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케로신-공기 혼합물의 비정상연소 모델과 탄소성 관의 동적 거동 수치해석
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),여재익(Jai-ick Yoh) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
This paper presents a numerical investigation on kerosene-air mixture detonation and behaviors of thermal elasto-plstic thin metal tube under detonation loading based on multi-material analysis. The detonation loading is modeled by the kerosene-air mixture detonation which is compared with CJ condition and experimental cell size. And the thermal softening effect on elasto-plstic model of metal tube is indicated by different dynamic response of detonation loaded tube in various temperature and tube thickness.
이영헌(Younghun Lee),최상민(Sangmin Choi),양원(Won Yang),조병국(Byungkook Cho) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.44
In the iron ore sinter process, temperature distribution pattern in sintering bed is related with productivity and quality of sintered ore. Evenly heat distribution make the uniform quality of sintered ore but in normal operating condition, upper part of bed has lack of heat and scarce quality of sintered ore, thus yeild rate is decreased and productivity is diminished. Therefore, using the additional fuel in the upper part of bed is considered and effect of fuel is discussed. (max. 80 words)
배가스 재순환 공정에서 산소 농도 및 유속에 따른 소결층 내 연소 반응
이영헌(Younghun Lee),최상민(Sangmin Choi),양원(Won Yang),조병국(Byungkook Cho) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
In the iron ore sintering process, operation conditions control the bed temperature and quality of sintered ore. The operation conditions are inlet gas velocity, composition and temperature and bed composition. Applying the flue gas recirculation in sintering process change the oxygen concentration and velocity of inlet gas. To make the evenly heat concentration in the bed, optimized the suction and injection location and quantity of flue gas. In this study, the influence of flue gas recirculation is analysed by previously developed unsteady 1-dimensional model of an iron ore sintering bed. To evaluate the cases, quantitative parameters are applied to the calculation results, and then evaluation results are used to offer the proper operational conditions.
케로신-공기 혼합물의 비정상연소 모델과 구조체 모델을 통한 수치해석
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),여재익(Jai-ick Yoh) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
본 연구는 케로신 연료를 사용하는 액체로켓엔진에서 발생 할 수 있는 연소불안정으로 인하여 파괴될 수 있는 연소기의 손상을 수치적으로 모사하는 해석 모델의 기초연구이다. 연소 불안정으로부터 야기 될 수 있는 케로신의 데토네이션은 1단계 아레니우스 식의 화학 반응식을 이용하였고, 구조체는 Johnson-Cook 강성모델을 활용하여 데토네이션으로 인한 금속관의 소성 변형을 모델링하였다. 두꺼운 관과 얇은 관의 해석 결과 비교를 통하여 데토네이션 압력에 의한 얇은 관의 소성 변형과 노즐 형상에서 노즐목 부분의 구조체에 가해지는 압력 분포를 확인하고 이로 인해 발생되는 유동장의 변화를 확인하였다. This paper presents a numerical investigation on detonation of a kerosene-air mixture in the elastoplastic metal tubes and the structural responses associated with combustion instability. A single step Arrehnius rate law and Johnson-Cook strength model are used to describe the chemical reaction of kerosene-air mixture and the plastic flow of the elastoplastic metal tube. Also the effects of the tube thickness and nozzle configuration are investigated on the resulting deflagration to detonation transition.
이영헌(Younghun Lee),최상민(Sangmin Choi),양원(Won Yang),조병국(Byungkook Cho) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
In the iron ore sintering process, sintering bed is controled by the operational conditions. And quality and productivity of sintered ore is depend on temperature patterns in the bed. To make the evenly heat concentration in the bed, various operation parameters are required to be considered. Flue gas recirculation process is good for environment but it is influence the lack of productivity of sintered ore. In this study, the influence of flue gas recirculation with adjustment of injection locations and temperature is analysed by previously developed unsteady 1-dimensional model of an iron ore sintering bed. To evaluate the cases, quantitative parameters are applied to the calculation results, and then evaluation results are used to offer the proper operational conditions.
이영헌(Younghun Lee),신현태(Hyuntae Shin),최상민(Sangmin Choi),이장근(Jangkun Lee),나승진(Seungjin Na) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
Computational flow dynamic(CFD) has been frequently applied to the incinerators to understand the flow performance for various design and operating parameters. Thought it needs many simplifications and complicated flow models, the reasonability of its results is not fully evaluated. For example, the inlet condition is calculated from an arbitrarily assumed properties of combustion gas release from the waste bed, since the combustion in the bed is difficult to be predicted. In this study, the computational modeling and calculation procedures of CFD for the grate type incinerator were evaluated using comparative simulations. Combustion model substituted heat flux and heat source models. The heat balance data for incinerator verified the results of simulations. This comparison helps to simplify the combustion model.
