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방재설비 운영을 고려한 대심도 지하역사의 화재안전성 평가
김영매(Yingmei Jin),홍석우(Seokwoo Hong),권혁빈(Hyeokbin Kwon) 한국도시철도학회 2019 한국도시철도학회논문집 Vol.7 No.1
본 연구에서는 대심도 지하역사의 전동차 화재 및 정거장 화재 시 제연설비와 스크린도어의 운영여부 등에 따른 다양한 시나리오에 대하여 전산유체역학을 이용한 유동장 시뮬레이션을 통해 시나리오 별 허용안전피난시간을 계산하였으며, 이에 미치는 인자의 영향을 정량적으로 분석하였다. 화원 크기, 화원 위치, 제연설비와 스크린도어의 운영 상태를 고려한 12개 시나리오 대해 전산유체해석의 3차원 비정상 비압축성 Navier-Stokes 방정식을 이용하여 시나리오 별 화재 시뮬레이션을 수행하였으며, 허용안전피난시간을 계산하기 위하여 온도, CO 농도, 매연 농도에 따른 인명피해 기준을 고려하였다. 허용안전피난시간을 통한 화재안전성 분석 결과, 전동차 화재인 경우 모든 시나리오에서 법적 안전기준을 만족하는 것으로 나타났으며, 정거장 화재인 경우는 제연설비와 스크린도어가 모두 성공적으로 운영되었을 때의 시나리오만 안전기준을 만족하는 것으로 나타났다. In this study, ASET for each scenario was calculated by CFD simulations for various scenarios according to the ventilation facilities and operation of PSD in the case of train-fired and platform-fired. And the influence of the factors on fire safety was quantitatively analyzed. 12 scenarios have been considered to the fire scales, locations, and the operation of the ventilation system and PSD. Simulations were performed to use 3D unsteady incompressible Navier-Stokes equations. In order to calculate the ASET, the life damage criterion according to temperature, CO concentration, and soot concentration was considered. The results of the ASET fire safety analysis show that all of the train-fire scenarios meet the legal safety standards. In the platform-fire scenarios, only the scenario in which the ventilation system and PSD were operated successfully satisfied the safety standards.
권혁빈,JIN YINGMEI,이웅현,강형민 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.3
An air compressor has been adapted to a high-speed train to reduce the aerodynamic problems when passing through a tunnel. To evaluate the feasibility of the air compressor to attenuate the aerodynamic drag, pressure transient and the micro-pressure wave, the flow around the high-speed train has been simulated using the unsteady axisymmetric compressible Navier–Stokes equation. The simulation results by the dedicated CFD program for the train-tunnel aerodynamics named C-STA™ showed good agreements with the field test result of Korea Train eXpress train running through the Bok-An tunnel. By adapting a compressor with 20% of the train cross-sectional area, the simulation results showed 9% reduced average aerodynamic drag, 54% reduced peak pressure rise in tunnel, and 20% reduced micro-pressure wave, which prove that adapting a compressor can be a good measure to attenuate the tunnel aerodynamic problems for high-speed train.
강형민,JIN YINGMEI,권혁빈,김규홍 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.4
The characteristics of aerodynamic drag for Transonic Vehicle in Evacuated Tube was investigated using computational fluid dynamics. At first, parametric study on the system was performed according to the Mach number of the vehicle’s speed (Machv), evacuated pressure of the tube (Pret), and blockage ratio (BR) between the vehicle and tube via axisymmetric flow analysis; the Machv ranged from 0.3 to 1.0. The Pret was 100, 1,000 and 10,000 Pa and the BR was 0.1, 0.2, and 0.4. In the calculations, the aerodynamic drag of the vehicle was larger when the BR and the pressure became larger. Concerning the Machv, the drag coefficient (Cd) became the maximum when the Machv was near the Kantrowitz limit and decreased, which showed the typical transonic flow pattern. Then, three dimensional flow analysis was performed by changing the Machv from 0.3 to 1.0 and setting the BR and the Pret as 0.34 and 100 Pa, respectively by referring the Hyperloop Alpha documentation. From the calculations, the Cd from three dimensional flow simulations were somewhat larger than those of axisymmetric ones because of the eccentricity of the vehicle inside the tube. However, the pattern of Cd according to the Machv was compatible with that of axisymmetric ones.
