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Low-Speed Aerodynamic Characteristics of Supercritical Airfoil with Small High-Lift Devices from Flow Pattern Measurements

机译:流量模式测量小型高升力装置的超临界翼型的低速空气动力学特性

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In this paper, the lift coefficients of SC-0414 airfoil are estimated by applying modified Yamana’s method to the flow visualization results, which are obtained by utilizing the smoke tunnel. The application of the modified Yamana’s method is evaluated with two calculation methods. Additionally, the lift estimation, wake measurements, and numerical simulations are performed to clarify the low-speed aerodynamic characteristics of the SC airfoil with flaps. The angle of attack was varied from −5° to 8°. The flow velocity was 12 m/s and the Reynolds number was 1.6 × 105. As a result, the estimated lift coefficients show a good agreement with the results from reference data and numerical simulations. In clean condition, the lift coefficients calculated from the two methods show quantitative agreement, and no significant difference could be confirmed. However, the slope of the lifts calculated from ys is higher and closer to the reference data than those obtained from sc, where ys denotes the height where the distance from the streamline to the reference line is the largest, and sc denotes the displacement of the center of pressure from the origin of the coordinate, respectively. In the case of flaps, the GFs have an observable effect on the aerodynamic performance of the SC-0414 airfoil. When the height of the flap was increased, the lift and drag coefficients increased. The installation of a GF with a height equal to 1% of the chord length of the airfoil significantly improved the low-speed aerodynamic performance of SC airfoils.
机译:在本文中,通过利用烟雾隧道将改性的yamana的方法应用于流动可视化结果来估计SC-0414翼型的提升系数。用两种计算方法评估改进的Yamana方法的应用。另外,执行升力估计,唤醒测量和数值模拟,以阐明具有襟翼的SC翼型的低速空气动力学特性。攻角从-5°到8°变化。流速为12米/秒,雷诺数为1.6×105.结果,估计的提升系数与来自参考数据和数值模拟的结果吻合良好。在清洁条件下,由两种方法计算的升力系数显示定量协议,并且可以确认没有显着差异。然而,从ys计算的升降的斜率比从sc获得的斜率更高且更接近参考数据,其中ys表示从流线到参考线的流线的距离是最大的,并且sc表示距离的距离分别来自坐标原点的压力中心。在襟翼的情况下,GFS对SC-0414翼型的空气动力学性能具有可观察的影响。当襟翼的高度增加时,提升和拖动系数增加。高度等于翼型的高度等于1%的GF的安装显着提高了SC翼型的低速空气动力学性能。

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