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GDI엔진의 흡기계통에서 엔진 회전수 변화에 따른 입자상물질 (PM) 퇴적에 관한 수치해석 연구
나경태(kyong-Tea Na),김철호(Chul-Ho Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
The use of GDI engines has become popular to improve the output power, and fuel efficiency of gasoline engines. However, the sediment formed in the combustion chamber flows into the intake manifold through the PCV valve with the blow-by-gas of the GDI engine and deposits on the intake valves and ports and finally affects the engine performance and efficiency due to the flow resistance in the intake system. In this study, the reason of the sediment accumulation and its location in the intake valve with the engine speed was studied with CFD numerical analysis technique. From the study, it was found that the flow circulation formed on the surface of the intake valve stem is the main source of energy to hold the particles in the region and stick on it. For the DOHC system, the inducted speed of the incoming air is the highest at the coupled region of two intake valves. In the location, the circulation speed on the valve stem surface is highest and this could be the reason for more particles accumulated in the region. For further study, it is needed to find a way to get rid of the circulation flow region at the intake valve stem to have minimum particles accumulated at the entry of the intake ports and valves of GDI engines.
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