Research On The Influence Of The Physical And Chemical Characteristics Of Mixed Fuel On The Combustion And Emission Characteristics Of Diesel Engines Based On The State Of Intake Oxygen Concentration

Diesel engines are widely used in construction machinery and heavy-duty vehicles.The particulate matter and NOx brought by diesel engines have long been the research difficulties and hotspots of scientific researchers all over the world.With the stricter emission regulations and the exhaustion of petroleum fuels,humans have to seek alternatives.But n-butanol stands out among various alcohol fuels and is an extremely suitable alternative fuel for diesel engines,with both power and good emissions.In this paper,on a modified single-cylinder engine of a 6-cylinder high-pressure common rail diesel engine,by simulating supercharging and cooperating with EGR technology,based on different intake oxygen concentrations,the effect of the physical and chemical properties of the mixed fuel on the combustion state and emissions of the diesel engine is studied.The study concluded:1.The stagnation period has a major effect on Soot emissions.Shortening the stagnation period will promote Soot emissions,and as the intake oxygen concentration decreases,the degree of influence gradually decreases;a certain fuel-oxygen ratio has a greater suppression of Soot As the intake oxygen concentration decreases,the degree of influence gradually increases;the latent heat of vaporization has almost no effect on Soot.2.The stagnation period has a greater impact on NOx in the entire intake oxygen concentration range;the influence of a certain fuel-oxygen ratio on NOx increases with the increase in intake oxygen concentration;the latent heat of vaporization is in the medium-lean oxygen range It has little effect on NOx.3.The degree of influence of the stagnation period on THC increases with the decrease of intake oxygen concentration;the degree of influence of a certain fuel-oxygen ratio on THC decreases with the decrease of intake oxygen concentration;the degree of influence of latent heat of vaporization on THC decreases with the decrease of intake oxygen concentration.It decreases as the intake oxygen concentration decreases.4.The stagnation period has a decisive influence on CO in the entire intake oxygen concentration range;the latent heat of vaporization and a certain fuel-oxygen ratio have little influence on CO.