유체-고체 연성 해석 기법을 통한 수직발사대 후방 덮개의 거동 해석
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),조해성(Haeseong Cho),주현식(Hyun Shig Joo),신상준(Sang Joon Shin),여재익(Jai-ick Yoh) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
수직 발사대는 발사체에서 나오는 화염에 의하여 구조체의 손상이 일어날 수 있고 특히 후방덮개는 화염에 의하여 직접적으로 변형이 일어나므로 이를 해석하기 위해서는 유체-고체 연성해석 기법을 필요로 한다. 본 연구에서 발사체의 화염은 Eulerian 기법을 이용하여 해석하였고, 발사대의 후방 덮개는 Lagrangian 기법을 사용하여 해석하였다. 서로 다른 두 물질간의 경계면은 레벨을 통하여 추적을 하였고 경계면에서의 경계값은 가상유체 기법을 활용하여 결정하였다. 본 논문에서는 후방 덮개의 변형 형상에 따라 달라지는 유동의 변화를 확인하였다. This paper presents a numerical analysis of behaviors of rear closer of vertical launch system under rocket plume based on fluid structure interaction analysis. The rocket plume loading is modeled by fully Eulerian method and elasto-plastic behavior of rear cover is calculated by total Lagrangian method based on a 9-node planar element. The interface motion and boundary conditions are described by a hybrid particle level-set method within the ghost fluid framework. We compare the fluid flow pattern between different rear closer models which are elast-plastic and rigid deformation.
유체-고체 연성 해석 기법을 통해 유체에 의한 고체의 탄소성 거동 해석 연구
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),조해성(Haeseong Cho),주현식(HyunShig Joo),신상준(SangJoon Shin),여재익(Jai-ick Yoh) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.11
본 연구에서는 발사체를 보관하고 사출하는 수직 발사대에서 발사체의 화염에 의해 변형되는 발사대 후방덮개의 응답을 유체-고체 연성해석 기법을 이용하여 해석하였다. 발사체의 화염은 Eulerian 기법을 이용하여 해석하였고, 탄소성 변형이 일어나는 후방 덮개는 9절점 유한 요소 기법을 사용하여 해석하였다. 유체와 고체 물질간의 경계면 추적은 레벨셋 기법을 사용하였고 경계값은 가상유체 기법을 이용하여 결정하였다. 각 해석 기법들은 이론값들을 통하여 검증되었고, 후방 덮개의 해석 결과는 후방 덮개가 변형되는 시간을 비교하였다. This paper presents numerical investigation on behaviors of the rear cover in the vertical launcher under rocket plume loading by using fluid-structure interaction analysis. The rocket plume loading is modeled by the fully Eulerian method and elasto-plastic behavior of the rear cover is predicted by the total Lagrangian method based on a 9-node planar element. The interface motion and boundary conditions are described by a hybrid particle level-set method within the ghost fluid framework. The present results will be compared with the experimental data in the future.
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),최재준(Jaejun Choi),여재익(Jai-ick Yoh) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
This paper presents a numerical investigation on detonation of a kerosene-air mixture in the elastoplastic metal tubes and the structural responses associated with combustion instability. A single step Arrhenius rate law and Johnson-Cook strength model are used to describe the chemical reaction of kerosene-air mixture and the plastic flow of the elastoplastic metal tube. Also the effect of the tube thickness is investigated on the resulting deflagration to detonation transition.
케로신-공기 혼합물의 데토네이션 모델과 구조체 모델을 통한 금속관의 수치해석
이영헌(Younghun Lee),곽민철(Min-cheol Gwak),여재익(Jai-ick Yoh) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.2
This paper presents a numerical investigation on detonation of a kerosene-air mixture in the copper tube and the structural response associated with combustion instability in liquid rocket engine. A single step Arrehnius rate law and Johnson-Cook strength model are used to describe the chemical reaction of kerosene-air mixture detonation and the plastic deformation of the copper tube. The changes of flow field and tube stress which are induced by plastic deformation, are investigated on the different tube thicknesses and nozzle configurations.