Combustion and Emission Characteristics of Embarked Aircraft Turbine Fuel (JP-5) with Injection Timing Control

This study analyzes the combustion and exhaust emission characteristics with fuel injection timing control by applying JP-5 to a common-rail direct injection diesel engine. JP-5 is suppled to embarked aircraft that are loaded on naval vessels for maritime operational mission. As the fuel injection timing was retarded, the maximum in-cylinder pressure, the maximum rate of pressure rise, and the maximum rate of heat release tended to decrease. As the fuel injection timing approached the TDE, the indicated mean effective pressure and combustion efficiency improved. The ringing intensity, which can be used to quantitatively evaluate the engine noise and vibration level, decreases as the fuel injection timing changes from advanced to retarded. The injection delay period of JP-5 under 30 MPa was approximately 0.53 ms. The spray pattern of JP-5 was less symmetric in the initial stage of injection. The forcible oxidation reaction by retarded fuel injection timing reduces the O₂ concentration in the exhaust gas but increases CO₂ emissions. CO was reduced by oxidation activation, and NO, the main source of NO, decreased with decreasing heat release.