Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Numerical Prediction of Acoustic Load Around a Hammerhead Launch Vehicle at Transonic Speed

해머헤드 발사체의 천음속 음향하중 수치해석

  • Choi, Injeong (Department of Aerospace Engineering, Seoul National University) ;
  • Lee, Soogab (Department of Aerospace Engineering, Seoul National University)
  • Received : 2020.07.26
  • Accepted : 2020.12.07
  • Published : 2021.01.01
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Abstract

During atmospheric ascent of a launch vehicle, airborne acoustic loads act on the vehicle and its effect becomes pronounced at transonic speed. In the present study, acoustic loads acting on a hammerhead launch vehicle at a transonic speed have been analyzed using ��-ω SST based IDDES and the results including mean Cp, Cprms, and PSD are compared to available wind-tunnel test data. Mesh dependency of IDDES results has been investigated and it has been concluded that with an appropriate turbulence scale-resolving computational mesh, the characteristic flow features around a transonic hammerhead launch vehicle such as separated shear flow at fairing shoulder and its reattachment on rear body as well as large pressure fluctuation in the region of separated flow behind the boat-tail can be predicted with reasonable accuracy for engineering purposes.

발사체가 대기 중에서 상승 비행 시 공기역학적 현상에 기인한 음향하중을 받는데 천음속 영역에서 그 영향이 커진다. 본 연구에서는 천음속 조건에서 해머헤드 발사체 외부에 작용하는 음향하중을 ��-ω SST 난류모델 기반 IDDES 법으로 해석하여 시간 평균 압력계수, 표면 압력섭동, 압력섭동 파워 스펙트럼을 분석하고 가용한 풍동실험 데이터와 비교하였다. IDDES 결과의 격자 의존성을 검토하였으며, 난류 스케일 분해가 가능한 적절한 계산격자를 사용한 경우 천음속 헤머헤드 발사체의 특징적인 유동 현상인 페어링 어깨에서의 유동 박리와 박리 유동의 후방 동체 재 부착, 보트 테일 후방에서의 높은 압력섭동을 공학적으로 유의미한 정확도로 예측 가능함을 확인하였다.

Keywords

Acknowledgement

본 연구는 한국연구재단을 통해 미래창조과학부의 우주핵심기술개발사업(NSL)으로부터 지원받아 수행되었습니다(2018M1A3A3A02065892). 또한 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행되었습니다(No. 20194030202300).

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