• 제목/요약/키워드: Fire engine

검색결과 216건 처리시간 0.034초

항공기 엔진베이 내 소화장치 성능예측을 위한 연구 (A Study on the Performance Prediction of Fire Extinguish System in Aircraft Engine Bay)

  • 박영하;김형식;김진환;조수용
    • 한국항공우주학회지
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    • 제40권8호
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    • pp.718-725
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    • 2012
  • 항공기 엔진베이에 누유된 연료나 오일이 고온의 엔진 표면에 닿게 되면 점화되어 화재를 야기시킬 위험성이 높다. 이를 방지하기 위하여서는 소화제를 화재방지영역에 신속하게 분사하고 소화제의 농도가 높이 유지되도록 화재방지시스템을 설계하여야 한다. FAA에서는 소화제가 화재방지영역 전체에 6%의 농도를 0.5초 이상 유지하는 것으로 규정하고 있다. 이러한 요구를 만족할 수 있는 화재감지시스템의 개발을 위하여, 본 연구에서는 엔진베이에 소화제의 분사와 농도측정에 대한 수치적인 연구와 실험적인 연구를 수행하였다. 분사된 소화제의 분사시간이나 농도유지에 대하여 실험과 수치적인 연구의 결과는 유사한 경향을 보이나, 실험에서 센서의 응답성으로 인하여 소화제의 농도가 늦게 측정되었다.

밸브 오버랩 기간이 없는 흡기관 분사식 수소기관의 성능 및 역화특성 (Characteristics of Performance and Back-Fire for External Mixture Hydrogen Fueled Engine without Valve Overlap Period)

  • 이광주;강준경;;노기철;이종태
    • 한국수소및신에너지학회논문집
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    • 제18권4호
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    • pp.374-381
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    • 2007
  • In order to verify the feasibility of expansion of back-fire limit equivalence ratio in the hydrogen-fueled engine with external mixture, the characteristics of performance and combustion are experimentally analyzed with change of intake/exhaust valve timings under the fixed valve overlap period of $0^{\circ}$ CA(non-valve overlap period). These characteristics are also tested for the change of exhaust valve closing timing while intake valve opening timing is fixed to clear the main cause of back-fire occurrence. As the results, the less valve overlap period center is retarded, the more back-fire limit equivalence ratio increases and back-fire does not occurred after TDC. In addition, it was shown that the control of back-fire is dependent on intake valve opening timing than valve overlap period.

주행 중 발생한 자동차화재를 엔진정지 주차 후 발견한 화재 사례 분석 연구 (A Study on Case Analysis of Motor Vehicle Fires Which Occurred in Operation but Were Found after Parking)

  • 이의평
    • 한국자동차공학회논문집
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    • 제20권6호
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    • pp.9-16
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    • 2012
  • It is often thought that when a fire is found in parked motor vehicles, the fire may occur after an engine stops. Also, it is easy to judge that when motor vehicle fires occur during engine stopping, it may be caused by arson or electrical causes irrespective of a fuel system. This study analyzed motor vehicle fires which occurred in operation but were found after parking and revealed that these fires were caused by the defect of a fuel system and the same motor vehicle types had fires by the same causes. Moreover, this study provided judgement process of major fire causes and periods for fire investigators to apply when investigating fires of parked motor vehicles. And this fire is related to automotive products liability.

시동불능 자동차에서 발생한 화재의 원인 분석 연구 (A Study on Cause Analysis of a Fire that Broke Out on a No-start Motor Vehicle)

  • 이의평
    • 한국자동차공학회논문집
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    • 제20권6호
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    • pp.92-99
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    • 2012
  • It is often thought that because no-start motor vehicles cannot start an engine, a fire cannot occur for motor vehicle causes. However, although the engine cannot start up, some parts may be live with electricity if a battery is connected. If the parts have problems, a fire can occur. This study analyzed the causes of fires occurring when a motor vehicle was loaded onto a tow truck to service no-start. It is suggested that no-start motor vehicles should separate a battery terminal to prevent a fire. And this fire is related to automotive products liability.

