Simulative Investigation On The Exhanst Gas Reedrculation System Of Turbocharged And Intercooled Diesel Enginet

Along with social progress and rapid development of modern industry, energy andenvironmental issues has gained more and more attention. Now all over the world strict emissionregulations have been developed and implemented, which also put forward increasingly demandto the internal combustion engine technology. In diesel engines, nitrogen oxides (NOX) emissionsaccount for about 53% of the total emissions. Therefore, control of nitrogen oxides is veryimportant.In this paper, Perkins 150Ti Series Turbocharged and intercooled Diesel Engine with EGRsystem to reduce NOx emissions was studied simulatively, mainly for the following aspects:(1)Analysised the feasibility of turbocharged diesel engine with EGR technology, decidedto use high-pressure loop, that is, leads the exhaust from before the turbine compressor into thepost-intercooler. To ensure the exust gas lead into the inlet manifold successfully, the Venturitube was used as a pressure-relief device .(2)Used CFD software to optimize the Venturi tube structurally and simulatemulti-cylinder EGR distribution uniformity. Best structure of the Venturi tube was obtained bythe optimization; Steady-state and transient simulation results show that the distribution of eachcylinder exhaust gas is basicaly uniform.(3)Analyzed impact of the different EGR rate on the economy, power and emissionsunder different load and speed; Simulated the various conditions of optimal EGR rate.Simulation and bench test with thirteen working conditions show that exhaust gas recirculationcombined with intercooled system is able to meet the Euro IV regulations on NOx and SOOT.