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중형 디젤 엔진의 연료분사노즐 형상에 따른 성능 해석 연구
김기두,윤욱현,김병석,하지수,안광헌,김주태,Kim, Ki-Doo,Youn, Wook-Hyun,Kim, Byong-Seok,Ha, Ji-Soo,Ahn, Kwang-Hean,Kim, Ju-Tae 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.6
The effects of fuel injection nozzle hole on the NOx emission and fuel oil consumption of medium speed diesel engine HYUNDAI HiMSEN 6H21/32 engine are investigated by engine performance simulation. The results of performance simulation are verified by experimental results of NOx omission fuel oil consumption, cylinder pressure, and heat release rate according to the variation of the number of fuel injection nozzle hole and engine load. The performance simulations are also carried out to optimize the fuel injection nozzle of 6H21/32 engine in respect to the NOx emission and fuel oil consumption. The engine performance measurements are performed to verify the results of performance simulation and to investigate the effects of fuel injection nozzle on engine performance. The results of measurement indicate that significant NOx reduction can be achieved with minimum deterioration in fuel oil consumption by optimizing the geometry of fuel injection nozzle on 6H21/32 engine.
연료분사 노즐 형상이 선박용 중형 디젤 엔진의 NOx에 미치는 영향 연구
윤욱현(Wook-Hyeon Yoon),김병석(Byong-Seok Kim),류승협(Sung-Hyup Ryu),김기두(Ki-Doo Kim),하지수(Ji-Soo Ha) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
Multi-dimensional combustion analysis and experiment has been carried out to investigate the effects of the injector nozzle hole diameter and number on the NOx formation and fuel consumption in HYUNDAI HiMSEN engine. The behavior of spray and combustion phenomena in diesel engine was examined by FIRE code. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation. Wallfilm model suggested by Mundo, et al. and auto-ignition model suggested by Theobald and Cheng were adopted to investigate the spray-wall interaction characteristics and ignition delay. The information of spray angle and spray tip penetration length was extracted from fuel spray visualization experiment and the fuel injection rate profile was extracted from fuel injection system experiment as an input and verification data for the combustion analysis. Next, the nine different nozzle configurations were simulated to evaluate the effect of injector hole diameter and number on the NOx formation and fuel consumption.
최성욱(Seong Wook Choi),윤욱현(Wook Hyoen Yoon),이용석(Yong Seok Lee),김병석(Byong Seok Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Predicting piston temperature is an essential part of piston design process. Recent trends on increasing specific power of marine diesel engine require more effective thermal management of piston for the desired durability and reliability. It depends on how thermal boundary conditions of piston bowl and cooling gallery are correctly determined to predict overall temperature distribution of piston accurately. Specially, thermal load condition of piston bowl and heat dissipating condition of cooling gallery are most influential factors in piston heat transfer analysis. In this study, a proper approach to set thermal boundary condition of piston bowl was suggested from the results of 3-D in-cylinder combustion analysis and a numerical procedure using CFD was developed to simulate cooling process and estimate heat transfer coefficient inside cooling gallery. One of the Hyundai HiMSEN engine models was chosen to validate the analysis procedure. The predicted results showed a reasonable agreement with experimental results.