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최경민(Choi, Gyungmin),이정호(Lee, Jungho),함대헌(Ham, Daeheon),박윤경(Park, Yoonkyung),송양호(Song, Yang Ho) 한국방재학회 2019 한국방재학회논문집 Vol.19 No.7
기후변화로 인한 이상기후 현상은 비단 국내에 국한되지 않고 전 세계적으로 나타나고 있으며 이로 인한 자연재해의 발생빈도와 크기가 증가하고 있다. 국내에서는 집중호우와 해수면 수위의 상승이 가속화 되어 기존의 도심지 내수재해 발생 유형과 맞물려 연안도시 지역에 복합적인 침수피해를 초래하고 있다. 본 연구에서는 XP-SWMM 모형을 이용하여 연안도시 지역의 재해발생 위험성을 고찰하고 해수면 상승에 따른 침수위험을 사전에 대비하기 위한 방재성능목표의 적정성을 검토하였다. 해수면 상승에 따른 침수피해가 발생했던 창원시 일대 우수관망을 대상으로 방재성능목표와 해수면 상승시나리오를 적용하였다. 현재 설정된 방재성능목표에 대한 자연유출 조건에서도 일부 침수에 노출되어 있음을 확인하였으며 해수위 상승에 따른 침수위험도가 증가하는 것을 확인하였다. 본 연구를 통해 제시한 결과들은 연안도시 인근의 해수면 변화에 따른 침수위험도를 시공간적인 변화 양상으로 살펴볼 수 있으며 나아가 관련 치수대책 수립시 참고자료로 활용이 가능하다. The phenomenon and impact of abnormal weather caused by climate change is not limited domestically, and the frequency and magnitude of natural disasters are increasing. In Korea, heavy rainfall has occurred, and sea level rise is accelerating. This falls under domestic urban disasters, which cause severe damage due to multiple floods in the coastal cities. In this study, the risk of disaster in the coastal cities was examined using XP-SWMM. In order to tackle the risk of flooding due to sea level rise, we examined whether the performance targets for the prevention of disasters were appropriate. Performance targets for the prevention of disasters and various scenarios of sea level rise were applied to the urban drainage system in Changwon City, where flood damage had occurred due to sea level rise. In spite of the freefall conditions for the currently set performance targets for the prevention of disasters, it was confirmed that there is a greater risk of flooding due to sea level rise. The results of this study show the spatial variation of flood risk due to sea level change near the coastal cities. Furthermore, these results can be used as reference data for establishing countermeasures to tackle related disasters.
미분탄 이중 스월화염에서 스월강도 및 석탄 입경 변화 영향 연구
최민성(Minsung Choi),성연모(Yonmo Sung),이상민(Sangmin Lee),문철언(Cheoreon Moon),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
The present work focuses on the analysis of the pulverized coal combustion aerodynamics of the dual swirl burner by the control of the swirl-modes such as the outer swirl intensity (OSI). The detailed structure of pulverized coal swirling flames with swirl-mode was studied experimentally by particle image velocimetry and local flame colors based on OH<SUP>*</SUP>, CH<SUP>*</SUP>, and C₂<SUP>*</SUP> radicals. For all co-swirling conditions, the internal recirculation zone (IRZ) was observed near the inner shear layer with respect to the processing vortex core structure. Furthermore, a co-rotating vortex in the outer shear layer and the exhaust tube vortex (ETV) along the central axis were observed. The intensity of CH<SUP>*</SUP> signal was higher with small coal particle size, conversely, the size of the distribution of the CH<SUP>*</SUP> signal becomes larger. Therefore, the control of the aerodynamics with changing swirl intensities may play an important role in improving both environmental and combustion performances.
중공 원추형 연료 분무의 미립화 및 벽 충돌 과정에 대한 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
Numerical analysis about atomization and wall impingement process of hollow-cone fuel spray is performed by a modified KIVA code with hybrid model. The atomization process is modeled by using hybrid breakup model that is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The Gosman model, which is based on the droplet behaviors after impingement determined by experimental correlations, is used for spray-wall impingement process. The LIEF technique was used to compare the results with those of experiment. The calculations and experiments are carried out at the ambient pressures of 0.1 ㎫ and 0.5 ㎫ and the ambient temperature of 293K. It was found that the calculated results show satisfactory agreement with experimental ones.
GDI 엔진용 고압 스월 인젝터의 초기 및 주 분무에 대한 수치적 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The objective of this study is to analyze the pre spray and the main pray ofa high pressure swirl injector for GDI injector by using a hybrid breakup model. The hybrid breakup model is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The LISA model was used for primary breakup process and the APTAB model was used for secondary breakup process. The spray model was incorporated in three-dimensional computational fluid dynamic code (KIVA code). The exciplex fluorescence method was used for comparing the calculated results with the experimental ones. The experiment and the calculation were performed at the ambient pressures of 0.1 ㎫ and 0.5 ㎫ and the ambient temperature of 293K.
GDI 분무의 벽 충돌 과정에 대한 실험 및 수치적 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Experimental and numerical analysis about atomization and wall impingement process of hollow-cone fuel spray is performed by hybrid model and wall impingement model. The atomization process is modeled by using hybrid breakup model that is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The Gosman model, which is based on the droplet behaviors after impingement determined by experimental correlations, is used for spray-wall impingement process. The LIEF technique was used to compare the results with those of experiment. The calculations and experiments are carried out at the ambient pressures of 0.1㎫ and 0.5㎫ and the ambient temperature of 293K.
직접분사식 가솔린엔진에서 피스톤 캐비티 형상이 연료 분무의 충돌과 거동에 미치는 영향
김동욱(Dongwook Kim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was carried out to investigate the effects of piston cavity geometry on the spatial and temporal development of injected fuel sprays in a DI gasoline engine. The impingement and behavior of impinged spray is affected the stratification of fuel mixture. Thus, it is informative to understand in detail the behavior and distribution of fuel mixture after impingement in the cavity. Two dimensional spray fluorescence images of liquid and vapor phase were acquired to analyze the behavior and distribution of fuel mixtures inside cylinder by exciplex fluorescence method. To clarify the wall effect of the piston cavity, cavity wall angle were set to 30, 60 and 90 degrees, respectively. The results show that In the case of 30 degrees, the rolling-up moved from the impinging location to the round and fuel-rich mixture distributed at periphery of cylinder. In the case of 60 and 90 degrees, the rolling-up recircurated and accumulated in the cavity and fuel mixtures concentrated at center region. High concentrated fuel vapor phase was observed in the cavity with 90 degrees. From present study, it was found that the desirable piston geometry affected the fuel mixture stratification in a DI gasoline engine.