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Volume 41 Issue 4
Apr.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(4): 616-623.
WANG Yufu, TAO Guoquan, LIU Dongxu, et al. Analysis of stratospheric lighter-than-air vehicle's aerodynamic characteristics based on large eddy simulation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(4): 616-623. doi: 10.13700/j.bh.1001-5965.2014.0535(in Chinese)
Citation: WANG Yufu, TAO Guoquan, LIU Dongxu, et al. Analysis of stratospheric lighter-than-air vehicle's aerodynamic characteristics based on large eddy simulation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(4): 616-623. doi: 10.13700/j.bh.1001-5965.2014.0535(in Chinese)
shu

Analysis of stratospheric lighter-than-air vehicle's aerodynamic characteristics based on large eddy simulation

doi: 10.13700/j.bh.1001-5965.2014.0535

  • School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 30 Aug 2014
  • Rev Recd Date: 10 Oct 2014
  • Publish Date: 20 Apr 2015
    Abstract
  • Flowing over stratospheric lighter-than-air vehicle (SLV) with spherical capsule shape at supercritical Reynolds number were simulated by using large eddy simulation (LES) method. Meanwhile, the results at different sphere spacing were analyzed and compared so that the influence of different sphere spacing on stratospheric lighter-than-air vehicle's aerodynamic characteristics was obtained. Compared with the results of the experiments, the calculations of time-average drag coefficients agreed well with Achenbach's experimental results in the single sphere. The method was verified accurate on the analysis of flow over spheres at supercritical Reynolds number. The drag coefficients of the two spheres at different sphere spacing and frequency spectrum were studied. With the increase of the upstream and downstream spheres' spacing, the whole drags increased first, then decreased, and the the dominant frequencies of G=1.5D and G=2D. With the increasing of G, the interaction between the two spheres and the influence of upstream sphere's trailing vortex to downstream sphere's trailing vortex waned.

     

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