• Title/Summary/Keyword: 화재연기

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A evaluation study of a fire smoke diffusion delay device installed in a great depth underground double deck tunnel (대심도 복층터널에 설치 가능한 화재연기 확산지연장치 성능 평가 연구)

  • Shin, Tae-Gyun;Moon, Jung-Joo;Yang, Yong-Won;Lee, Yun-Taek
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.1
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    • pp.225-234
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    • 2018
  • Domestic urban areas are experiencing serious traffic congestion problems due to continuous population growth and increased traffic volume. In order to solve the problem of traffic congestion, the study of great depth underground double deck tunnels using underground space is being actively carried out in the urban areas. The characteristics of great depth underground double deck tunnels are low in cross section, so the spread of fire smoke is expected to spread faster than the road tunnel in case of fire. Therefore, it is necessary to provide a fire smoke delay device which delays the spread of fire smoke when a fire occurs in a tunnels. In the previous study, the diffusion effect was analyzed according to the blocking area when the fire smoke spread delay device was operated through the 3D CFD in the study of preventing the smoke spread in the case of the tunnel fire. A study on fire smoke diffusion delay device using spring elasticity which is excellent in applicability to a tunnel and economical value is studied. In this study, fire smoke spread delay system was developed to fire smoke delay was experimentally analyzed. Fire smoke delay effect of fire smoke delay device appeared. Therefore, it is considered that the can minimize the damage of the victims when installed in the great depth underground double deck tunnels.

A study on the fire smoke diffusion delay strategy in a great depth underground double deck tunnel junction (대심도 복층터널 교차로 화재연기 확산지연 방안 연구)

  • Shin, Tae-Gyun;Moon, Jung-Joo;Yang, Yong-Won;Lee, Yun-Taek;Han, Jae-Hee
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.1
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    • pp.115-126
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    • 2019
  • Recently, in order to solve the traffic congestion in urban areas and to improve the peripheral environment, research on the design and construction technology development of great depth underground double-deck tunnel is under way by using the underground space in the urban area. The network type double-deck tunnel is in the form of an intersection with a small cross section and a steep slope as per construction at the base of a flatland, so that the fire smoke spreads rapidly in case of fire, which is expected to cause damage of human life. Therefore, this study is analyzed the delay effect of fire smoke diffusion according to the installation and non - installation of delay system for fire smoke diffusion at the intersection. Fire fumes were delayed up to 270 seconds when the delay system for fire smoke diffusion was installed at the intersection and it is analyzed that the greater the operating area of the delay system for fire smoke diffusion, the more preventable the damage of human life of the intersection.

A Study on the Inflow Velocity Reduction Measures in Case of Fire Great Depth Underground Double-Deck Tunnel (대심도 복층터널 화재 시 유입풍속 저감방안 연구)

  • Yang, Yong-Won;Moon, Jung-Joo;Shin, Tae-Gyun
    • Fire Science and Engineering
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    • v.30 no.2
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    • pp.81-86
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    • 2016
  • Recently, frequent traffic congestion has occurred in domestic urban roads. As a solution for downtown traffic congestion in domestic urban roads, plans for great depth underground double-deck tunnels have been made. Great depth underground double-deck tunnels that have been planned for passenger cars, has the structure of a network type; the entry of vehicles is carried out in the underground space. In these network great depth underground double-deck tunnels, the cross section and the height of the tunnel are smaller than the general road tunnel, and the smoke of a fire will propagate faster than the evacuation of tunnel passengers by the action of the traffic-ventilation and casualties are expected. Therefore, in the present study, an attempt was made to prevent the delay system for fire smoke diffusion at the time of a fire in a domestic network great depth underground double-deck tunnel according to the area of the tunnel block during the operation of the delay system for fire smoke diffusion to analyze the effects of reducing the inflow velocity. When the area of the tunnel block was not less than 50%, the effect of reducing about 21% of the wind speed acting on the tunnel was significant. If the area is more than 50%, the diffusion rate of fire smoke was reduced by approximately 21%, which will be useful for a safe evacuation.

