TY - JOUR
TI - Analysis of pre-injection rate effects on combustion, performance, and emissions in a JP8-fueled PPCI engine
AU - Akgun Fazil
AU - Celebi Samet
AU - Demir Usame
AU - Yamik Hasan
JN - Thermal Science
PY - 2025
VL - 29
IS - 4
SP - 3001
EP - 3011
PT - Article
AB - 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.