Numerical Simulation And Experimental Study Of Optimzation Of Coumbustion Parameters In A Electronic High Pressure Common Rail Diesel Engine

In modern industry,diesel engines need to improve power and economic performanceand also need to meet the more stringent emission regulations. Therefore, the optimizationof combustion parameters in order to improve the power of the diesel engine andeconomic performance, at the same time, reducing NOx and Carbon smoke emission havebecome the focus of the internal combustion engine research..Based on a high pressure common rail, electric control of heavy duty turbochargedinter-cooled diesel engine, seted the numerical simulation model, the combustion systemparameters:pilot fuel injection quantity, pilot injection angle, swrilt ratio, the spray angle.The influence of these parameters during the working process and their influences topower, economic performance and emission performance were researched. Based on theresults of numerical simulation, did experiments using different injection strategies inorder to research how these parameters influenced engine performance.Numerical simulation results show that appropriate pilot fuel injection quantity:2mgand time:the best angle between the pilot and main injection9°CA playing a decisive rolefor the generation of mixture in cylinder, gas movement and combustion process, also itsinfluence to engine power performance is evident, pilot fuel injection quantity can be usedto balance the production of Nox and SOOT emission.Swril ratio will increase the gasflow in cylinder, the mixtured gas inside cylinder will be more uniform, and indicatedpower increases, the Nox emission increased, the right swril ratio can keep a good balanceon Nox and SOOT emission. At the same time the experiment study found that appropriatelate injection quantity and angle had a good result to oxidize carbon smoke, thereforereduced carbon smoke emissions.The advantage of this paper is that based on the work of others, researched theinfluence of different combustion parameters for diesel engine during the working process,through the test we verified the theory, and provides some theoretical basis for the wokingto choose and optimization of combustion parameters matching in diesel engine.