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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.
단일 영역 모델 열발생율 계산 방법의 개선에 관한 연구
김기두,윤욱현,하지수,류승협,Kim Ki-Doo,Yoon Wook-Hyeon,Ha Ji-Soo,Ryu Seung-Hyup 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
Accurate heat release analysis of cylinder pressure data is important for evaluating performance in the development of diesel engine However, traditional single zone first law heat release model(SZM) has significant limitations due to the simplified assumption of uniform charge and neglecting local temperature inside cylinder during combustion process. In this study. heat release rate based on single zone heat release model has been evaluated by comparison with computational analysis results using Fire code which is based on multi-dimensional model(MDM). To overcome limitations due to simplicity of single zone assumption. especially the influence of specific heat ratio on gross heat release has been esteemed and newly suggested were the equation $\gamma$= $\gamma$(${T/T}_{max}$) which describes the variations of gases thermodynamic properties with mean temperature and maximum mean temperature inside cylinder Single zone heat release model applied with this equation is shown to give very good results over whole range of operating conditions when compared with computational analysis results based on multi-dimensional model.
대형 디젤 엔진의 연료 분사 노즐 형상이 NOx 발생량 및 연료소비율에 미치는 영향 연구
김기두,하지수,윤욱현,Kim Ki-Doo,Ha Ji-Soo,Yoon Wook-Hyeon 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
Numerical simulations have been carried out to investigate the effect of nozzle hole geometry on the combustion characteristics of the large diesel engine. 6S90MC-C. Spray and combustion phenomena were examined numerically using FIRE code. Wane 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 0.64% and 4.6% respectively. Finally, the effects of fuel spray angle and diameter on the engine performance were investigated numerically to find the optimum nozzle hole geometry considering fuel consumption, NOx emission and heat flux of the combustion chamber wall. It was concluded that the combustion gas recirculation in cylinder by changing fuel injection direction is an effective method to reduce NOx emission by about 10% with increasing fuel oil consumption, 1.4% in a large diesel engine.
중형 디젤 엔진을 위한 하이펄스 터보챠저 과급 시스템 개발
김기두(Ki-Doo Kim),윤욱현(Wook-Hyun Youn),갈상학(Sang-Hak Gal),하지수(Ji-Soo Ha),김호익(Ho-Ick Kim),김주태(Ju-Tae Kim) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
In order to improve engine performance while overcoming the weak points of 2-Pulse and MPC(Modular Pulse Converter) turbocharging system, a new turbocharging system, Hi-Pulse system, has been introduced and developed for medium speed diesel engines, 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. Therefore, the specific fuel oil consumption and NOx emission were lowered when comparing with the 2-Pulse and MPC system.<br/> Performance simulation carried out to optimize intake and exhaust timing and exhaust duct arrangement and improve the performance of Hi-Pulse system engine.<br/>
김기두(Ki-Doo Kim),윤욱현(Wook-Hyun Youn),김동훈(Dong-Hun Kim),하지수(Ji-Soo Ha) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
This study is performed to assess the predictive quality of the 3-dimensional combustion analysis on a large diesel engine, 7K98MC. The fuel injection system and scavenging flow analysis are also performed to get the fuel injection rate and the swirl ratio of fresh air induced in cylinder, which are important data to get reliable results of the combustion analysis.<br/> Fuel injection simulation results are verified with experimental data of fuel injection pump and valve pressure. Combustion analysis results are also verified with experimental data of heat release ~ate and cylinder peak pressure in error 5% and 1bar respectively. Therefore it is concluded that the fuel injection and combustion simulation models are well constructed. Combustion analysis results show that the injected fuel droplets of the 7K98MC engine are relatively well distributed in the combustion chamber.<br/>
[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/>
김기두(Ki-Doo Kim),갈상학(Sang-Hak Ghal) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
This study is performed to evaluate the effect. of Top Dead Center(TDC) determination on engine performance in the case of TDC setting by fuel cut. Adiabatic motoring conditions of engine cylinder are compared with real conditions to investigate the effects of heat loss on thermodynamic loss angle by engine performance simulation software, BOOST. The variation of heat release rate and Indicated Mean Effective Pressure(IMEP) is investigated with changing TOC crank angle.<br/> The results show that total heat release rate in cylinder has 5% error rate by 1 degree error of TOC determination in medium speed diesel engine. IMEP also has 7% error rate by 1 degree error of TOC determination. Finally we can conclude TOC setting error can reduce by TOC determination procedure during lower heat loss engine operating conditions from cylinder. These engine operating conditions are higher engine speed, lower load and higher coolant temperature.<br/>
A Study of Optimization of NOx and SFOC on Medium Speed Diesel Engines
김기두(Ki Doo Kim),윤욱현(Wook Hyeon Yoon),하지수(Ji Soo Ha),김종석(Jong Suk Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
An engine performance and combustion simulation has been carried out to investigate effective methods for NOx and specific fuel oil consumption(SFOC) reduction on medium speed diesel engines. The simulation results show that lowering the charge air temperature by 10℃, will decrease the NOx emissions by 10%. Also, Miller cycle is evaluated by performance simulation to reduce NOx emissions and SFOC at the same time. The fuel injection nozzle hole diameter, number and injection angle have been optimized to reduce NOx emissions through combustion simulation. The engine measurements have been performed to verify the performance and combustion results and to investigate the effects of the selected parameters on engine performance. The results of measurement indicate that Miller cycle and lower charge air temperature reduce 2.8% SFOC and 10% NOx emission. Fuel injection nozzle diameter 0.34㎜ results in 16.6% lower NOx emission than that of previous specification, 0.32㎜, slightly increasing SFOC, 1.3%.