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터널 화재시 배연속도가 연소율변화에 미치는 실험적 연구 - Heptane 풀화재 경우
유홍선,양승신,Ryou, Hong-Sun,Yang, Seung-Shin 한국터널지하공간학회 2005 터널기술 Vol.7 No.2
본 연구는 터널내 화재시 배연속도가 연소율 변화에 미치는 영향을 파악하기 위하여 Froude scaling에 의해 1/20 크기로 축소한 모형화재 실험을 수행하였다. 화원으로는 4.5cm~8.5cm의 헵탄을 사용하였으며 발열량은 3.71~15.6 kW이다. 연소율은 로드셀을 이용하여 산출하였고, 연기거동을 파악하기 위하여 K형 열전대를 이용하여 온도분포를 측정하였다. 풍동은 터널 상류 한쪽부분과 연결하였고, 터널 공간의 배연속도를 제어하기 위하여 풍동의 인버터를 조정하였다. 헵탄 풀화재인 경우 배연속도가 증가할수록 충분한 산소의 공급으로 연소율은 증가하였으며, 같은 무차원 속도($\bar{V}$) 일때 화원 크기가 작아짐에 따라 연소율은 증가하였다. In this study, the 1/20 reduced-scale experiments using Froude scaling were conducted to investigate the ventilation velocity of the variation of burning rate in tunnel fires. The heptane square pool fire with heat release rate ranging from 3.71~15.6 kW were used. The burning rate of fuel was obtained by measuring mass using load cell and temperature distributions were measured by K-type theomocouples in order to investigate smoke movement. The ventilation velocity in the tested tunnel was controlled by inverter of the wind tunnel. In heptane pool fire case, the increase in ventilation velocity incresed the burning rate due to the direct supply of oxygen to the fire plume. For the same dimensionless velocity($\bar{V}$), burning rate increased as the size of pool fire decreased.
유홍선(Hong-Sun Ryou),노경철(Kyoung Chul Ro),강관구(Kwan Gu Kang),허남건(Nahmkeon Hur) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
NUFLEX is a general purpose program for the analysis 3D thermo/fluid flow and pre/post processor in a complex geometry. NUFLEX is composed various physical models, such as phase change(solidijlcatian/melting) and spray, MHD(Magneto Hydraulic Dynamics) models. It is possible to simulate of continuous cast iron process and spray droplet breakup/collision phenomenon. For the verification of these models, compared with the experimental data and commercial CFD code's results. The results show good agreements with experimental and comercial CFD codes's results.
철도터널 화재 시 구난역 내의 연기거동에 대한 수치해석 연구
홍사훈(Hong Sa Hoon),유홍선(Ryou Hong Sun),이성혁(Lee Seong Hyuk) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The present study performed numerical investigation to analyze the smoke behavior in the rescue station by using the commercial CFD code (FLUENT Ver 6.3). The present study adopted a 10MW ultrafast mode for simulation, and it also used the MVHS(Modify Volumetric Heat Source) model modified from the original VHS(Volumetric Heat Source) model in order to treat the product generation and the oxygen consumption under the stoichiometric state. In addition, the present simulation includes the species conservation equation for the materialization of heat source and the estimation of smoke movement. From the results, the smoke flows are moving along the ceiling because of thermal buoyancy force and as time goes, the smoke gradually moves downward at the vicinity of the entrance. Moreover, without using ventilation, it is found that the smoke flows no longer spread across the cross-passages because the pressure in the non-accident tunnel is higher than that in the accident tunnel.
FDS_EVAC에 적용된 독성가스모델(FED)이 피난에 미치는 영향 분석 및 개선에 대한 연구
김홍진 ( Hong Jin Kim ),배승용 ( Sung Yong Bae ),최영기 ( Young Ki Choi ),홍기배 ( Ki Bae Hong ),유홍선 ( Hong Sun Ryou ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.1
When fire occurs in complex or building, toxic gas is important factor for evacuation because it cause death of evacuees. The effect of toxic gas which effects human motion is calculated using Purser`s Fractional Effective Dose (FED). The FDS_EVAC is used for evacuation. However, FED of FDS_EVAC has some problem of application because it dose not considers evacuees`s gender and age groups but using single subject. In this study, numerical analysis using modified FED which considers gender and age group of evacuees was performed. We investigate the effect of improved FED on the evacuation. We applied evacuation analysis to exhibition centre where the evacuees was set one thousand five hundred people. The FED is increasing with children 2%, male 17%, female 4%, adult 13% and elderly people 22%. Fatality is increasing due to increased FED.
