基于马赫线切割的楔形乘波前体改进设计研究

In order to improve the detrimental impact on lateral static stability caused by the large negative-dihedral angle of the wedge-derived waverider forebody, the improved design based on the Mach Line Cutting of Compression Surfaces (MLCCS) was developed. The MLCCS principle provided the basis for improving the compression surfaces of the inlet without affecting the inlet flow. The critical parameters for the shock wave detached from the leading edge of swept wedges were obtained by the oblique shock equations. And the parameters were used in the improved design to guarantee the attached shock wave. The improved waverider forebody was designed and numerical simulations were taken. The inviscid results show that the uniform pre-compression inflows provided by the wedge-derived and the improved waverider forebodies are identical, and the lift-to-drag ratio increased. The lateral static stability of the waverider forebody gets an effective improvement. And the shock is still attached to the leading edge of the improved waverider forebody. The viscous results indicate that the improved waverider forebody still have higher lift-to-drag ratio than the wedge-derived waverider forebody, and the shock is just detached from the leading edge for a short distance.