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디젤 엔진에서의 흡기 다기관 형상 변경에 따른 성능, EGR 분배율 및 배출가스 변화에 관한 연구
강용헌(Yonghun Kang),최동훈(Donghoon Choi) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.6
The principle of exhaust gas recirculation (EGR) is that the exhaust gas can be used as an oxygen-depleted gas to be mixed with the fresh, oxygen-rich air and recirculated into the combustion chamber. EGR is a very efficient technology for reducing NOx without any strong adverse effects on other exhaust emissions, thus it is widely used. EGR rate of each cylinder should be as uniform as possible to satisfy the stringent emission regulation. If there are differences in EGR rate between cylinders, there would be emission deviation even with the same fuel injection. In this study, we predicted the effect of the intake manifold shape modifications on the engine performance and EGR distribution rate by using computational fluid dynamics and compared with engine experimental results.
디젤 엔진에서의 터보 차저 Blow 소음 저감 위한 시뮬레이션 기반 공명기 위치 최적화
강용헌(Yonghun Kang),최동훈(Donghoon Choi) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.2
A diesel engine is equipped with a turbocharger for providing more power at a low engine speed region by supplying charge air to combustion chambers. The turbocharger makes it possible to satisfy stringent emission regulations and customers' demand of enjoying the fun to drive by increasing engine performance. However, the turbocharger has the disadvantage of making BPF(Blade Passing Frequency), hissing, surge, whistle, and blow noises. Among them, reducing the blow noise, a narrow-band noise(a general range : 1800~2000㎐), is possible by using a resonator that controls the narrow frequency band governing the resonance in the intake system. In this study, the optimum location of the resonator is found by employing Boost as a CAE(Computer Aided Engineering) tool and is confirmed by experiments of an engine dynamo test and a real vehicle test.
가솔린 엔진의 성능, 연비, 배출 가스를 동시에 고려한 시뮬레이션 기반 흡기 다기관 길이 최적화
강용헌(Yonghun Kang),최동훈(Donghoon Choi) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.5
Exhausting fossil fuel and increasing concern of air pollution have brought on the change of the focus of developing new vehicles from performance to fuel economy and emission. The gasoline engines adopting the naturally aspirated way use the throttle-body for engine load control. Therefore, its pumping loss increases more than that of the diesel engine, and also mostly operating in a partial load condition has bad influence on fuel economy and emission. In these days, the continuous variable valve timing system and variable induction system are adopted in order to improve fuel consumption and emission. In this study, we optimize the runner length and operate region of variable induction system to simulataneously improve the performance, fuel economy, and emission of gasoline engine with employing GT-Power as a CAE tool for engine analysis and PIAnO as PIDO tool for process integration and design optimization.
직렬6 기통 가솔린 엔진의 플라스틱 흡기 매니폴드의 설계
박장혁(Janghyuck Park),강용헌(Yonghun Kang),박문걸(Munkeol Park),홍성준(Sungjun Hong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In order to change a manufacturing process, the plastic air intake manifold had to be modified with the runner length and diameter because of package problems. The original process is "Lost-Core" and the new one is "Vibration-Welding". The reverse engineering has been done through scanning the original intakemanifold. And scatter bands of the design parameters were picked up. The computation fluid dynamics (CFD) and the onedimensional engine performance simulation are showed in this paper. In addition this study would like to show how to put an output from an analysis work into a design process.