翼身融合民机总体气动技术研究进展与展望

It is well known that the Blended-Wing-Body (BWB) layout is a mainstream scheme for the next-generation subsonic civil aircraft. The research of BWB is accelerating, and is expected to be applied to engineering. On the basis of reviewing the development history of BWB civil aircraft, the differences between Flying Wing (FW) and BWB layouts are explained from different aspects, clarifying the conceptual features and applicational scopes of BWB. This paper focuses on the technical challenges and countermeasures in BWB conceptual and aerodynamic designs, analyzing the technical bottleneck and evolution of design ideas, the key technologies of conceptual design such as the new structure, weight estimation and airworthiness compliance, the key technologies of aerodynamic configuration design such as the aerodynamic configuration design principles, and the trade-off between high and low speed performance. Moreover, the propulsion airframe integration problems of BWB layout including the aircraft-engine interference, the integrated design, and the new engine technology application are discussed. Then the noise reduction technology and the derived design contradiction of BWB, and conceptual design strategies considering noise requirements are discussed. Finally, the development trend of BWB civil aircraft is prospected from the aspects of technological progress and engineering achievability.