考虑机翼尾流影响的运输类飞机后体气动外形优化设计（英文）

Afterbody aerodynamic optimization design of transport airplane considering wing wake flow

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。

The aerodynamic optimization design of typical transport afterbody considering the influence of the wing wake flow is studied.An optimization framework is established for the aircraft configuration and used for afterbody optimization at crui-sing status.The objective of this framework is to optimize the afterbody considering the influence from other parts of aircraft and the engineering constraints simultaneously.The spatial property of the afterbody in spatial control frame is established by implementing the free form deformation （FFD）approach.The NURBS spline is chosen as the basis function,which can represent the property of spatial control element and is suitable for afterbody geometry.Infinite interpolation deforming grid technique is adopted to update spatial grid with high efficiency and mesh quality.The modified Kriging surrogate model and quantum particle swarm algorithm are included in the optimization system to increase efficiency and ability to find global op-timal solution.In order to reduce drag at cruising status,upswept angle and cross section shape are optimized as the main afterbody configuration parameters.The result of the case shows that the aerodynamic performance of the transport’s body is improved after the optimization.