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박형근(Hyoung-Keun Park),갈상학(Sang-Hak Ghal),박현춘(Hyun-Chun Park),이재우(Jae-Woo Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This research was carried out to verify performance of charge air moisturizer system which had been developed to reduce NOx emission from medium speed diesel engines, to comply with US EPA(Environmental Protection Agency) Tier Ⅱ (Category 2) emission regulation. The charge air moisturizer system abates NOx emission from diesel engine through supplying high level of humid charge air which flows into combustion chamber. As the results, NOx and THC(Total Hydro-Carbon) emissions met to the EPA Tier Ⅱ regulations, and PM (Particulate Matter) emission was also below the regulation on conditions of MGO(Marine Gas Oil) and low sulphur fuel oil. But, SFOC(Specific Fuel Oil Consumption) increased slightly. Performance test using this system did not left any trace of rust, corrosion, abnormal wear etc. Thus, it can be concluded that this system has less effect on the durability or reliability of engine components.
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/>
중형 엔진 터보차져의 원심압축기에 관한 공력학적 3차원 형상 및 구동용 연소기 설계
김홍원(Hong-Won Kim),류승협(Seung-Hyup Ryu),갈상학(Sang-Hak Ghal),하지수(Ji-Soo Ha),김승국(Seung-Kuk Kim) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
An aerodynamic design for centrifugal compressor which was applied to medium speed diesel engine has done. First of all, exact compressor specifications must be defined by accurate engine system matching. This matching program has been developed. Using the meanline prediction method, geometric design and performance curve for compressor was done and verified by comparing three dimensional viscous CFD results. The deviation at the design point was about 2.3%. Combustor has been designed and manufactured for the performance test of medium speed diesel engine turbocharger. Fuel nozzle of combustor was designed and performed by PIV and PDPA test equipment. Through these results, spray characteristics were studied and flow coefficient equation was deduced.
선박용 터보차져의 축류터빈의 설계 및 성능평가에 관한 해석적 연구
김홍원(Hong-Won Kim),박종일(Jong-Il Park),류승협(Seung-Hyup Ryu),갈상학(Sang-Hak Ghal) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
As the output of marine diesel engine is enlarged and NOx regulation is tightened by IMO(international maritime organization), engine BMEP(brake mean effective pressure)would be increased to 25 bar and compressed ratios up to 5.0. Therefore, it is required that the development of turbocharger which meets higher efficiency and performance. In this study, specifications of turbocharger and turbine were matched and determined by engine output and three-dimensional turbine geometry was deduced. Design point is as follows. Mass flow rates, revolution, expansion ratio and efficiency was 44㎏/s, 10,296rpm, 3.29 and 84%(total-to-static). For the design of turbine, mean streamline method and pressure loss models were applied and angles, blade number, chord length, height length, thickness of nozzle and blade were determined. Also, optimum blade profiles of sectional plane (0, 25, 50, 75, 100 span%) were developed using polynomial Bezier curves by trial and error method. From designed turbine, off-design performance curve of turbine were drawn as variable engine loads. Designed turbine was verified both three dimensional viscous flow analysis and off design prediction methods at variable loads.
흡기가습 시스템을 이용한 중형엔진의 NOx 저감 기술 연구
박형근(Hyoung-Keun Park),하지수(Ji-Soo Ha),갈상학(Sang-Hak Ghal),박종일(Jong-Il Park),안광헌(Kwang-Hean An) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
디젤엔진에서 배출되는 배기가스 중의 주요 오염물질 중의 하나인 NOx(질소산화물)는 대부분 고온의 연소 과정에서 발생하고, 발생량은 연소온도에 따라 결정되는 것으로 알려져 있다. 또한 연료의 연소 중에 물이 첨가되면 연소공기의 비열 증가에 의하여 연소온도가 감소하여 NOx 발생량이 급격하게 감소하게 되는데, 연소실에 물을 첨가하는 방법으로는 유화연료, 직접물분사, 흡기가습 등이 있다. 이중 흡기가습은 구조가 간단하면서 NOx 저감효율이 가장 높은 것으로 알려져 있다. 본 연구는 당사 고유모델 중형엔진인 힘센엔진에 흡기가습 기술을 적용하여 연소성능 및 NOx 저감효과 등을 시험하고, 흡기가습 시스템의 상용화 모델 개발을 위한 기초 데이터를 확보하기 위해 수행되었다.
힘센엔진 연료분사노즐의 내구성 향상을 위한 설계 개선 연구
박태형(Tae-Hyung Park),김동훈(Dong-Hun Kim),갈상학(Sang-Hak Ghal) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This research was carried out to improve durability of fuel injection nozzle (FIN) of HHI HIMSEN engines. In order to improve combustion efficiency and reduce smoke generation of diesel engines, it is necessary to increase the fuel injection pressure, but it has influence on life span of fuel injection systems. In addition to high oil prices, the spread of using low quality fuel also has a bad effect. Damage on the needle seat of FIN is one of the most significant problems related durability of diesel fuel injection systems. The impact force occurring on the needle seat during the instant of the needle valve closing is the main cause of the corruption. The effect on the impact force of main design parameters of FIN were analyzed through hydraulic analysis and design of experiments (DOE), thereby the optimal design improvement for reducing the impact force were deduced.
김동훈(Dong-Hun Kim),김홍원(Hong-Won Kim),갈상학(Sang-Hak Ghal),하지수(Ji-Soo Ha),김주태(Ju-Tae Kim) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
The simulation of fuel injection system is very useful for the design of new injection systems as well as modifications to existing configurations because of significant reduction of experimental costs and time. The purpose of this study is to improve the accuracy for the simulation results of fuel injection system. 3- Dimensional flow analyses for the fuel injection nozzle, delivery valve, constant pressure valve and spill port were performed and loss coefficients of them were calculated. The Simulation of fuel injection system of the HiMSEN H21/32 engine applying the loss coefficients calculated from the results of 3- Dimensional flow analysis was performed and the simulation results were agreed with the experimental data. Therefore it is concluded that the simulation of fuel injection system using 3-Dimensional flow analysis would be a very useful tool for the design modification or development process of the fuel injection system.