Experiment Research on Performance of Vehicle Diesel Engine with Spraying Vapor in Intake Manifold

Using the excess heat of exhaust gas to heat the water to vapor, by spraying the vapor into intake manifold to join combustion, the performance of vehicle diesel engine has been researched. The experimental results demonstrate that the bsfc of experimental engine cannot be reduced markedly, the temperature of exhaust gas for experimental engine is lower than that of original engine, the torsion of experimental engine is smaller than original engine when rev is lower than 1800rpm, while the torsion is bigger when rev higher than 1800rpm, and the maximum advance is 57.4%, when experimental engine work in rated load, the NOx can be reduced from 9.0 g/kWh to 7.1g/kWh, the maximum reduction is 22.2%, the CO emission varies with the rev, but the total trend is decreased as rev increasing, the HC emission of experimental engine is lower than that of original engine, the maximum reduction is 3.7%. Little modification of the engines and independent spraying vapor system are the advantages of this method.