Adjoint-based design optimization considering both aerodynamic and near-field sonic boom

The development of aerodynamic&sonic boom accompanied optimization design method is of great significance to the development of the generation of supersonic passenger aircraft. The typical aerodynamic&sonic boom accompanying optimization design methods are classified as two types: the adjoint inverse design optimization of the near-field signal and the far-field sonic boom prediction coupling adjoint design optimization. Combining the latest development of discrete adjoint method near-field signal inverse design optimization with aerodynamic characteristics optimization, a near-field sonic boom adjoint inverse design strategy that takes into account aerodynamic characteristics is proposed. Firstly, it summarizes the solution of the adjoint equation gradient and the proposed near-field overvoltage extraction and target overvoltage assembly process based on the signal ray method, and verifies the accuracy of the near-field signal and ground waveform prediction during the optimization process. Secondly, for the standard model of supersonic civil aircraft, a comparative study of three optimization strategies was carried out: low drag optimization, near-field low-boom inverse design, and near-field low-boom inverse design with aerodynamic characteristics. The results show that the near-field low-boom inverse design with aerodynamic characteristics strategy performs better in the comprehensive improvement of aerodynamic and low-boom characteristics, and further proves the application potential of the proposed optimization strategy in the design of supersonic civil aircraft.