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스월 제어 밸브를 적용한 직접분사식 가솔린 엔진의 희박연소 특성
이민호 ( Min Ho Lee ),문학훈 ( Hak Hoon Moon ),차경옥 ( Kyung Ok Cha ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.2
N/A The performance characteristics of lean burn system in gasoline engine are mainly affected by the air-fuel mixture in cylinder, gas exchange process of manifold system, exhaust emission of engine, and the electronic engine control system. In order to obtain the effect of performance factors on the optimum conditions of lean burn engine, this study deal with the behavior of mixture formation, gas flow characteristics of air, flow and evaporation analysis of spray droplet in cylinder, vaporization and burning characteristics of lean mixture in the engine, and the control performance of electronic engine control system. The optimum flow conditions were investigated with the swirl and tumble flows in the combustion chamber with swirl control valve. The performance characteristics and optimum condition of flow field in intake system were analyzed by the investigation of inlet flow of air and combustion stabilization on cylinder.
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이색 PIV 기술을 이용한 5밸브 가솔린엔진 연소실 내의 유동특성 분석
이기형,우영완,박상찬,이창식,Lee, Gi-Hyeong,U, Yeong-Wan,Park, Sang-Chan,Lee, Chang-Sik 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.2
A 5-valve(intake 3-valve) engine has been developed to increase engine performance. These engines have a high power caused by the decrease of inertia mass of an intake valve and the increase of intake effective area. In this study, in-cylinder flow patterns were visualized with laser sheet method and velocity profiles at near intake valves were inspected by using a two-color PIV. In addition, steady flow tests were performed to quantify tumble ratio of flow-fields generated by a tumble control valve(TCV). Experimental results of steady flow test show that the cure of tumble ratio in intake 3-valve engine farmed as a S shape with valve lift changes. This tendency is different from the one in intake 2-valve engine. Using laser sheet method and two color PIV method, we can find that the intake flow through upper valve increases and the velocity gradient also slightly increases as valve lift increases. From this study, the in-cylinder flow characteristics around intake valves were made clearly.
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李珉湖,尹俊圭,車京玉 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
Lean burn gasoline engine, classified into port injection and direct injection, is recognized as a promising way to meet better fuel economy. Especially, gasoline direct injection engine is becoming increasingly popular due to their potential for improved fuel economy and emissions. Also, GDI engine has the advantages of higher power output, higher thermal efficiency, higher EGR tolerance due to the operation characteristics of increased volumetric efficiency, compression ratio and ultra-lean combustion scheme. However, GDI engine has many difficulties to be solved, such as complexity of injection control mode(fuel injection timing, injection rate), fuel injection pressure, spark timing, unburned hydrocarbon and restricted power. This study aims to develope fundamental key techniques for the lean burn in GDI engine. The techniques in this study include intake port design (SCV) and test method. Experimental is applied to investigate the effects of swirl control valves to improve the engine performance and emission, efficiency in GDI engine.
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