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首页> 外文期刊>Journal of visualization >Experimental study of square riblets effects on delta wing using smoke visualization and force measurement
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Experimental study of square riblets effects on delta wing using smoke visualization and force measurement

机译：烟雾可视化和力测量对方肋对三角翼影响的实验研究

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摘要

Riblets are effective approach to improve the aerodynamic performance of low speed wing configurations. For a delta type wing, it is important to alleviate the flow features such as large rollup and tip vortices in low Reynolds number. In this paper, for first time, the effect of the square riblets on delta wings is studied. In the first step, flow visualization is accomplished to find out the effects of riblets on the flow pattern. For this purpose, two slender delta wings with and without riblet are examined in a vertical wind tunnel in which smoke stream lines are passed over the delta wings to visualize the flow pattern. The visualization tests are performed at five angles of attack; i.e., 0, 10, 20, 30 and 35 degrees. The results of flow visualization indicate that considerable improvements are obtained because of delaying flow separation at high attack angles. In the second step, the aerodynamic performance of the two delta wings are quantitatively evaluated by measuring the lift and drag forces using two load cells in another wind tunnel. The force tests are performed at attack angles of 5–65 degrees with 5-degree step sizes. The measured forces show that the riblets decreases the drag coefficient for all attack angles and increase the lift to drag ratio more than 12 percent for 5–20 degrees attack angles. Graphical Abstract.
机译：铆钉是提高低速机翼配置的空气动力学性能的有效方法。对于三角型机翼，重要的是减轻低雷诺数的流动特征，例如大的上翻和尖端涡旋。在本文中，首次研究了方形肋骨对三角翼的影响。第一步，完成流动可视化，以发现肋条对流动模式的影响。为此，在垂直风洞中检查了两个带肋和不带肋的细长三角翼，其中烟流穿过三角翼以可视化流动模式。可视化测试是在五个攻角下进行的。即0、10、20、30和35度。流动可视化的结果表明，由于在高攻角下延迟了流动分离，因此获得了相当大的改进。在第二步中，通过使用另一个风洞中的两个称重传感器测量升力和阻力，来定量评估两个三角翼的空气动力性能。力测试是在5–65度的攻角下以5度的步长进行的。测得的力表明，在5-20度的迎角下，肋条降低了所有迎角的阻力系数，并使升阻比提高了12％以上。图形概要。

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