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在某典型运输机翼身组合体的构型上,进行了考虑机翼尾流影响的机身后体气动外形优化设计研究。基于翼身组合体构型建立了考虑尾流影响和部分工程约束的优化设计系统,并对后体构型在巡航状态下进行了优化设计。以比较适合描述后体变形的NURBS样条基函数为空间控制体属性引入FFD自由变形技术,通过在FFD控制框架对该运输机后体进行了空间属性构建。采用无限差值动网格技术提高空间网格的更新效率并保证网格质量。利用改进Kriging代理模型、量子粒子群优化算法提高优化效率和全局寻优能力。为减小巡航阻力,对某运输机后体的上翘角、截面形状等参数进行了优化设计,优化结果显示,设计后的机身气动特性明显提高。
In the configuration of a typical transport wing body assembly, the aerodynamic shape optimization design of the fuselage rear body considering the wing wake influence is studied. Based on the configuration of the wing-body assembly, an optimal design system considering wake influence and some engineering constraints is established, and the rear configuration is optimized under cruising conditions. The FFD free deformation technique was introduced to describe the space control body attributes by using the NURBS spline basis function which is more suitable for describing the deformation of the rear body. The FFD control framework was used to construct the spatial attributes of the rear body of the transport aircraft. Adopting infinite difference dynamic grid technology to improve the space grid update efficiency and ensure grid quality. Using improved Kriging agent model and quantum particle swarm optimization algorithm to improve the optimization efficiency and global optimization ability. In order to reduce the cruising resistance, the optimal design of the upper hump angle, cross-sectional shape and other parameters of a transport aircraft was optimized. The optimized results show that the aerodynamic characteristics of the designed fuselage are obviously improved.