| Citation: | WANG Longfang, HE Weiliang, WANG Shichaoet al. Effects of canopy's air permeability on parafoil aerodynamic performance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(10): 2021-2029. doi: 10.13700/j.bh.1001-5965.2016.0764(in Chinese)
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In order to enhance the flight performance of parafoil, the effects of canopy fabric's air permeability on parafoil aerodynamic performance were studied. The canopy external flow field was modeled by the incompressible Reynolds-averaged Navier-Stokes (RANS) equations, and the governing equations for porous medium domain with an additional momentum source term were established to model the canopy. For two material models with air permeability and one traditional model without air permeability, the aerodynamic characteristics and distribution of the two-dimensional and three-dimensional flow field were numerically simulated under steady condition. The results indicate that the canopy seepage velocity is available by solving the governing equations of porous medium domain, and the canopy external turbulivity increases sharply. The lift coefficient decreases and drag coefficient increases significantly when the canopy is made of large air permeability fabric, and furthermore the inner cavity pressure dropping affects the aerodynamic shape maintaining of parafoil. The lift coefficient is less than that in impermeable case at small angle of attack, and is greater than that in impermeable case at large angle of attack when the canopy is made of slight air permeability fabric because mild seepage velocity can delay the boundary layer separation at large angle of attack.
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