THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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Performance investigation of CI engine using empirical correlation for burning duration

ABSTRACT
Fuel burning rate plays a major role in optimizing the performance of IC engine with reduced emission. In an attempt to optimize the performance of IC engine, a novel empirical correlation is developed for fuel burning duration in tune with the methodology proposed by an earlier investigator for SI engine. The correlation was integrated with the quasi-dimensional mathematical model to analyze the combustion, performance and emission characteristics of CI engine. Engine speed and fuel injection timing were varied to assess the performance and corresponding exhaust emission of CI engine. Predictions relating to variation of burning duration with compression ratio at different equivalence ratios are in reasonable agreement with the published data on burning duration. The simulated results show that the optimum injection timing lies in the range of 23º bTDC to 13º bTDC for brake power (BP) and indicated power (IP) both, and the lowest brake specific fuel consumption (BSFC) and indicated specific fuel consumption(ISFC) were found close to 13º bTDC. A sharp decrease in peak cylinder pressure was also observed with retarding injection timing, whereas both the retarding injection timing and increased engine speed accrue to reduced Nitric oxide (NO) exhaust at exhaust valve open (EVO).
KEYWORDS
PAPER SUBMITTED: 2018-01-25
PAPER REVISED: 2018-04-24
PAPER ACCEPTED: 2018-04-30
PUBLISHED ONLINE: 2018-05-13
DOI REFERENCE: https://doi.org/10.2298/TSCI180125149K
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