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

  • 제45권8호
  • /
  • Pages.619-626
  • /
  • 2017
  • /
  • 1225-1348(pISSN)
  • /
  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
권호 표지
DOI QR코드

DOI QR Code

가시화 기법을 사용한 자유낙하하는 반구모델의 자세각 및 항력계수 측정

Attitude Angle and Drag Coefficient Measurements of Free-Falling Hemisphere Using a Visualization Technique

  • Song, Hakyoon (Korea Advanced Institute of Science and Technology) ;
  • Lee, Sungmin (Korea Advanced Institute of Science and Technology) ;
  • Lee, Jong Kook (Agency for Defense Development) ;
  • Park, Gisu (Korea Advanced Institute of Science and Technology)
  • 투고 : 2017.03.31
  • 심사 : 2017.07.18
  • 발행 : 2017.08.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

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.

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.

키워드

참고문헌

  1. Henderson, C. B., "Drag Coefficients of Spheres in Continuum and Rarefied Flows," AIAA Journal, Vol. 14, No. 6, 1976, pp.707-708. https://doi.org/10.2514/3.61409
  2. Baer, A. L., VKF., and ARO, Inc., "Pressure Distributions on a Hemisphere Cylinder at Supersonic and Hypersonic Mach Numbers," AEDC-TN-61-96. Virginia: Armed Serviced Tecnical Information Agency.
  3. Pick, G. S., "Sting Effects in Hypersonic Base Pressure Measurements," Washington, D. C.: Naval Air Systems Command.
  4. Tuttle, S. L., and Simmons, J. M., "Hypersonic Drag Measurement in Free Piston Shock Tunnels," 11th Australasian Fluid Mechanics Conference, 1992.
  5. Neely, A. J., West, I., Hruschka, R.. Mudford, N. R., and Park, G., "Determining Aerodynamic Coefficients From High Speed Video of a Free-flying Model in a Shock Tunnel," 28th International Congress on High-Speed Imaging and Photonics, Vol. 7126, 2009.
  6. Hideyuki, T., Tomoyuki, K., Laurence, S., and Hannemann, K., "Free-flight Force Measurement Technique in Shock Tunnel," 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012.
  7. Igra, O., and Takayama, K., "Shock Tube Sutdy of the Drag Coefficient of a Sphere in a Nonstationary Flow," 18th International Symposium on Shock Waves, 1992.
  8. Park, J., Chang, W. K., and Park, G., "Free-fall Force Measurement in a Shock Tunnel," The Korean Society of Aeronautical and Space Sciences, Vol. 44, No. 6, 2016, pp.463-467. https://doi.org/10.5139/JKSAS.2016.44.6.463
  9. Lee, S., Song, H., Lee, J. K., and Park, G., "Shock Tunnel Build-up and Flow Verification Considering Real Gas Effect," Military Science and Technology Conference, Daejeon: The Korea Institute of Military Science and Technology, 2016.
  10. Gas dynamics calculator, http://silver.neep.wisc.edu/shock/tools/gdcalc.html, Wisconsin Shock Tube Laboratory(WiSTL), retrieved on October 18, 2016.
  11. Oosthuizen, P. H., and Carscallen, W. E., Introduction to Compressible Fluid Flow, 2nd Ed., CRC Press, 2014, pp.115.
  12. Anderson, J. D., Jr., Hypersonic and High Temperature Gas Dynamics, 2nd Ed., AIAA, Virginia, 2006, pp.54-63.
  13. Moffat, R. J., "Describing the Uncertainties in Experimental Results," Experimental Thermal and Fluid Science, Vol. 1, No. 1, 1988, pp. 3-17. https://doi.org/10.1016/0894-1777(88)90043-X
  14. Bailey, A. B. and Hiatt, J., "Free-Flight Measurements of Sphere Drag at Subsonic, Transonic, and Supersonic and Hypersonic Speeds for Continuum, Transition and Near-Free-Molecular Flow Conditions," AEDC-TR-70-291, Arnold Engineering Development Center, 1971.