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GT-Power를 이용한 흡기 매니폴드 및 밸브 타이밍 최적화에 관한 연구
노종원(Jongwon Noh),김충식(Choongsik Kim),민선기(Sunki Min),이중구(Chonggoo Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper describes the optimization methodology of intake manifold geometry and valve timing by using 1D CFD and DOE. Since the engine performance is highly affected by intake manifold and valves, we have to determine appropriately the design parameters of intake manifold geometry and the valvetrain system. Among the design parameters are plenum volume, runner length, runner diameter for intake manifold and the valve timing and durations for valvetrain system. For these design parameters are closely coupled in their impacts on engine performance, 1D CFD virtual engine simulation can be used efficiently and effectively to predict engine performance with regard to various design change. In this research, 1D CFD and DOE was used to determine appropriate intake manifold geometry and valve timing before prototype components machining. Genetic Algorithm was used to get the optimized manifold geometry and valve events. Simulation results showed that intake valve timings were varied by about 20 cam angle according to the engine speed while the exhaust events were varied within 5 cam angle at the engine speeds higher than 2200rpm. Also, the engine performance was predicted to be improved by the late intake valve events to a great extent. Finally, up to 13% of the output increase could be achieved through the optimization of the intake manifold and valvetrain.
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