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 Journal of the Korea Institute of Military Science and Technology 2009;12(6):808-814.
 Numerical Study on the Aerodynamic Behavior of a Projectile with a Triangular Ballute Young-Rok Yang, Sung-Ki Jung, Ji-Heok Park, Sung-Ho Ahn, Byoung-Soo Kim, Tae-Hwan Cho 1GNU2KAI34GNU & Research Center for Aircraft Parts Technology 삼각 Ballute이 부착된 발사체의 수치적 공력해석 연구 양영록, 정성기, 박지혁, 안성호, 김병수, 조태환 1경상대학교2한국항공우주산업주식회사3국방과학연구소4경상대학교 & 항공기부품기술연구소 Abstract Numerical flow-filed computations have been conducted around a projectile with a triangular ballute at Mach numbers of 0.3 ~ 0.9 and angles of attack of $0^{circ};{sim};30^{circ}$. The expansion shape of a triangular ballute has been determined from both the manufacturing dimensions and the wind tunnel test results. It has been assumed that the shape does not alter after the ballute has been expanded completely. The computed results showed a good agreement with the wind tunnel test results. A sensitivity analysis on the aerodynamic coefficients has been performed to evaluate the quantitative effects on the flight performance. Trajectory simulation results were also in good agreement with the flight test results. Key Words: Aerocapture, Aerodynamic Decelerator, Ballute, CFD