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Volume 29 Issue 1
Jan.  2003
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Journal of Beijing University of Aeronautics and Astronautics  > 2003  >  29(1): 39-42.
Kong Fanmei, Hua Jun, Feng Ya'nan, et al. Effects of Geometry Parameters and Flow Parameters on Drag Coefficient of Upswept Afterbodies[J]. Journal of Beijing University of Aeronautics and Astronautics, 2003, 29(1): 39-42. (in Chinese)
Citation: Kong Fanmei, Hua Jun, Feng Ya'nan, et al. Effects of Geometry Parameters and Flow Parameters on Drag Coefficient of Upswept Afterbodies[J]. Journal of Beijing University of Aeronautics and Astronautics, 2003, 29(1): 39-42. (in Chinese)
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Effects of Geometry Parameters and Flow Parameters on Drag Coefficient of Upswept Afterbodies

  • Dept. of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics

  • Received Date: 06 Jul 2001
  • Publish Date: 31 Jan 2003
    Abstract
  • The flows over upswept afterbodies were investigated by a numerical method based on 3D compressible N-S equations, in order to study effects of geometry parameters and flow parameters on drag coefficient of upswept afterbodies. The results showed that the pressure drag coefficient increases rapidly with increasing upswept angle and contraction ratio respectively, and with decreasing forebody incidence. The friction drag coefficient increases with increasing afterbody fineness ratio and decreasing Reynolds Number. The more the afterbody flatness, the more the pressure drag. The wave drag coefficient also increases with increasing upswept angle at transonic speed.

     

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  • [1] Wortman A. Reduction of fuselage form drag by vortex flows[J]. Journal of Aircraft,1999,36(3) [2] Epstein R J,Carbonaro M C,Caudron F. An experimental investigation of the flow field about an upswept afterbody. AIAA-94-1840-CP,1994 [3] Huang Y, Ghia U,Osswald G A, et al. Analysis and numerical simulation of 3-D flow past axisymmetric afterbody using Navier-Stokes equations. AIAA-93-0683,1993 [4] Kolesar C E, May F W. An aftbody drag prediction technique for military airlifters. AIAA-83-1787, 1983 [5] 孔繁美,华 俊,冯亚南,等.大上翘角机身后体流动机理研究. 空气动力学学报,2002,20(3):326~331 Kong Fanmei, Hua Jun, Feng Ya'nan, et al. Investigation of the flow mechanism on the afterbody with larger upswept angle[J]. Acta Aerodynamica Sinica,2002,20(3):326~331(in Chinese)
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