基于FFD与网格重构的飞翼无人机外形优化设计

Aerodynamic Design Optimization for a Flying-wing UAV Based on FFD and Grid Reconstruction

为了使气动优化适应外形大尺度变化和外形高效参数化的需要,将外形高效参数化建模方法(FFD)与适合外形剧烈变化的网格重构方法相结合,对飞翼无人机外形完成了气动优化设计。外形参数化建模采用自由变形法(FFD),网格生成基于贴体笛卡儿自动网格重构技术,通过优化设计使飞翼无人机的气动性能得到了有效提升,布局升阻比增加了7.9%。优化结果表明,基于该技术的气动优化设计方法对大尺度变化外形具有良好的适应性。

In order to suit the needs of large scale changes and high efficiency parameterization of aircraft shape in aerodynamic optimization, the high efficiency parameterized modeling method of Free-Form Deformation （FFD） was combined with the grid reconstruction method, which adapted to drastic changes in shape. Then the aerodynamic configuration optimization for the flying-wing UAV vehicle was conducted. The shape parameterized modeling was based on FFD technology, mesh generation was based on the Cartesian automatic grid reconstruction technology. The aerodynamic performance of the flying-wing UAV is effectively enhanced through the design optimization, and the lift-to-drag ratio of the optimum design is increased 7.9% compared to the original one. The optimization results show that the aerodynamic design optimization method based on this technique has good flexibility to large scale variation of shape.