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Numerical study on Premixed Charge Compression Ignition(PCCI) combustion for down-sized Diesel engine using CONVERGE
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 30, 2020 by SAE International in United States
The growing EV market and tougher EURO VI regulations require to further reduce the presence of diesel engines. However, diesel engines still have the advantages in high performance and high thermal efficiency, while It produces NOx and PM. Therefore, diesel engines should recognize the need for change. It is important to improve and practicalize innovative combustion technologies that can improve fuel efficiency without losing power in consideration of emission regulations. In that point view, the new combustion technology have been studied such as Premixed Charge Compression Ignition(PCCI) . This combustion technology can reduce both NOx and PM emissions through longer mixing time and Low Temperature Combustion(LTC) by applying advanced injection than conventional diesel combustion, In this study, numerical analysis for PCCI engine is performed to optimize injection angles that can reduce wall wetting, increase fuel efficiency and reduce emissions. Injection angle is independent parameters in the range of angles 30 °, 60 °, 90 °, 120 °. Firstly, 1D simulation program was used for the validation of the diesel engine. In order to secure high reliability through visualization, a cylinder shape was created using a numerical simulation 3D CFD CONVERGE program. The program uses the Navier-stokes equation for fluid analysis and SAGE model for combustion analysis as governing equation. As a result, it was confirmed that the advanced injection could increase the mixing time and the narrow injection angle could reduce the wall wetting, improve combustion performance and reduce exhaust gas. The final goal of this study is to develop the Range Extended Electric Vehicle(RE-EV), a efficient method of extending distance range among hybrid vehicles that can maximize efficiency through realization of ZEV pursuing clean diesel through PCCI and electrification of down-sized diesel engine. It is expected to sustainable grow of diesel market through down-sizing and electrification.