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A two-dimensional steady Reynolds-averaged Navier–Stokes (RANS) equation was solved to investigate the effects of a Gurney flap on SFYT15thick airfoil aerodynamic performance. This airfoil was designed for flight vehicle operating at 20 km altitude with freestream velocity of 25 m/s. The chord length (C) is 5 m and the Reynolds number based on chord length is Re=7.76×105. Gurney flaps with the heights...
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