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首页> 外文期刊>International journal of micro air vehicles >Aerodynamic comparisons of flexible membrane micro air vehicle wings with cambered and flat frames
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Aerodynamic comparisons of flexible membrane micro air vehicle wings with cambered and flat frames

机译：具有弧形和扁平框架的柔性膜式微型飞机机翼的空气动力学比较

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Flexible membrane wings at the micro air vehicle scale can experience improved lift/drag ratios, delays in stall, and decreased time-averaged flow separation when compared to rigid wings. This research examines the effect of frame camber on the aerodynamic characteristics of membrane wings. The frames for the wings were 3D printed using a polymer-based material. The membranes are silicone rubber. Tests were conducted at Re similar to 50,000. Aerodynamic force and moment measurements were acquired at angles-of-attack varying from -4 to 24 degrees. Additionally, digital image correlation data were acquired to assess time-averaged shapes of the membrane wings during wind tunnel tests. An in-house program was developed to average the deflection plots from the digital image correlation images and produce time-averaged shapes. Lifting-line theory based on the time-averaged shapes was then used to calculate theoretical lift and induced drag coefficients, showing that the time-average shape of the membrane under load contributes extensively to the aerodynamic performance. The results show that introducing camber to the frames of membrane wings increases aerodynamic efficiency.
机译：与刚性机翼相比，微型飞行器规模的柔性膜翼可提高升力/阻力比，延缓失速并减少平均时间流分离。这项研究研究了框架弯度对膜翼气动特性的影响。机翼的框架使用聚合物基材料3D打印。膜是硅橡胶。在Re上进行了大约50,000的测试。在攻角从-4到24度变化的条件下获取了气动力和力矩测量值。另外，获取数字图像相关数据以评估风洞测试期间膜翼的时间平均形状。开发了一个内部程序来平均数字图像相关图像中的偏转图并产生时间平均形状。然后使用基于时间平均形状的举升线理论来计算理论升力和诱导阻力系数，表明膜在负载下的时间平均形状对空气动力学性能有很大贡献。结果表明，将弧度引入到膜翼的框架中可以提高空气动力学效率。

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