Abstract
Abstract: Miller cycle is considered as an effective means to meet the regulation on Tier Ⅱ and to reduceCO 2 emission. For this cycle, the amount of intake air supplied should be enough increased. Therefore, theintake system with minimized resistance for air flow is under consideration. In this study, the flow coefficients of intake valves were measured in order to obtain the basic data for the cycle simulation andintake port design. The flow coefficients were measured using the steady-flow test rig. As a test result forthe poppet valve used the marine engine with medium speed, the flow coefficients are increased to about0.62 with the valve lift. In addition it is confirmed that the flow coefficients have the characteristic valueirrelevant to the S/B ratio. Key words: Flow coefficient, Intake valve, S/B ratio, Steady-flow, Volume flow rate †교신저자(STX종합기술원 연소성능팀, E-mail: pivboy@onestx.com, Tel: 055-210-3385)1 STX종합기술원 연소성능팀2 창원대학교 전기공학과 대학원3 창원대학교 조선해양공학과 1. 서 론 최근 원유가 인상 및 전 지구적 환경오염 규제 강화는 저배기 및 고효율 기관 개발의 필요성을 증진시키고 있다. 특히 국제해사기구의 Tier Ⅱ 발효 및 지구온난화현상에 따른 CO
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