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Effect of Pressure and External Heating on Microgravity and Earth Gravity Fires
Effect of Pressure and External Heating on Microgravity and Earth Gravity Fires
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104846
- ISBN
- 9798293892662
- DDC
- 621
- 서명/저자
- Effect of Pressure and External Heating on Microgravity and Earth Gravity Fires
- 발행사항
- [Sl] : University of California, Berkeley, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 96 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Gollner, Michael;Fernandez-Pello, Carlos.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2025.
- 초록/해제
- 요약While fire behavior on Earth has been studied for centuries, fire research in microgravity conditions is still in its infancy. The frequency of human space travel and length of individual missions have resulted in a greater need to understand microgravity fire safety. There is particular concern about reducing the flammability risk inside a spacecraft, as the consequences of a fire could be catastrophic in an enclosed environment where egress is difficult or impossible.The flammability of a material is greatly influenced by the environmental conditions that surround it. Spacecraft environments generally feature reduced ambient pressures, low velocity flows, and potentially elevated oxygen concentrations, and understanding how these conditions affect combustion is an important aspect of flammability assessments. This work aims to compare the flame spread and limiting oxygen concentration (LOC) for opposed flame spread extinction of polymethyl methacrylate (PMMA) in sub-atmospheric microgravity and earth-gravity environments under the influence of an external radiant heat flux, using ground and ISS experiments. The radiant heating ranges from 0 to 3.3 kW/m2 and the subatmospheric pressures tested are as low as 40 kPa. Special attention is paid to the influence of a diminishing oxygen concentration on the flame spread rate and process of flame extinction. Experiments show that the ambient pressure and external heat flux have parallel effects on the rate of flame spread over a solid combustible. Reducing the pressure reduces the flame spread rate and increases the LOC. At the same time, reducing the external radiant flux also reduces the flame spread rate and increases the LOC. It appears that an increased external radiant flux influences flame spread more strongly, and it counteracts the deterring effect of reducing the ambient pressure. The LOC in microgravity is far lower compared to normal gravity, emphasizing the gravity of this research.
- 일반주제명
- Mechanical engineering
- 일반주제명
- Engineering
- 일반주제명
- Thermodynamics
- 일반주제명
- Aerospace engineering
- 키워드
- Fire safety
- 키워드
- Flammability
- 키워드
- Microgravity
- 기타저자
- University of California, Berkeley Mechanical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798293892662
■035 ▼a(MiAaPQ)AAI32173758
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aLiveretou, Christina.
■24510▼aEffect of Pressure and External Heating on Microgravity and Earth Gravity Fires
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a96 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Gollner, Michael;Fernandez-Pello, Carlos.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2025.
■520 ▼aWhile fire behavior on Earth has been studied for centuries, fire research in microgravity conditions is still in its infancy. The frequency of human space travel and length of individual missions have resulted in a greater need to understand microgravity fire safety. There is particular concern about reducing the flammability risk inside a spacecraft, as the consequences of a fire could be catastrophic in an enclosed environment where egress is difficult or impossible.The flammability of a material is greatly influenced by the environmental conditions that surround it. Spacecraft environments generally feature reduced ambient pressures, low velocity flows, and potentially elevated oxygen concentrations, and understanding how these conditions affect combustion is an important aspect of flammability assessments. This work aims to compare the flame spread and limiting oxygen concentration (LOC) for opposed flame spread extinction of polymethyl methacrylate (PMMA) in sub-atmospheric microgravity and earth-gravity environments under the influence of an external radiant heat flux, using ground and ISS experiments. The radiant heating ranges from 0 to 3.3 kW/m2 and the subatmospheric pressures tested are as low as 40 kPa. Special attention is paid to the influence of a diminishing oxygen concentration on the flame spread rate and process of flame extinction. Experiments show that the ambient pressure and external heat flux have parallel effects on the rate of flame spread over a solid combustible. Reducing the pressure reduces the flame spread rate and increases the LOC. At the same time, reducing the external radiant flux also reduces the flame spread rate and increases the LOC. It appears that an increased external radiant flux influences flame spread more strongly, and it counteracts the deterring effect of reducing the ambient pressure. The LOC in microgravity is far lower compared to normal gravity, emphasizing the gravity of this research.
■590 ▼aSchool code: 0028.
■650 4▼aMechanical engineering
■650 4▼aEngineering
■650 4▼aThermodynamics
■650 4▼aAerospace engineering
■653 ▼aFire safety
■653 ▼aFlammability
■653 ▼aLimiting oxygen concentration
■653 ▼aMicrogravity
■690 ▼a0548
■690 ▼a0537
■690 ▼a0348
■690 ▼a0538
■71020▼aUniversity of California, Berkeley▼bMechanical Engineering.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359183▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