[동력전달계부문] 로업클러치 체결시 페이싱 부근의 온도 측정 및 수치해석
고권현(Hong Sun Ryou),유홍선(Gwon Hyun Ko),조성욱(Seong Wook Cho),이규봉(Gyu Bong Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
The present article deals with the estimation and the numerical calculations for the temperature distribution near the facing of the rockup clutch, The rotating telemetry system is introduced for the estimation inside high-speed torque converter. For the numerical calculation the effect of the convective heat transfer is considered as well as the conduction to the solid, The estimation shows that the oil temperature near facing rapidly rises as the rockup clutch is connected, The numerical results shows good agreements with the experimental values for the maximum temperature near the facing of the rockup clutch.
수치해석 기법을 이용한 호흡 유량에 따른 사람의 기도 내 유동 특성 연구
성건혁,유홍선,Sung, Kun Hyuk,Ryou, Hong Sun 대한의용생체공학회 2012 의공학회지 Vol.33 No.4
The inspiratory flow rate of a human is changed with the amount of the workload. The flow characteristic is affected by the inspiratory flow rate. In the flow field of airway, the both of turbulence intensity and secondary flow affect the deposition pattern of particles which is important for the drug-aerosol targeting. Thus the analysis of the flow characteristic in a human airway is important. The purpose of this study is to investigate the effects of the inspiratory flow rate on the flow characteristics in a human airway. The tubular airway is consistent with the oral cavity, pharynx, larynx and trachea. The relatively inspiratory flow rate is used at each case of human states regarding the workload. By the effect of geometric airway changes, transition to turbulent airflow after the larynx can occur with relaminarization further downstream. The low Reynolds number k-${\omega}$ turbulence model is used for analysis with flow regime. As the inspiratory flow rate is larger, the turbulence kinetic energy and secondary flow intensity increase in airway. On the other hand, the area of recirculation zone is smaller.
이인섭,유홍선,김원배,양제복,Lee, In-Sub,Ryou, Hong-Sun,Kim, Won-Bae,Yang, Je-Bok 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7
The main objective of the present study is to analyze the heat transfer characteristics in the vacuum carburizing furnace. Local temperatures are measured at different locations in the self-fabricated furnace for various operating conditions using K-type thermocouples. In addition, the present study simulates the fluid flows and heat transfer in the vacuum carburizing furnace using a commercial package (Fluent V. 6.0), and compares the predictions of local temperatures with experimental data. The temperature and flow fields are predicted. It is found that the time taken for reaching the steady-state temperature under the vacuum pressure is shorter than that under the normal pressure condition. It means that the carburizing furnace under vacuum pressure condition is capable of saving the required energy more efficiently than the furnace under the normal pressure condition. Furthermore, the temperature variations predicted by the numerical simulations are in good agreement with experimental data.
이성혁,유홍선,Lee, Seong-Hyuk,Ryou, Hong-Sun 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
The main purpose of this article is to propose and assess a new spray impingement model considering film formation, which is capable of describing the droplet distribution and film flows in direct injection diesel engines. The spray-wall interaction model includes several mathematical formulae, newly made by the energy conservation law and some experimental results. The model consists of three representative regimes, rebound, deposition and splash. In addition, the film flow is described in the present model by solving the continuity and momentum equations for film flows using the integral method. To assess the new spray impingement model, the calculated results using the new model are compared with several experimental data for the normally impinging diesel sprays. The film model is also validated through comparing film radius and thickness against experimental data. The results show that the new model is generally in better agreement with experimental data and acceptable for prediction of the film radius and thickness.