栅格翼外形特征对减阻影响的研究

栅格翼相对平板翼有其独特的优越性，对其气动特性进行优化很有必要。采用风洞实验和数值计算的方法，分别对不同翼弦格宽比的栅格翼及不同后掠方式的栅格翼进行了研究，风洞实验结果显示，栅格翼的翼弦格宽比存在一个气动性能的最佳值，使得升阻比最大；数值计算结果证明栅格翼前缘局部后掠能有效减小波阻，是一种新的减小栅格翼阻力的方式。

Investigations of grid fins geometric feature influence on drag reduction

Grid fins have unique advantages compared to planar fins. It is important to study and optimize the aerodynamic characteristics of grid fins. The effects of different chords and swept angles of the grid fins on the aerodynamic characteristics of a missile in the subsonic/transonic flow regime were investigated with wind tunnel tests and numerical simulations. The wind tunnel results indicate that aerodynamic characteristics of grid fins varies with the chord-to-width ratios. There is a chord-to-width ratio of optimal aerodynamic characteristics for the grid fins. CFD results show that the novel design of the grid fins has distinct advantages in comparison to the conventional configurations. The grid fins swept back locally can obviously reduce the wave drag. This is a novel design to reduce the drag of gird fins.