International Conference


TitleYoungsoo Park and Choongsik Bae, "Application of JP-8 to Premixed Charge Ignition (PCI) Combustion in a Single-Cylinder Diesel Engine," Proc. Thermofluidynamic Processes in Diesel Engines (THIESEL), Valencia, Sep. 2014.

Youngsoo Park and Choongsik Bae, “Application of JP-8 to Premixed Charge Ignition (PCI) Combustion in a Single-Cylinder Diesel Engine,” Proc. Thermofluidynamic Processes in Diesel Engines (THIESEL), Valencia, Sep. 2014.

Abstract

An aviation fuel, jet propellant-8 (JP-8) has been used as the single fuel for military vehicles to simplify the logistic supply. The emission regulations on military vehicles are forcing the engines fuelled with JP-8 to become cleaner. In this study, JP-8 was applied to premixed charge ignition (PCI) combustion, which is beneficial for low nitrogen oxides (NOx) and particulate matter (PM) emissions, in a single-cylinder diesel engine under two operating conditions. The JP-8 performance was also compared with diesel fuel. The main injection timings of two fuels were varied from 24 to 30 crank angle
degree before top dead center (CAD bTDC) to prepare a premixed in-cylinder charge. Without exhaust gas recirculation (EGR), it was found that the ignition delay with JP-8 was 2~3 CAD longer than that with diesel fuel due to its lower cetane number although JP-8 has a better evaporation characteristics. This retarded combustion phase with JP-8 led to a higher indicated mean effective pressure (IMEP) compared with diesel fuel. The peak of heat release rate was lower with JP-8 because of locally leaner air-fuel mixture resulted from the prolonged ignition delay and the superior evaporation characteristics. This resulted in lower NOx and Smoke emissions with JP-8. With EGR, JP-8 also showed an improved trade-off relationship between NOx and Smoke emissions compared with diesel fuel due to its better evaporation characteristics which made the air-fuel mixture more homogeneous and leaner and lower aromatic contents. However, the ‘EGR sensitivity’, which is defined as the level of CA 50 retardation and increase of ignition delay according to the EGR rate, was lower for JP-8 compared to diesel fuel. In other words, the combustion phase with JP-8 was less affected by the EGR.

PreviousDonghoon Kim, Kihyun Kim, Choongsik Bae, “Comparison of Spray Structures of Diesel and Gasoline Using Modified Evaporation Model in Openfoam CFD Package”, SAE paper 2014-01-1417, presented at SAE 2014 World Congress & Exhibition, Detroit, April, 2014
NextJoonsik Hwang, Yongjin Jung and Choongsik Bae, “Comprehensive assessment of soot particles from waste cooking oil biodiesel and diesel in a compression ignition engine”, SAE 2015 World Congress & Exhibition, Detroit, April, 2015

Leave a Reply

What's on Your Mind ?