论文部分内容阅读
针对微型飞行器,采用动网格方法计算了旋转超前、同步、滞后3种拍动模式下的平板升力性能.通过比较分析二维、三维拍动平板的升力性能以及尾涡分布变化,探讨了拍动平板升力性能与其运动规律的关系.计算表明:旋转同步和超前模式下的平板升力系数明显高于旋转滞后模式下的平板升力系数;二维、三维平板升力系数均随角振幅的增大而减小,随相位差的增大而增大,拍动振幅的影响相对较小;角振幅较大时,旋转超前模式中三维平板升力系数均明显高于二维平板升力系数,旋转同步模式中二维、三维平板升力系数变化不明显,旋转滞后模式中仅当小角振幅且小平移振幅时,三维平板升力系数增加较大.
Aiming at the micro-aircraft, the lift performance of three kinds of flapping modes with rotation, synchronization and hysteresis are calculated by the moving mesh method.Through the comparison and analysis of the lift performance of the two-dimensional and three-dimensional flaps and the variation of the wake vortex distribution, The results show that the lift coefficient of the plate in the rotating synchronous and lead modes is obviously higher than that of the rotating plate in the rotational hysteresis mode. The lift coefficients of two-dimensional and three-dimensional plates both increase with the increase of the angular amplitude And the influence of the amplitude of the flapping is relatively small. When the angular amplitude is larger, the lift coefficient of the three-dimensional plate in the rotating lead mode is obviously higher than that of the two-dimensional plate. In the synchronous mode of rotation The lift coefficients of two-dimensional and three-dimensional plates are insignificant, while the lift coefficient of three-dimensional plates increases only when the small angular amplitude and the small translation amplitude in the rotation hysteresis model.