Fuel injection characteristics of diesel-stimulated natural gas combustion

Although dual-fuel (DF) engines using a low cetane number primary fuel such as natural gas (NG) ignited by a pilot diesel spray have been the subject of much investigation over years, there are still many unknown problems rel ated to the fundamental combustion process of two fuels. In this work, a qu iescent constant volume combustion bomb and a 3-D numerical model have been used to study the effects of injection nozzle characteristics on the combu stion of pre-mixed NG/air with pilot distillate spray. Experimental tests w ere conducted on combustion process of pre-mixed natural gas/air with pilot injection pressure of 30 and 20 MPa with a 4 hole injector, and also with injector nozzle of 8 and 4 holes. The global results obtained from computat ions compared well with the experimental results. Copyright (C) 1999 John W iley & Sons, Ltd.