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[학술강연] 대형 디젤기관 최적 운전 조건 선정에 관한 연구
김기두(Ki-Doo Kim),김동훈(Dong-Hun Kim),윤욱현(Wook-Hyun Youn),강상립(Sang-Lip Kang),권오신(O-Shin Kwon) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
This study is performed to assess the predictive quality of the performance simulation on a large diesel engine, 7K98MC. The fuel injection system and exhaust valve driving system analysis are also performed to get the fuel injection rate and the exhaust valve lift which are important for reliable result of the performance simulation. All simulation results are compared with measured data to confirm the modeling methods and these results.<br/> The performance simulation is performed with varying exhaust valve open time, compression shim and fuel injection time to investigate the effects of these operating conditions on the 7K98MC engine performance. Finally, the optimum operating conditions are selected in respect of fuel oil consumption and NOx emission.<br/>
대형 디젤 엔진의 연료 노즐에 따른 3차원 연소특성 연구
윤욱현(Wook-Hyeon Yoon),김기두(Ki-Doo Kim),하지수(Ji-Soo Ha),강상립(Sang-Lip Kang) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
Numerical simulations have been carried out to investigate the effect of fuel spray angle on the combustion characteristics of the large diesel engine, 6S90MC-C. Spray and combustion phenomena were examined numerically using FIRE code. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation processes. Predictions on the cylinder peak pressure and NOx emission were first verified with the experimental data to confirm the reliability of numerical calculations. The comparison results showed good agreements within the range of 2 bar and 4.2% respectively. Finally, the effects of fuel spray angle on the engine performance were investigated numerically to find the optimum spray angle considering fuel consumption, NOx emission and heat flux of the combustion chamber wall. It was concluded that the case of the only one injector hole having the opposite direction from swirl was the best one for engine performance.