The Experiment Research Of Low Temperature Premixed Combustion On Diesel Engine

At present, energy saving and environment protection are two important projects in world engineering field. As one of the most effective solutions on energy and environment problems, new diesel combustion technology invited increasingly attention from engineering field.Based on the research of conventional diesel combustion and the analysis of diesel HCCI combustion, this thesis presents a new diesel combustion concept - diesel low temperature premixed combustion. In this kind of combustion, water emulsification was used to substitute EGR, which is widely applied to decrease combustion temperature and reduce NOx emission. An online emulsification apparatus was developed to provide emulsified fuel to diesel. With modification on fuel supply system and combustion system, the author studied the combustion characteristics of the new combustion on 1135 type single cylinder test engine.This thesis analyzed the effect of compression ratio, start of fuel injection and fuel property on diesel combustion temperature, fuel consumption and emission. The application of emulsified fuel and substitute fuel on diesel low temperature premixed combustion was studied. The results of the experiment show that with the application of pilot fuel injection and fuel property modification, the start of combustion was controlled, the maximum cylinder pressure was decreased, and the approximate equivalent pressure combustion was realized; fuel economy of the test engine was much improved, meanwhile NOx and PM emissions were decreased to a great extent.