Stealth Constrained Multi-objective Aerodynamic Shape Optimization Design

Recently, with the higher and higher requirement of the survival ability of the advanced tactical fighter, supersonic cruise has been required as one of the important performance. Supersonic drag prediction has been regarded as an important problem in aerodynamic performance calculation and drag prediction is related to the feasibility of aircraft optimization design system, so in this paper, supersonic drag prediction is discussed as an important part of the optimization design system.For advanced tactical fighter, besides excellent aerodynamic performance, stealthy performance is an important factor for aircraft configuration design. The low RCS level of the fighter's geometry is also thought as the basis on and the key to high stealthy performance.Therefore, in this paper the multi-objective optimization design of aerodynamic and stealthy configuration for the fighter is discussed according to the geometrical characteristics of the advanced tactical fighter. The work is performed as follows:1 According to the different design requirement in subsonic and supersonic state, with the multi-objective optimization method, the aerodynamic configuration optimization method for different design requirements has been obtained.2 To meet the need of aerodynamic configuration optimization design in supersonic state, different supersonic drag prediction methods have been compared and the supersonic performance calculation method suitable for optimization design system has been obtained.3 Based upon the knowledge discussed above, with the multi-subject optimization method, the optimization design system of integration of aerodynamic configuration and stealth is built up. Finally, the optimization work of one concrete model of the advanced tactical fighter is well done by using such integration design system. As compared to the original configuration, the integral performance of aerodynamic and stealth has improved after optimization.