Hyungmin Kang,Yingmei Jin,Hyeokbin Kwon,Kyuhong Kim 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.4
The characteristics of aerodynamic drag for Transonic Vehicle in Evacuated Tube was investigated using computational fluid dynamics. At first, parametric study on the system was performed according to the Mach number of the vehicle’s speed (Machv), evacuated pressure of the tube (Pret), and blockage ratio (BR) between the vehicle and tube via axisymmetric flow analysis; the Machv ranged from 0.3 to 1.0. The Pret was 100, 1,000 and 10,000 Pa and the BR was 0.1, 0.2, and 0.4. In the calculations, the aerodynamic drag of the vehicle was larger when the BR and the pressure became larger. Concerning the Machv, the drag coefficient (Cd) became the maximum when the Machv was near the Kantrowitz limit and decreased, which showed the typical transonic flow pattern. Then, three dimensional flow analysis was performed by changing the Machv from 0.3 to 1.0 and setting the BR and the Pret as 0.34 and 100 Pa, respectively by referring the Hyperloop Alpha documentation. From the calculations, the Cd from three dimensional flow simulations were somewhat larger than those of axisymmetric ones because of the eccentricity of the vehicle inside the tube. However, the pattern of Cd according to the Machv was compatible with that of axisymmetric ones.
중국 제조업 부문별 CO<sub>2</sub> 잠재감축량 및 한계저감비용 지역 간 비교 분석
김영미,이명헌,Jin, Yingmei,Lee, Myunghun 한국자원경제학회 2013 자원·환경경제연구 Vol.22 No.3
본 논문에서는 중국 정부가 추진하고 있는 '저탄소 지속가능한 성장'의 실현가능성을 개진하는 데 있어서 탄소배출권 거래 시범지역으로 지정된 7개 지역 가운데 북경시, 중경시 제조업 24개 부문을 대상으로 각 지역별로 투입물거리함수를 추정하여 기술효율성, $CO_2$ 암묵가격, 투입요소 간 간접 모리시마 대체탄력성 등을 측정하여 이를 토대로 업종 간, 지역 간 최대 $CO_2$ 잠재감축량, 탄소배출권 거래의 비용절감효과, 자본 투자로 인한 $CO_2$ 감축의 잠재적 성과 등을 비교, 분석하였다. 2010년 현재 북경시, 중경시 제조업은 100% 기술효율성 달성을 통하여 $CO_2$ 배출량을 각각 최대 516만 톤, 1,704만 톤까지 감축가능한 것으로 추산되었다. 평균적으로 탄소배출권 거래의 한계저감비용 절감효과는 중경시에서, 자본 투자의 $CO_2$ 감축효과 가능성은 북경시에서 더 높게 나타났다. To assess the feasibility of 'low carbon, sustainable growth' policy pursued of the Chinese government, this paper first measures technical efficiency, $CO_2$ shadow prices, and indirect Morishima elasticity of substitution between capital and energy for 24 of manufacturing sectors in Beijing and Chongqing, in which China launched pilot carbon emissions trading scheme, by estimating the input distance function. Based on these results, then the potential for $CO_2$ reduction, cost savings from emissions trading, and the effectiveness of capital investment in reducing $CO_2$ are compared across industries and provinces. In 2010, manufacturing industries in Beijing and Chongqing could potentially reduce the largest $CO_2$ emissions, amounting 5.2 and 17 million tons, respectively, by achieving 100% technical efficiency. While, on average, Chongqing has a comparative advantage in the cost savings from carbon trading over Beijing, Beijing is more likely to reduce $CO_2$ by expanding capital investment.