Correlations of unsteady vortex burst point and dynamic stability over a pitching double-delta wing
Correlations of unsteady vortex burst point and dynamic stability over a pitching double-delta wing
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DOI：
10.1016/j.ast.2020.106256
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发表时间：
2020-10
影响因子：
5.6
通讯作者：
Jian Liu;Jianqiang Chen;H. Ren;Yang Zhang;Xianyao He;Zhixiang Xiao
中科院分区：
文献类型：
--
作者：
Jian Liu;Jianqiang Chen;H. Ren;Yang Zhang;Xianyao He;Zhixiang Xiao
俯仰动稳定性对大迎角飞行器的气动性能有重要影响。通常，具有三角翼或双三角翼（DW或DDW）布局的飞机上的涡破裂流动的动态特性与俯仰动稳定性密切相关。采用延迟分离涡模拟方法[1]，对80°/65° DDW在失速AoA附近作正弦俯仰运动进行了数值研究。本文研究涡爆点非定常特性与俯仰动稳定性之间的关系。俯仰动稳定性的逆转与一个俯仰周期内上、下行程BP运动的不一致性密切相关。当BP的上游速度高于下游速度时，俯仰力矩的变化超前于AoA，这导致动态不稳定。相反，当下游速度高于上游速度时，DDW动态稳定。这种相关性可以通过涡破裂流与DDW模型之间的能量传递关系来解释。
Pitching dynamic stability is significant for the aerodynamic performance of an aircraft at a large angle of attack (AoA). Commonly, the dynamic behaviour of vortex breakdown flows over an aircraft with a delta or double-delta wing (DW or DDW) configuration is closely related to the pitching dynamic stability. An 80°/65° DDW subjected to sinusoidal pitching motions around the stall AoA was numerically investigated using the delayed detached eddy simulation method [1]. This study is focused on the correlation between the unsteady behaviour of the vortex burst point (BP) and pitching dynamic stability. The reverse of the pitching dynamic stability is closely related to the inconsistent movement of the BP during the upstroke and downstroke in one pitching period. When the upstream speed of the BP is higher than the downstream speed, the variation in the pitching moment is ahead of the AoA, which leads to dynamic instability. Conversely, when the downstream speed is higher than the upstream speed, the DDW is dynamically stable. This correlation can be interpreted through the energy transfer relationship between the vortex breakdown flows and DDW model.