Multipoint Design of Vortex Generators on a Swept Infinite-Wing under Cruise and Critical Condition
Multipoint Design of Vortex Generators on a Swept Infinite-Wing under Cruise and Critical Condition
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DOI：
10.2514/6.2015-2726
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Nobuo Namura;K. Shimoyama;S. Obayashi
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文献类型：
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作者：
Nobuo Namura;K. Shimoyama;S. Obayashi
利用计算流体力学(CFD)对后掠无限大翼上的涡流发生器布置进行了参数研究和多点设计优化，以探索在巡航和临界条件下的理想涡流发生器布置。我们研究了VG高度、长度、入射角和间距对小迎角升阻比的影响，这决定了巡航条件下的气动性能，失速特性表现为代表临界状态的升力曲线。该模型考虑了超临界矩形机翼上的单个VG，并在展宽方向采用周期边界条件，以降低CFD分析的成本。计算结果表明，间距主要影响小迎角时的升阻比，而对大迎角时的升力系数影响不大。间距决定了自拍开始时的攻角。相反，高度控制升力曲线的形状和最大升力系数，而在小迎角时，高度对升阻比的影响比间距小得多。优化和参数研究结果表明，VG高度和入射角控制着巡航和临界条件下气动性能的平衡，而长高比较大的VGS获得了比常规VGS更好的性能。
Parametric study and multipoint design optimization of vortex generator (VG) arrangements on a swept infinite-wing are performed by using computational fluid dynamics (CFD) to explore a desirable VG design under both cruise and critical condition. We examine the effects of VG height, length, incidence angle, and spacing on lift-drag ratio at a low angle of attack, which determines aerodynamic performance under cruise condition, and stall characteristics shown as lift curves representing critical condition. The present simulation model considers a single VG equipped on a super-critical rectangular wing and the periodic boundary condition is adopted in the span direction to reduce the cost of CFD analysis. Computational results show that the spacing affects mainly on the lift-drag ratio at a low angle of attack but has no effect on values of lift coefficients at a high angle of attack. The spacing determines the angle of attack at which buffet begins. In contrast, the height controls the shape of lift curves and maximum lift coefficients while it has much smaller effect on lift-drag ratio at a low angle of attack than the spacing. Both optimization and parametric study results show that the VG height and incidence angle control the balance of aerodynamic performances under cruise and critical condition while VGs with higher length to height ratio achieve better performances than conventional VGs.