内燃机工程.pdf

1 Chinese Internal Combustion Engine Engineering 430074 Characteristics Abstract: In this paper the spray characteristics of liquefied petroleum gas (LPG) are investigated by using high speed photography and quasi-dimensional gas jet model. Good agreement exists between the experimental data and calculated results. The results of the experiment and simulation reveal that under conditions of the same nozzle hole diameter and back pressure, the higher the injection pressure, the larger the spray cone angle and the faster the decline rate of centerline concentration of the spray, while more or less the same in decline rates of centerline velocity and spray penetration. Under conditions of the same nozzle hole diameter and fuel injection pressure, the higher the back pressure, the shorter the penetration of the spray, the larger the spray cone angle, and the faster the decline rate of centerline velocity and concentration of the spray. It is shown that the effects of back pressure on penetration, spray cone angle, and decline rate of centerline velocity and concentration of the spray are bigger than that of fuel injection pressure. Keywords: Liquefied Petroleum Gas (LPG) High Speed Photog