G0700303 Improvement of Engine Performance with High Injection Pressure of Diesel Fuel in a Natural Gas Dual Fuel Compression Ignition Engine

Abstract

The effect of injection pressure of diesel fuel on the engine performance in a dual fuel compression ignition engine with natural gas as a main fuel was investigated at low and high engine loads. With increasing in the injection pressure of diesel fuel, the unburned loss decreases and the thermal efficiency improves. In a low load operation, the NOx emissions decrease with increasing in the injection pressures. In a high load operation, lower intake oxygen concentrations with cooled EGR and higher intake pressures with supercharging are necessary to suppress the increases in the NOx emissions and in the maximum rate of pressure rise, maintaining small unburned losses and high thermal efficiencies.