Experimental Study on Flow Direction of Fire Smoke in DC Electric Fields (DC 전기장 내에서 발생하는 화재연기 진행 방향에 대한 실험적 연구)

  • Park, Juwon;Kim, Youngmin;Seong, Seung Hun;Park, Sanghwan;Kim, Ji Hwan;Chung, Yongho;Yoon, Sung Hwan
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.5
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    • pp.675-682
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    • 2021
  • Fire accidents on land and at sea can cause serious casualties; specifically, owing to the nature of marine plants and ships, the mortality rate at sea from suffocation in confined spaces is significantly higher than that on land. To prevent such cases of asphyxiation, it is essential to install ventilation fans that can outwardly direct these toxic gases from fires; however, considering the scale of marine fires, the installation of large ventilation fans is not easy owing to the nature of marine structures. Therefore, in this study, we developed a new concept for fire safety technology to control toxic gases generated by fires from applied direct current (DC) electric fields. In the event of a fire, most flames contain large numbers of positive and negative charges from chemi-ionization, which generates an "ionic wind" by Lorentz forces through the applied electric fields. Using these ionic winds, an experimental study was performed to artificially control the fire smoke caused by burning paper and styrofoam, which are commonly used as insulation materials in general buildings and ships. The experiments showed that a fire smoke could be artificially controlled by applying a DC voltage in excess of ±5 kV and that relatively effective control was possible by applying a negative voltage rather than a positive voltage.

A study on the optimal ventilation and smoke exhaust systems in case of fire in subway stations installed with PSD (PSD가 설치된 지하철 역사 내 화재 시 최적 배연시스템 연구)

  • Kim, Hyo-Gyu;Yoo, Ji-Oh;Kim, Doo-Young
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.2
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    • pp.527-539
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    • 2018
  • The subway used by many passengers is required to maintain a safe and comfortable environment and PSD (Platform Screen Door) must be installed in the platform after reinforcing the standard in 2003. In the previous research, in case of subway fire to control it, it is necessary to design the optimal ventilation and smoke exhaust system according to equipment capacity of the smoke exhaust system. Therefore, in this study, based on the results of previous research, three-dimensional numerical analysis was performed for the CO gas and smoke flow by the subway ventilation system in case of platform fire. As a result of this study, it was found that in case of emergency, if only the upper-level smoke exhaust system is activated, the risk of evacuation is high due to CO gas (653.8 ppm) and smoke concentration ($768.4mg/m^3$). And when all the smoke exhaust systems are activated and only the fire side PSD is opened, CO gas (36.0 ppm) and smoke concentration ($26.2mg/m^3$) are detected and the propagation range of smoke flow was reduced. When all the smoke exhaust systems are activated and only the fire side PSD is closed, it was analyzed as the most effective ventilation mode in the evacuation environment due to the absence of smoke-recirculation.

Retraction: A numerical study on the fire smoke behavior by operating the fire prevention system in tunnel-type structure (논문 취소: 터널형 구조물의 방재시설 가동에 따른 화재연기 거동에 관한 수치 해석적 연구)

  • Lee, Ho-Hyung;Choi, Pan-Gyu;Lee, Sang-Don;Heo, Won-Ho;Jo, Jong-Bok
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.1
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    • pp.189-199
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    • 2019
  • In this study, behaviors of fire smoke in the operation of disaster prevention facilities (smoke damper, jet fan) in a tunnel-type structure (soundproof tunnel) were investigated numerically and results of the investigation were compared and analyzed. Through the simulation and analysis, it was found that there was a significant change in the patterns of fire smoke between the opening of the ceiling of a fire vehicle and the closing, and it was shown that the critical temperatures of PC and PMMA, main materials of a soundproof tunnel were not exceeded. In addition, the simulation of installation intervals of smoke dampers showed that the maximum temperature of a soundproof tunnel without smoke dampers was $552^{\circ}C$ while it reached $405^{\circ}C$ when smoke dampers were installed at the installation interval of 50 m. The simulation of the operation of a jet fan showed that the maximum temperature of a soundproof tunnel without a jet fan was $549^{\circ}C$ while it reached only $86^{\circ}C$ when a jet fan was operating. Therefore, it is highly expected that they could create a favorable environment for evacuation and protection of soundproofing materials, and it would be necessary to promote basic studies on tunnels serving various functions and purposes.

