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엔진 흡기시스템 개발 시 사용하는 텀블유동 시험장치의 고찰
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Tumble flow test rig has been used as the useful tool in the developing intake system because major flow pattern induced by intake port of DOHC engine is tumble. Angular momentum of in-cylinder tumble flow can not be directly measured by impulse torque meter in the test rig like that of in-cylinder swirl flow due to rotational axis of the flow. Therefore the adaptor to transform tumble to swirl flow must be adapted in the test rig. In this study, using the commercial CFD code STAR-CD, we studied the effects on measured results due to the variation of the major design variables in the adaptor, tube length (L), tube diameter (D) and cylinder height(H). The effect of the attached angle(θ) of the test head to the adaptor also was simulated.
가변 흡기시스템에 의해 유도되는 흡입공기의 유동특성 평가를 위한 새로운 3차원 회전유동 지수 관한 연구
윤정의(Jeong-Eu Yun),남현식(Hyeon-Sik Nam),김명환(Myung-Hwan Kim),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
It is very important to clarify the 3-D angular flow characteristics of in-cylinder bulk motion in the developing process of variable induction system. In-cylinder flow induced by variable induction system is very complex, so we can not describe the in~cylinder bulk flow characteristics using the conventional swirl or tumble coefficient. In this study, we introduced the new 3-D angular flow index, angular flow coefficient(N_B), for in-cylinder bulk flow characteristics. And also, to confirm the index, we carried out the steady flow rig test for intake port of test engine varying valve lift on the test matrix.