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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.
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.
유다해(Da Hae Yu),최경민(GyungMin Choi),이정호(Jungho Lee),이정민(Jung Min Lee) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.6
도심지 우수관망의 해석에 사용되는 SWMM (Storm Water Management Model)은 유역 유출과 관거 내 수리적 해석 및 역류 현상 등에 대한 정밀한 해석이 가능한 반면, 매개변수의 추출, 관망의 구성 및 해석상의 운용 등에 있어서 전문적인 지식이 필요하며 일반 설계사에서의 접근성이 다소 어렵다. 이에 본 연구에서는 우수관망에 대한 개략 설계 및 타당성 검토 측면에서 보다 편리하게 사용할 수 있는 격자기반 간략해석 모델을 개발하였다. 본 모형은 격자단위에서 지표유출의 분석과 우수관로 해석 및 우수저류조의 연계 구성이 가능하며, 기본 유출해석 및 관로 흐름과 저류 해석에 간략식들을 이용하였다. 또한 본 모형은 기존 우수관로와 연계될 수 있는 우수저류조 및 다양한 침투시설(LID시설)에 대해서는 격자단위에서의 규모 산정을 통해 개략적인 효과 검토가 가능한 특징을 가지고 있다. 개발된 모형은 부산시 광안리 해안 일대 우수관망에 적용하여 EPA-SWMM의 결과와 비교하였으며, 검토 결과 지표유출 및 관로 내 유출 측면에서는 유사한 결과를 나타내었으나 저류 및 월류량은 다소 차이를 나타내었다. 다만 월류 발생 지점들 및 발생 경향에 있어서 유사한 결과를 나타내었으며, 이에 따라 본 모형의 목적상 개략적인 분석 결과와 다양한 설계안들에 대한 간편한 타당성 검토에 유용할 것으로 기대된다. The Storm Water Management Model (SWWM), used for the analysis of storm sewer networks in urban areas, enables precise analysis of watershed runoff, hydraulic analysis and backwater effect in conduits, and so forth. However, it requires the specialized knowledge in parameter extraction, sewer network configuration, and analytical operation, it is somewhat difficult to access at the general engineering companies. Therefore, this study developed a grid-based simplified analysis model that is more convenient in terms of schematic design and feasibility review of storm sewer networks. This model can be used to analyze surface runoff, storm sewer network, and stormwater storage connection configuration at the grid unit, and it uses simplified formulas for basic runoff analysis and storm sewer network flow and storage analysis. In addition, this model can review the rough effects of stormwater storage and various infiltration facilities that can be linked to existing storm sewer network through size calculation of grid units. The developed model was applied to the storm sewer network in the coastal area of Gwangalli, Busan, and our results were compared with the results of the Environmental Protection Agency's (EPA) SWMM. Similar results were obtained in terms of surface runoff and runoff within the storm sewer network, but there were some differences in the amount of storage and overflow. However, results were similar in the occurrence nodes and trends of overflow, and accordingly, it is expected to be useful for the purpose of this model and for simple feasibility studies of various design proposals and rough analysis results.
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.