基于合成双射流的边条翼大迎角前缘涡控制研究

Numerical study of leading-edge vortex control of a strake-wing at large angles of attack based on Dual Synthetic Jets

  • 摘要: 边条翼在大迎角状态下会发生前缘涡涡破裂现象,气动性能显著降低,为解决这一问题,本研究提出一种基于合成双射流的涡破裂控制方法。在76°/40°边条翼的边条涡扫掠路径外侧安装合成双射流激励器,有效影响了边条涡的流动发展,改善了飞行器气动特性。结果表明,在自由来流马赫数为0.1情况下,施加控制后能推迟各迎角下的边条涡破裂点,在40°迎角时,涡破裂延迟量达到8.4%根弦长;同时,升力系数也得到了显著提升,在35°迎角时升力增量最大,达到7.51%。合成双射流激励器的两股射流以反相方式作用,持续推动低能气流同向旋转,实现了能量的有效注入,增强了边条涡抵抗逆压梯度的能力,延长了高速流动的流向距离,从而扩大了背风面的低压区面积,增加了涡升力。合成双射流对边条翼的气动力和涡破裂现象的控制效果显著,显示出其在细长机翼姿态控制方面的巨大潜力。

     

    Abstract: The leading-edge vortex rupture phenomenon occurs in stake-wing at large head-on angles, and the aerodynamic performance is significantly degraded. To solve this problem, a vortex rupture control method based on Dual Synthetic Jets is proposed in this study. Dual Synthetic Jets actuators are installed on the outside of the edge vortex sweep path of the 76°/40° strake-wing, which effectively influences the flow development of the edge vortex and improves the aerodynamic characteristics of the aircraft. The results show that the application of the control delays the rupture point of the sidebar vortex at each head-on angle at a free incoming Mach number of 0.1, and the vortex breakdown delay reaches 8.4% of chord length at 40° angle of attack; meanwhile, the lift coefficient is significantly improved, and the maximum lift increment reaches 7.51% at 35° angle of attack. The two jets of the Dual Synthetic Jets actuators act in an anti-phase manner to continuously push the low-energy airflow to rotate in the same direction, which achieves the effective injection of energy, enhances the ability of the sidebar vortex to resist the counterpressure gradient, and lengthens the flow distance of the high-velocity flow, thus enlarging the area of low-pressure zone on the leeward side, and increasing the vortex lifting force. The Dual Synthetic Jets is effective in controlling the aerodynamic forces and vortex rupture phenomenon of the strake-wing, showing its great potential in the attitude control of slender wings.

     

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