Theoretical Analysis And Experimental Research On Decreasing Emissions Of SOFIM Diesel Engine

Diesel engines are widely used in traffic engineering machine for its high thermal efficiency and reliability. The emission problem of diesel engines is more serious as emission standards around the world become more severe.Hioyadu—Kadota burning model is selected, simulating software is developed which is used to predict NO_x by generating mechanism of Zeldovich-NO and structure parameters of SOFIM diesel engine, and the NOx emission can be predicted by this software.As main structure parameters of SOFIM diesel engine aren't changed, optimization matching method is used to decrease emissions by changing external attachments and adjusting parameters of fuel supply system. The experimental research on optimization matching is used by the single factor replacement. Turbocharger, nozzle, fuel pump, and fuel delivery advance angle are selected as matching factor. To decrease emissions of the diesel engines an experimental scheme of optimization matching is designed with the replacement sequence method.Emissions have been measured along with GB17691-2001, as the matching factors change. The reasons and regulations relating to emissions have been analyzed, and the optimizing explains also have been searched. It indicates that the turbocharger which increase inlet pressure can decrease PM and restrain NO_x, the nozzle with properly larger diameter can reduce NO_x, and doesn't increase PM emission evidently, enlarging plunger diameter can increase fuel pressure and decrease PM, moderating fuel delivery advance angle can depress burning temperature and control NO_x.