 with base lean burn engine. Compared to base lean burn engine extended expansion lean burn engine shows better performance and emission characteristics i.e. 17.95 % improvement in the thermal efficiency, 16.63 % improvement in fuel consumption, 48.27 % reduction NO X emission and 48.4 % reduction UBHC emission for engine with a CR of 8.5.
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Citation

A Manivannan. "of ENGINEERING-HUNEDOARA, ROMANIA NUMERICAL AND EXPERIMENTAL STUDY OF EXTENDED EXPANSION CONCEPT APPLIED TO LEAN BURN SPARK IGNITION ENGINE."