지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 박설현
- 발행연도
- 2017
- 저작권
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이 논문의 연구 히스토리 (5)
2017
2015
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In the present study, the ignition characteristics of liquid fuel and flame spread on solid fuel were experimentally investigated under atmospheric conditions similar to those inside the first stage of launch vehicles. To quantify ignitability as ignition characteristics, the minimum ignition energy (MIE) for liquid fuel was defined and measured under elevated oxygen concentrations and reduced atmospheric pressures which are the most probable conditions during the space launch vehicle’s operating process. The experimental results demonstrate that the measured MIE decreased with increasing the oxygen concentration for given atmospheric pressures. When the atmospheric pressure was reduced from 1 atm to 0.2 atm at the fixed oxygen concentration, the measured MIE was found to vary with P-2 but the lowest MIE was observed at 0.8 atm.
The characteristics of flame spread were also investigated to provide fundamental knowledge to prevent fires and explosions of vehicles during launching operations. To this end, the rate of flame spread on the solid fuel was measured at elevated oxygen concentrations and reduced atmospheric pressures. A 0.18 mm diameter optical fiber was used as a solid fuel. The experimental results indicated that elevated oxygen concentrations can increase the rate of flame spread while increasing the atmospheric pressures to 1 atm can lead to decreases in the rate of flame spread. The increases in the rate of flame spread with pressure is due mainly to reductions in the convective heat loss that are clarified through an analysis of the pressure dependence on the convective heat transfer coefficient.
The characteristics of flame spread were also investigated to provide fundamental knowledge to prevent fires and explosions of vehicles during launching operations. To this end, the rate of flame spread on the solid fuel was measured at elevated oxygen concentrations and reduced atmospheric pressures. A 0.18 mm diameter optical fiber was used as a solid fuel. The experimental results indicated that elevated oxygen concentrations can increase the rate of flame spread while increasing the atmospheric pressures to 1 atm can lead to decreases in the rate of flame spread. The increases in the rate of flame spread with pressure is due mainly to reductions in the convective heat loss that are clarified through an analysis of the pressure dependence on the convective heat transfer coefficient.
목차
목 차Ⅰ. 서론1. 연구배경 및 필요성 12. 연구목적 및 내용 6Ⅱ. 실험장치 및 실험방법1. 실험장치 82. 실험방법 12Ⅲ. 실험결과 및 고찰1. 실험결과 및 고찰1) 최소점화에너지 172) 화염전파속도 20Ⅳ. 결론 26【참고문헌】 28
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