THE DEVELOPMENT OF THE EM-$200^{TM}$ GAS-FILLED AFFF FIRE EXTINGUISHER FOR AUTOMATIC FIRE SUPPRESS10N SYSTEMS IN THE ENGINE COMPARTMENT OF AUTOMOBILES

  • Jung, Ki-Chang;Kim, Hong;Kang, Young-Goo
    • 한국화재소방학회:학술대회논문집
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    • 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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    • pp.598-605
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    • 1997
  • In recent years, the number of vehicle fires, as well as the number of motor vehicles, has been increasing rapidly. Therefore, several types of automatic fire suppression systems for the engine compartment of automobiles have been developed to extinguish automobile fires, and most of these systems use halon 1301 as a fire extinguishing agent. Due to environmental concerns, the phase-out of halons has been announced, so now there is a need to replace halon 1301. For this, a 1,1,1,2,3,3,3-heptaflouropropane (HFC-227ea, FM-$200^{TM}$) gas-filled Aqueous Film- Forming foam (known as AFFF) extinguisher was devised even though air foam extinguishers could be used. This is because the air in the foam bubbles is a source of oxygen required for the combustion reaction. It can be surmised that it is possible to increase the fire extinguishing efficiency of AFFF by filling in foam bubbles with a gaseous extinguishing agent. The best choice is the FM-$200^{TM}$ gas-filled AFFF, Which has the maximum expansion ratio of 62:1. This makes it possible for the expanded foam to rapidly fill the engine compartment.

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선박 엔진룸의 소화용 분무노즐의 재료특성 및 유동해석 (Finite Element Analysis and Material Characteristics of Fire Spray Nozzle for Ship Engine Room)

  • 배동수;이진경
    • 한국산업융합학회 논문집
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    • 제22권5호
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    • pp.553-559
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    • 2019
  • Various types of nozzles have been used to cope with fire in ships. However, in Korea, precise nozzles that perform fine spraying function are required for fire fighting in case of fire in a ship, and most of these nozzles depend on imports. Therefore, in this study, we developed various types of nozzles to develop the water spray nozzle for evolving fire in the engine room of the ship, and developed an optimal nozzle through flow analysis and fire test. For this purpose, we selected the materials that can satisfy the characteristics of existing nozzle materials and developed the design technology and processing technology in the nozzle considering fluid flow to achieve optimal water spraying performance. In order to develop an optimal nozzle, the flow through the finite element analysis was first analyzed and the nozzle was manufactured. As a result of flow analysis of the developed nozzle, the maximum velocity at the outlets of four holes at 0.3 MPa was about 3m/s and about 0.15 MPa. In addition, when the pressure at the inlet was 1.8 MPa, it showed the outlet speed of about 18m/s and a pressure of 1.2 MPa.

소방차 펌프의 방수성능 기준 재정립을 위한 실증적 연구 (An Empirical Study on the Standard Re-establishment of Water Discharge Performance for the Fire Engine Pump)

  • 민세홍;권용준
    • 한국화재소방학회논문지
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    • 제26권5호
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    • pp.85-91
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    • 2012
  • 소방차에 설치되는 소방펌프에 대한 방수성능 기준이 현장에서 운용하고 있는 실태와 상이한 부분이 있고, 기준이 명확하게 규정되어 있지 않아 소방공무원이 화재현장에서 소방펌프의 사용시간, 최대사용압력, 사용 호스 직경 등 사용 실태를 분석하고, 그 결과를 토대로 소방펌프에 대한 압력별, 호스 직경별 수량별로 다양하게 성능시험을 실시하였다. 현장조사 결과, 소방자동차용 소방펌프의 성능에 관한 인정기준에서 규정하고 있는 규격방수압력(0.85MPa)과 고압방수압력(1.4 MPa)보다 현장에서는 더 높은 압력을 사용하고 있는 것으로 조사되었다. 또한, 펌프의 성능시험 결과는 방수량 및 방수압력 등이 호스의 직경, 관창에 따라 현재 규정하고 있는 인정기준과 매우 상이하게 측정되었으며, 본 연구 결과로 새로운 규격을 제안한다.

선박용 미분무수 소화설비의 성능평가연구 (A Study on the performance test of Water mist system as a fire extinguish system for Ships)

  • 김성윤;안병호;김동석;김유택
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2006년도 전기학술대회논문집
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    • pp.155-156
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    • 2006
  • Developed and conducted a performance test of the Water mist system that is satisfied with the requirement of a fire test requiring Class 3 Engine Mock-up exceeding net volume $3,000m^3$ as per IMO's MSC/Circ. 668 Appendix B(Test method for fire testing equivalent water-based fire-extinguishing systems for machinery spaces of category A and cargo pump rooms).Even though fuel atomizing was continued for 15 sec. after stopping of the system according to the test method relating to the atomizing fire type, no fire was reignited. This result shows the excellence of the system. There was no damage to the contents of the system after the test.

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