折叠方式对折叠翼气动及展开特性的影响

Effect of folding type on aerodynamic characteristics and deployment process of the folding wing

折叠方式对折叠翼的气动特性及展开特性有重要影响。对对称折叠、顺向折叠方式下折叠翼的气动特性及展开运动过程分别进行了数值模拟仿真和动力学仿真,比较了折叠方式对折叠翼气动特性、展开运动特性的影响,并分析其影响机制。计算结果表明,相对状态下,与对称折叠时相比,顺向折叠时,下折叠翼所受气动力减小,上折叠翼略有增大,导致负攻角情况下顺向折叠时,下折叠翼展开时间增加,展开同步性增强;正攻角情况下下折叠翼展开时间减小,展开同步性减弱。侧滑状态下,两种折叠方式下折叠翼展开时间基本相当,由于背风侧下折叠翼展开时间减小,导致顺向折叠时折叠翼展开的同步性有所减弱。同时,在小展开角度下,顺向折叠时全弹纵向静稳定性有所提高。

The folding type has a significant effect on the aerodynamic characteristics and unfolding process of the folding-wing. For two classic folding types,which are FWSDW (folding-with-symmetry-direction-wing)and FWCDW (folding-with-consistent-direction-wing),numerical method has been used to study their aerodynamic and unfolding characteristics.The simulation results show that,comparing to the FWSDW,the FWCDW can acquire less normal aerodynamic force on the lower part of the folding-wing,but it is a little more on the upper part.As a result,when the angle of attack is negative,the FWCDW has a longer unfolding time on the lower part,which makes the unfolding synchronization increase.when the angle of attack is positive,the FWCDW has a shorter unfolding time on the lower part,which can reduce the unfolding synchronization.Overall,the static stability of FWCDW has been improved compared with the FWSDW.