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디젤 기관 단일 영역 모델 열발생율 계산의 오차 보상에 관한 연구
류승협,김기두,윤욱현,하지수,Ryu Seung-Hyup,Kim Ki-Doo,Yoon Wook-Hyeon,Ha Ji-Soo 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.5
Accurate heat release analysis based on the cylinder pressure trace is important for evaluating combustion process of diesel engines. However, traditional single-zone heat release models (SZM) have significant limitations due mainly to their simplified assumptions of uniform charge and homogeneity while neglecting local temperature distribution inside cylinder during combustion process. In this study, a heat release analysis based on single-zone model has been evaluated by comparison with computational simulation result using Fire-code, which is based on multidimensional model (MDM). The limitations of the single-zone assumption have been estimated, To overcome these limitations, an improved model that includes the effects of spatial non-uniformity has been applied. From this improved single-zone heat release model (Improved-SZM), two effective values of specific heat ratios, denoted by ${\gamma}_V$ and ${\gamma}_H$ in this study, have been introduced. These values are formulated as the function of charge temperature changing rate and overall equivalence ratio. Also, it is applied that each equation of ${\gamma}_V$ and ${\gamma}_H$ has respectively different slopes according to several meaningful periods during combustion progress. The heat release analysis results based on improved single-zone model gives a good agreement with FIRE-code results over the whole range of operating conditions of target engine, Hyundai HiMSEN H21/32.
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.
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.
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.