THERMAL SCIENCE

International Scientific Journal

Fazil Akgun

,

Samet Celebi

,

Usame Demir

,

Hasan Yamik

ANALYSIS OF PRE-INJECTION RATE EFFECTS ON COMBUSTION, PERFORMANCE, AND EMISSIONS IN A JP8-FUELED PPCI ENGINE

ABSTRACT
In this study, the effects of varying pre-injection rates (10%, 20%, 30%, 40%) on engine performance, combustion efficiency, and emissions were investigated in a partial premixed compression ignition (PPCI) engine using JP8 fuel at various loads (0%, 25%, 50%, 75%, and 100%) and compared with diesel fuel. A 10% pre-injection rate was most effective in maintaining fuel efficiency across loads, showing the lowest BSFC values. At 50% load, the 10% rate resulted in a brake specific fuel consumption of 294.22 g/kWh, only 9.69% higher than diesel. Higher rates (30% and 40%) increased fuel consumption and decreased efficiency. Combustion efficiency and CO2 emissions improved with 20% and 30% rates, especially at high loads. At 75% load, 30% pre-injection increased CO2 emissions to 8.827%, exceeding diesel 7.88%, indicating better combustion. Soot emissions decreased significantly with 30% and 40% rates, but NOx emissions rose substantially, with the 40% rate reaching 1448 ppm at full load. The 10% rate was deemed optimal for balancing efficiency and low emissions, while higher rates, though beneficial for combustion and soot, require measures to mitigate NOx emissions.
KEYWORDS
PPCI, JP8, pre-injection, engine performance, exhaust emissions, combustion
PAPER SUBMITTED: 2024-12-20
PAPER REVISED: 2025-02-15
PAPER ACCEPTED: 2025-04-04
PUBLISHED ONLINE: 2025-09-26
DOI REFERENCE: https://doi.org/10.2298/TSCI2504001A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 4, PAGES [3001 - 3011]
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Analysis of pre-injection rate effects on combustion, performance, and emissions in a JP8-fueled PPCI engine

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence