翼身融合背撑发动机布局的动力短舱设计

To solve the problem of aircraft-engine flow interference of Blend-Wing-Body (BWB) configuration with podded engines, this paper presents the design principles for podded nacelles based on the BWB flow characteristics. The axisymmetric nacelles should be taken into account together with the fan cowl profile which could reduce the influence of nacelle external flow on the airframe and the intake profile which meets the requirements of intake efficiency. Based on the parameterization method and multipoint optimization design method for powered nacelles established in this paper, the nacelles optimization considering both internal and external flow is carried out. Finally, the flowfield of the installed engine nacelle is analyzed. The results show that the design method proposed in this paper can provide the design options with different internal and external aerodynamic characteristics and meet the multipoint design requirements of the power nacelle for BWB with podded engines. The peak Mach number at cruise and full thrust condition can be reduced by 8.35% and 11.81% respectively to the largest extent. The optimization results also have good intake performance at maximum thrust and crosswind takeoff condition. For the installed nacelle configuration, the strong shock wave between engine and airframe and the rear body separation at high speed cruise condition is eliminated, and the airframe external flow provides uniform and stable intake for the engine at low speed condition with high angle of attack, meanwhile, the intake total pressure recovery coefficient meets the design requirements.