• Title/Summary/Keyword: Exhaust facility

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Investigation of Exhaust Facility of Liquid Rocket Propulsion System (액체로켓 추진기관의 후류처리장치 고찰)

  • Cho, Nam-Kyung;Lee, Kwang-Jin;Han, Young-Min
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.133-138
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    • 2012
  • Exhaust facility has basically the role of flame deflector, and considering additional functions, it can be classified by noise/emission suppressor and altitude simulation facility. In this paper, principles of flame deflector, jet pump, emission suppression are presented for exhaust treatment facility. Principles of noise suppression caused by Mach wave mitigation, jet energy mitigation by water evaporation and condensation are shown. In addition, a concept of vertical exhaust treatment facility is presented applying basic principles aforementioned.

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Analysis of Air Quality and the Management Plan for Exposure to Hazardous Substances in the Garage of a Fire Station (소방청사 차고지 공기질 분석 및 유해물질 노출 관리 방안)

  • Park, Je-Seop;Han, Dong-Hun
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.30 no.4
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    • pp.394-404
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    • 2020
  • Objectives: The aims of this study are to derive the characteristics of diesel exhaust gas emissions generated during vehicle checking in the garage of fire stations and of the related improvement plans for proper air quality management. Methods: The researcher measured changes in the air quality inside garages according to the operating conditions of the exhaust facility and before and after vehicle checking at three fire stations. Results: During the checking of fire engines, a large volume of hazardous substances exceeding management standards were generated, and improvement of the discharge facilities was required for proper air quality management. Conclusions: It is necessary to study the hazard evaluation of firefighters' exposure to exhaust gas, to operate exhaust gas ventilation facilities, and to prepare technical standards for proper indoor air quality management.

A Study of Smoke Exhaust Facility Operation of Subway Platform with Installation of Platform Screen Door (승강장 스크린도어 설치에 따른 배연설비운영에 대한 연구)

  • Rie, Dong-Ho;Ko, Jae-Woong;Kim, Ha-Young
    • Journal of the Korean Society of Safety
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    • v.21 no.1
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    • pp.35-40
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    • 2006
  • A study on fire phenomena in a subway transit mass station has been carried out as a part of disaster prevention plan at the subway station. The ventilation facilities installed in both the platform and the trackway are designed to convert into a smoke exhaust system in emergency situation, creating such an environment as necessary for evacuation. 3 dimensional Numerical Simulations based on the CFD are carried out using a simulation tool, Fire Dynamic Simulator. Additionally, four different vent modes are made and performances are compared with the original design mode and each other to find better operation of vents at both the platform and the trackway in case of fire. From the result, an vent operational characteristics under the condition of installed PSD is clarified for the effective smoke and heat removal from the platform area compared with non installed PSD.

A Study of Heat St Smoke Evacuation Characteristics by the Changing of Operational Method of Tunnel Fan Shaft Ventilation System for Fire on Subway Train Vehicle (지하철 화재시 본선터널 환기시스템에 따른 열 및 연기배출특성)

  • 이동호;유지오
    • Fire Science and Engineering
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    • v.17 no.2
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    • pp.62-69
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    • 2003
  • The smoke control system in subway platform is not only using for smoke exhaust facility but also using ventilation system. For this reason, smoke vent effectiveness is depending on its position, ventilating volume capacity and the vent method. In this study, the passenger's evacuation time was calculated for the case of fire on sloped subway train vehicle in subway platform. In order to recommend the mechanical smoke exhaust operation mode, SES (Subway Environmental Simulation) was used to predict the airflow of the inlet and outlet tunnel for the subway station. Fire dynamics Simulator(FDS) was used the SES's velocity boundary conditions to calculate the smoke density and temperature under the condition of fire on stopped subway train vehicle at the platform. We compared smoke density and temperature distributions for each 6 types of smoke exhaust systems to clarify the characteristics of smoke and hot air exhaust effectiveness from the result of fire simulation.

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.