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NTIS 바로가기한국추진공학회지 = Journal of the Korean Society of Propulsion Engineers, v.17 no.6, 2013년, pp.120 - 130
김정수 (Department of Mechanical Engineering, Pukyong National University) , 정훈 (Department of Mechanical Engineering, Graduate School, Pukyong National University) , 김종현 (Department of Mechanical Engineering, Graduate School, Pukyong National University)
A study was conducted for the performance characteristics of methane taking recently the limelight in the world as a next-generation propellant, with the survey for state of the art in the development of methane/oxygen rocket engine being accompanied. Liquid methane as a rocket fuel has the favorabl...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
XR-3M9란 무엇인가? | 메탄/산소 자세제어용 엔진인 XR-3M9는 사설 투자자본에 의해 설계/제작/시험이 시작되었고, 미국 중소기업기술혁신촉진 프로그램을 통해 미공군의 지원을 받으며(AFRL SBIR Phase I Contract) 그 연구/개발이 본격화 되었다. Fig. | |
자세 제어용 엔진의 대표적인 추진제는 무엇인가? | 현재 운용되고 있는 우주발사체의 주 엔진(main engine)은 Kerosene/LOx 혹은 LH2/LOx 추진제 조합이 주를 이루고 있으며, MMH(혹은 UDMH)/NTO 및 하이드라진(N2H4) 등은 자세 제어용 엔진의 대표적인 추진제로 사용 중이다[2,3]. 20세기 말에 이르러서는 추진기관의 개발․운용에 있어 환경문제 및 추진제 취급안전성, 그리고 경제성 등이 대두되면서 우주기술 선진국을 중심으로 친환경 추진제에 대한 연구수요가 증가하고 있는 추세이다[4]. | |
케로신과 비교해 메탄 추진제가 갖는 이점은 무엇인가? | 메탄을 연료로 적용하는 경우의 연소실 온도(Tchamber)가 더 낮음에도 불구하고 특성속도(characteristic velocity, C*) 및 비추력(specific impulse, Isp) 성능이 케로신을 앞서는 것으로 평가된다. 케로신은 순도가 로켓 추진제 등급 보다 낮기는 하지만 각종 산업 및 가정용 연료 등으로 널리 활용되는 까닭에 정제/운송에 소요되는 비용이 저렴한데, 메탄은 그 케로신 보다 3배 이상 경제적이므로[11] 근래의 세계적 관심사인 저비용 추진제로서 적절한 것으로 판단된다. 뿐만 아니라, 향후 30-40년 이내에 고갈될 것으로 예측되는 케로신과 달리 그 매장량이 풍부하고(최소 100년 이상)[12] 타 산업에서의 활용도 또한 증가하는 추세이므로 유관기술 발전에 의한 추가적인 경제 효과도 기대된다. |
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