Abstract: The aerodynamic characteristics of an X-37B-like vehicle in different flight conditions were numerically studied under 50km altitude. The CFD results were analyzed with experimental results of the Space Shuttle and the X-34 vehicle. Numerical simulations indicate that the lift-to-drag ratio of the X-37B-like vehicle is slightly different from that of the Space Shuttle under high Mach number and large angle-of-attack reentry conditions, so the lateral maneuverability of the two vehicles is equivalent. Under subsonic and small angle-of-attack conditions, the lift to drag ratio of the X-37B-like vehicle is higher than the Space Shuttle and lower than that of the X-34 vehicle which indicates that the maneuverability at low speed and the fixed point landing ability of the X-37B-like vehicle are better than that of the Space Shutter but weaker than that of the X-34 vehicle. Configuration differences of winged reentry vehicles have little influence on the lift-to-drag radio of high Mach number and large angle of attack, and have obvious influence on thelift-to-drag radio of subsonic and small angle-of-attack.

Key words: Numericalsimulation, Aerodynamics, Reentry, Reusablespacecraft