Solving accuracy for flush airdate sensing system of hypersonic aircraft under different configuration

In this paper, a 1/10 scale of X-33 front-end model was built, and computational fluid dynamics (CFD) method was used to compute the pressure distribution. The triples method was then applied to solving the angle of attack and sideslip angle. The data correction was accomplished by adopting least square method. By constructing different FASD configuration and changing the layout of the points, the different solving results were calculated. Finally the results of different layouts were compared and analyzed. The results show that, the symmetry layout of measurement points is effective for blunt body shape; the max errors of angle-of-attack is 0.3°, the distant points layout is better than the close points layout for solution accuracy; the data instability exists in the non-symmetrical layout while solving the angle of attack.