가시화 기법을 사용한 자유낙하하는 반구모델의 자세각 및 항력계수 측정

국문 초록 (Abstract)

마하수 6 조건에서 반구 모델에 대해 자세각의 변화에 따른 항력계수를 연구하였다. 충격파 터널에서 실험이 진행되었으며 지지대 유동 간섭을 최소화하기 위해 자유낙하 기법을 사용하였다. 자유낙하하는 반구 모델의 자세와 항력계수를 측정하기 위해 계단식 모듈과 전자석을 이용한 자유낙하 기법을 구축하였고 초고속 카메라를 통한 shadowgraph 기법을 사용하였다.

다국어 초록 (Multilingual Abstract)

In this work, the effect of attitude angle variation on drag coefficients of hemisphere in a Mach 6 flow has been investigated. Experiments were conducted in a shock tunnel and a free-falling technique was used to minimize flow disturbance by a sting. For attitude and drag coefficient measurements of a free-falling hemisphere, a free-falling technique based on a releasing mechanism with a stair-typed module and an electromagnet was developed. A shadowgraph technique was used for flow visualization using a high-speed camera.

목차 (Table of Contents)

• ABSTRACT
• 초록
• Ⅰ. 서론
• Ⅱ. 실험 구성
• Ⅲ. 분석
• Ⅳ. 실험결과
• Ⅴ. 결론
• References

참고문헌 (Reference)

1 박진우, "충격파 풍동에서의 자유 낙하 장치를 활용한 힘 측정" 한국항공우주학회 44 (44): 463-467, 2016

2 Pick, G. S, "Sting Effects in Hypersonic Base Pressure Measurements" Naval Air Systems Command

3 Lee, S, "Shock Tunnel Build-up and Flow Verification Considering Real Gas Effect" The Korea Institute of Military Science and Technology 2016

4 Igra, O, "Shock Tube Sutdy of the Drag Coefficient of a Sphere in a Nonstationary Flow" 1992

5 Baer, A. L, "Pressure Distributions on a Hemisphere Cylinder at Supersonic and Hypersonic Mach Numbers" Armed Serviced Tecnical Information Agency

6 Oosthuizen, P. H, "Introduction to Compressible Fluid Flow" CRC Press 115-, 2014

7 Anderson, J. D., Jr, "Hypersonic and High Temperature Gas Dynamics" AIAA 54-63, 2006

8 Tuttle, S. L, "Hypersonic Drag Measurement in Free Piston Shock Tunnels" 1992

9 "Gas dynamics calculator" Wisconsin Shock Tube Laboratory

10 Hideyuki, T, "Free-flight Force Measurement Technique in Shock Tunnel" 2012

11 Bailey, A. B, "Free-Flight Measurements of Sphere Drag at Subsonic, Transonic, and Supersonic and Hypersonic Speeds for Continuum, Transition and Near-Free-Molecular Flow Conditions" Arnold Engineering Development Center 1971

12 Henderson, C. B, "Drag Coefficients of Spheres in Continuum and Rarefied Flows" 14 (14): 707-708, 1976

13 Neely, A. J, "Determining Aerodynamic Coefficients From High Speed Video of a Free-flying Model in a Shock Tunnel" 7126 : 2009

14 Moffat, R. J, "Describing the Uncertainties in Experimental Results" 1 (1): 3-17, 1988