THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Shivakumar Nagareddy

,

Kumaresan Govindasamy

COMBUSTION CHAMBER GEOMETRY AND FUEL SUPPLY SYSTEM VARIATIONS ON FUEL ECONOMY AND EXHAUST EMISSIONS OF GDI ENGINE WITH EGR

ABSTRACT
In this study, the combustion chamber geometry for spray-guided, wall-guided, and air-guided combustion strategies were fabricated. The piston crown shape and the cylinder head in each combustion chamber geometry was machined by fixing the fuel injector and spark plug at proper positions to obtain swirl, turbulence, and squish effects for better mixing of fuel with air and superior combustion of the mixture. Conducted tests on all the three modified gasoline direct injection engines with optimized exhaust gas recirculation and electronic control towards fuel injection timing, the fuel injection pressure, and the ignition timing for better the performance and emissions control. It is clear from the results that NOx emissions from all three combustion modes were reduced by 4.9% up to 50% of loads and it increase for higher loads due to increase of in-cylinder pressure. The fuel consumption and emissions showed better at 150 bar fuel injection pressure for wall-guided combustion chamber geometry. Reduced HC emissions by 3.7% and 4.7%, reduced CO emissions by 2% and 3.3%, reduced soot emissions by 6.12% and 10.6%. Reduces specific fuel consumption by about 10.3% and 13.3% in wall-guided combustion strategy compare with spray-guided and air-guided combustion modes respectively
KEYWORDS
gdi combustion, piston crown shape, combustion chamber modification, spark plug position, fuel injector position
PAPER SUBMITTED: 2021-10-20
PAPER REVISED: 2021-12-15
PAPER ACCEPTED: 2021-12-21
PUBLISHED ONLINE: 2022-01-02
DOI REFERENCE: https://doi.org/10.2298/TSCI211020358N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [1207 - 1217]
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Combustion chamber geometry and fuel supply system variations on fuel economy and exhaust emissions of GDI engine with EGR

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