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NTIS 바로가기한국항공우주학회지 = Journal of the Korean Society for Aeronautical & Space Sciences, v.48 no.9, 2020년, pp.731 - 743
황기영 (Institute of Advanced Transportation Vehicles, Chungnam National University) , 허환일 (Department of Aerospace Engineering, Chungnam National University)
The hypersonic glide vehicle ascends to a high altitude by a rocket booster, separates it from the booster, and glides at a hypersonic speed of Mach 5 or higher at an altitude of about 30~70 km, changing its direction in the atmosphere. Since it moves on an unpredictable flight path rather than a pa...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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미국의 극초음속 활공 비행체 개발은 어떻게 진행되고있나? | 1) 미국은 높은 양향비를 가진 날개 형상의 HTV-2 HGV를 개발하여 비행시험을 2회 수행했지만 대기권재진입 직후 예상보다 큰 Yaw와 Roll 발생으로 비행제어가 불가능하여 모두 실패하였고, 이와 비슷한 시기에 개발된 원뿔 형상의 AHW HGV는 비탄도 활공 궤적에 따라 극초음속으로 3,700km 거리를 30분간 성공적으로 비행함으로써 극초음속 활공 비행 가능성을 확인하였다. 최근에는 TBG, C-HGB 등 HGV 자체 개발뿐만 아니라 부스터와 결합된 지상/함정 (잠수함)/공중 발사 미사일인 LRHW, ARRW 등을 개발하고 있다. | |
처음 부스트 활공을 발견하게 된 계기는? | 부스트 활공(boost-glide) 개념은 높은 고도에서 화살촉(arrow shell)이 발사될 때 훨씬 더 멀리 이동하는 것을 발견한 독일 포병 장교들에 의해 처음 인지되었다. 이들은 공기가 희박한 높은 고도에서 궤적이 길어지는 것은 초음속에서 공기역학적 양력을 생성시킬 수 있는 받음각(Angle of Attack, 이하 AoA)을 가진 화살촉에서 발생한다는 것을 알게 되었다. | |
마하수 5 이상의 극초음속 기술은 어디에 이용되는가? | 마하수 5 이상의 극초음속 기술은 무기, 항공기, 우주선 등에 이용되며, 극초음속 무기로는 극초음속 순항 미사일(hypersonic cruise missile), 극초음속 활공 비행체(Hypersonic Glide Vehicle, 이하 HGV), 탄도 미사일(ballistic missile) 등이 있다. 극초음속 공기흡입(air-breathing) 비행체인 경우 미국 NASA는 2004년에 X-43A 비행체로 10초간 스크램제트 엔진(수소연료)을 작동하여 최대 마하수 9. |
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