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중형 디젤엔진의 터보챠저 과급 시스템 최적화에 관한 연구
윤욱현,길상학,하지수,김호익,김주택,김기두,Youn Wook-Hyun,Gal Sang-Hak,Ha Ji-Soo,Kim Ho-Ick,Kim Ju-Tae,Kim Ki-Doo 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
In order to improve engine performance while overcoming the weak points of Pulse and MPC(Modular Pulse Converter) turbocharging system, a new turbocharging system. "Hi-Pulse system", has been introduced and developed for medium speed diesel engine. HYUNDAI HiMSEN engines. Hi-Pulse system is to utilize not only the benefits of MPC system at higher load but also the ones of Pulse system at lower load. As for the results. the specific fuel oil consumption and NOx emission were lowered compared with the Pulse and MPC system. Performance simulation were carried out to optimize intake and exhaust timing and exhaust duct arrangement and to improve the performance of Hi-Pulse system engine.em engine.
윤욱현(Wook-Hyun Youn),신상백(Sang-Baek Shin),류승협(Seung-Hyup Ryu),박영호(Young-Ho Park),이영철(Young-Chul Lee) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
The basic design procedures of the scoop system for cooling main condenser of a LNG carrier were reviewed. The application procedures of the experimental results from Hewins and Reilly as well as the verification method of the design for the scoop system were also studied, and the program which is able to perform the basic design calculations was developed. Using the developed program, the designs of the scoop system installed in the previous LNG carriers were examined. Through flow measurement of 137K LNG carrier sea trial and CFD of simulation, we verified scoop system design of LNG carrier. Finally, the developed program was applied to the design of new LNG carrier.
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.
1.7 MW급 PPS(Packaged Power Station)에 대한 환기유동 해석
윤욱현(Wook-Hyeon Yoon),하지수(Ji-Soo Ha),이영식(Young-Sik Lee) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
The computational study of ventilation air flow in 1.7 MW PPS(Packaged Power Station) is carried out to validate the characteristics of heat transfer and flow in container box. To blow the open air into the PPS, four ventilation fans are located in the axial direction and to stop out the noise of a engine and generator, ventilation holes are pierced at the lower part of the inside wall and at the upper part of the outside wall of the container box. The releasing heat sources in container box are generator and engine block. To measure the surface temperature of engine block, infrared camera was used and the temperature of it was applied to boundary conditions. To approximate the heat pickup from the radiator core surface, the heat flux inside the radiator is calculated and added to the energy equation as an energy source terms. Instead of geometrically modeling the fan blades, the momentum generated by the fan is derived and added to the momentum equation as source terms. We analyzed three computational cases with the direction of air flow and recommend case 3 in this study. Also, experiment for case 1 has been carried out and the results are compared with the computational results. Reasonable agreement was found, which suggested that the employed numerical model had its credibility in actual PPS ventilation air flow.
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.
윤욱현(Wook-Hyeon Yoon),박종일(Jong-Il Park),정성수(Sung-Soo Jung),김대웅(Dae-Woong Kim),하은(Eun Ha) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Numerical studies on optimal design of combustion system for high-speed diesel engine, which is mainly used for power generation or ship propulsion, have been carried out to meet the target value of fuel oil consumption and IMO(International Maritime Organization) Tier2 NOx regulations. The spray visualization experiment was performed in the constant-volume high-pressure chamber to clarify the numerical results on the spray characteristics of the spray angle and penetration for medium-speed diesel engine having the same bore size. The intake/exhaust valve timing and turbocharger specifications were determined from the results of 1-D performance analysis. The nozzle configurations of the unit injector, fuel injection rate, piston bowl shape and compression ratio were determined from the results of 3-D in-cylinder combustion analysis. The intake swirl port geometry was developed from the results of 3-D flow analysis to improve the rate of fuel-air mixing and the velocity of diffusion flame for the reduction of fuel oil consumption. Finally, engine performance of the combustion system designed by numerical analysis was verified from the experimental results.