Numerical Investigation of Smoke Behavior in Rescue Station for Tunnel Fire (철도터널 화재 시 구난역 내의 연기거동에 대한 수치해석 연구)

  • Hong, Sa-Hoon;Ro, Kyung-Chul;Ryou, Hong-Sun;Lee, Seong-Hyuk
    • Journal of the Korean Society for Railway
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    • v.12 no.1
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    • pp.25-30
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    • 2009
  • The present study deals with numerical investigation for smoke behavior in rescue station by using the commercial CFD code (FLUENT Ver 6.3). With the use of the MVHS(Modify Volumetric Heat Source) model modified from the original VHS(Volumetric Heat Source) model, a 10 MW mode was adopted for simulation and the MVHS model can describe the generation of product and the oxygen consumption at the stoichiometric state. In addition, the present simulation includes the species conservation equations 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.

Full-Scale Test of Smoke-Control Performance of a Subway Tunnel (지하철 본선터널 제연성능 실물 실험)

  • Park, Won-Hee;Lee, Duck-Hee;Jung, Woo-Sung
    • Fire Science and Engineering
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    • v.25 no.4
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    • pp.94-102
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    • 2011
  • Hot smoke test is done in a subway tunnel. Alcohol trays of 1.0 MW and smoke generators are used for generating hot smoke. The fans equipped with the tunnel are successively run 9 min after smoke generation. It is verified how hot smoke is controlled by fans. Velocity and direction of flow, temperature and smoke density are measured and analyzed for smoke control performance of the tunnel with fans and analyzed from the fire-safety-point of view. Velocity of smoke flow is obtained by using measured velocity and temperature at the ceiling of the tunnel. The time when smoke-control flow is builded up is different for the different positions. Velocity distributions at various positions will be used for the boundaries and the comparison data in numerical simulations for evaluation on smoke-control facilities of subway tunnel.

Simulation study of smoke spread prevention using air curtain system in rescue station platform of undersea tunnel (해저터널 구난역 플랫폼 화재연기확산 방지를 위한 에어커튼 시스템 차연성능 시뮬레이션 연구)

  • Park, Sang-Heon;An, Jung-Ju;Han, Sang-Ju;Yoo, Yong-Ho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.257-266
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    • 2015
  • This study introduce that we studied optimization and possibility of smoke spread prevention with air-curtain system in undersea tunnel named from Ho-Nam to Jeju line in domestic if a fire break out in train. To verify performance, air-curtain system is installed between rescue station platform and each door of passenger car to provide safety route to evacuator and we studied simulation model of various cases about 15 MW fire severity considering domestic specifications. As a result we verified the fact that CASE1(air jet with 15degree toward passenger car) and CASE 5 (air jet with 15degree toward passenger car and pressure air blast from cross passage) is best Smoke Spread Prevention and less inflow carbon monoxide. Through above results, we expect that air-curtain system is one of the facilities for fire safety and provide us safety platform route in undersea tunnel.

A Study on the Ventilation Performance for Fan flow effect of Model Tunnel(II) (모형도로터널의 환기성능에 미치는 FAN유량에 관한 연구(II))

  • Kim, Se-Jong;Han, Jung-Chul;Lee, Ju-Hee;Kwon, Young-Jin
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.313-318
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    • 2011
  • 도로터널은 반지하 공간으로서 환기에 많은 설비와 구조에 대한 연구가 진행되고 있으며 특히 제트팬의 경우 평상시에는 환기를 담당하고 있다. 또한 화재시에는 화재연기의 유독가스를 효과적으로 차단하는 제연역할을 함으로서 피난에 대한 중요한 역할을 담당한다. 이러한 제트팬의 특성을 정량적으로 유추하고 공학적인 QRA의 수행을 위한 기초적 연구로서 터널내부의 제트팬의 환기특성을 알아보기 위하여 모형실험체의 내부측정을 2/3까지한 전보에 이어 이번 연구에서는 터널내부전체를 측정하여 제트팬이 모형터널내에 미치는 영향을 CFD와 비교한 연구이다.

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