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Physics and Control of the Flow over a Generic Trapezoidal Wing Planform

机译:普通梯形机翼平面流动的物理和控制

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This work provides discussion of key geometric features that influence the aerodynamic performance of trapezoidal wings. Subject of the survey is a highly tapered wing model with low aspect ratio, based on a NACA 0012 airfoil section. A comparison to a non-tapered swept-back wing demonstrates advantageous stability properties that motivate this work. Experimentally obtained force and moment data, surface flow visualization and PIV are presented along with computational results. It is found that the strength and formation of the leading-edge vortex can be altered by modifying the nose radius or droop of the model. Implications of those changes on integral aerodynamic properties are evaluated. A triangular and a parallel flap geometry that exhibit fundamentally different flow conditions are discussed. Focus is placed on the latter to account for non-aerodynamic requirements of typical military aircraft. The capability of sweeping jet actuators to redirect or attach flow is assessed to examine the resulting effects on forces and moments. Additionally, the possibility of applying active flow control as a means to maneuver is explored.
机译:这项工作讨论了影响梯形机翼空气动力学性能的关键几何特征。调查的对象是基于NACA 0012翼型截面的,具有低纵横比的高度锥形机翼模型。与无锥度后掠式机翼的比较显示出有利的稳定性能,可以激发这项工作。实验获得的力和力矩数据,表面流可视化和PIV以及计算结果都将显示出来。发现可以通过修改模型的机头半径或下垂来改变前缘涡流的强度和形成。评估了这些变化对整体空气动力学特性的影响。讨论了呈现出根本不同的流动条件的三角形和平行襟翼几何形状。重点放在后者上,以解决典型军用飞机的非空气动力学要求。评估了清扫式射流执行器重定向或连接流量的能力,以检查对力和力矩产生的影响。另外,探索了将主动流量控制作为操纵手段的可能性。

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