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Leading-edge vortices over swept-back wings with varying sweep geometries

机译：后掠翼上的前缘涡旋具有不同的掠掠几何形状

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摘要

Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing designs and lift generation techniques including leading-edge vortices (LEVs). Observation of natural fliers, e.g. birds and bats, has shown that LEVs are a major contributor to lift during flapping flight, and the common swift (Apus apus) has been observed to generate LEVs during gliding flight. We hypothesize that nonlinear swept-back wings generate a vortex in the leading-edge region, which can augment the lift in a similar manner to linear swept-back wings (i.e. delta wing) during gliding flight. Particle image velocimetry experiments were performed in a water flume to compare flow over two wing geometries: one with a nonlinear sweep (swift-like wing) and one with a linear sweep (delta wing). Experiments were performed at three spanwise planes and three angles of attack at a chord-based Reynolds number of 26 000. Streamlines, vorticity, swirling strength, and Q-criterion were used to identify LEVs. The results show similar LEV characteristics for delta and swift-like wing geometries. These similarities suggest that sweep geometries other than a linear sweep (i.e. delta wing) are capable of creating LEVs during gliding flight.
机译：微型飞行器用于多种应用，例如运输和测量。通过研究机翼设计和包括前沿涡流（LEV）在内的升力产生技术，可以提高其性能。观察天然传单，例如鸟类和蝙蝠表明，LEV在扑翼飞行过程中起举的主要作用，并且观察到常见的迅捷（Apus apus）在滑翔飞行过程中会产生LEV。我们假设非线性后掠机翼在前缘区域产生涡旋，这可以在滑翔飞行中以类似于线性后掠机翼（即三角翼）的方式增加升力。在水槽中进行了颗粒图像测速实验，以比较两种机翼几何形状上的流动：一种具有非线性波及（线性像机翼），另一种具有线性波及（三角翼）。在基于弦的雷诺数为26000的情况下，在三个翼展方向平面和三个迎角进行了实验。流线，涡度，旋流强度和Q准则用于识别LEV。结果表明，三角洲和类似机翼的几何形状的LEV特性相似。这些相似之处表明，除线性扫掠（即三角翼）以外的扫掠几何形状还能够在滑行飞行中创建LEV。

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