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Experimental study of near and far wake generated by a Gurney mini flap in turbulent flow

机译：Gurney小型襟翼在湍流中产生近，远尾流的实验研究

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摘要

This work aims at analyzing the rolling asymmetry of the shear layers downstream of the trailing edge provided with a Gurney flap acting as flow control device to improve airfoil lift in incident turbulent flow. Experimental investigations have been made concerning the vortex flow asymmetry in the near and far wake region, able to distort and change the downwash produced by the airfoil. We conducted experimental studies on the wake at low Reynolds number of an airfoil HQ-17 and a Clark-Y, endowed with Gurney flaps in different configurations regarding the position and the oscillating movement at different frequencies. In order to identify patterns vortices in the airfoil wake a flow behavior is studied until one chord distance downstream. We found experimental evidence that shows two different behaviors in the airfoil wake. Near the trailing edge which shows a typical condition supporting a process of the upper and lower vortices formation quite evident behavior. Larger vortex is generated in the pressure zone and lower vortex in the suction zone. Aspects of the mechanism which connects the different evolution and pattern of these initial vortex structures with increased lift due to the presence of the Gurney flap is presented. Furthermore experimental evidence in the distant wake is found, that downwash increase in the case of the Gurney flap acting as an active flow control element compared to the fixed Gurney. It is also important that changes in the wake turbulence in different conditions are found.
机译：这项工作旨在分析后缘下游剪切层的滚动不对称性，该剪切层设有格尼襟翼，作为流量控制装置，以改善入射湍流中的翼型提升。已经进行了关于近尾流区域和远尾流区域的涡流不对称性的实验研究，涡流不对称性能够使翼型产生的下冲变形并改变。我们对机翼HQ-17和Clark-Y在低雷诺数时的尾流进行了实验研究，该机翼具有不同构型的格尼襟翼，以关于不同频率的位置和振荡运动。为了识别翼型尾流中的旋涡，研究了一种流动行为，直到下游一个弦距离为止。我们发现实验证据表明机翼尾流有两种不同的行为。在后缘附近，这显示了支持上下涡流形成过程的典型条件，行为十分明显。在压力区产生较大的涡流，在吸入区产生较低的涡流。提出了由于格尼襟翼的存在而将这些初始涡旋结构的不同演化和模式与提升力联系起来的机制的各个方面。此外，在远处的尾流中发现了实验证据，与固定式格尼相比，格尼襟翼充当主动流量控制元件的情况下，下冲水量增加。发现不同条件下尾流的变化也很重要。

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  • 来源
    《34th Wind energy symposium 2016》|2016年|108-119|共12页
  • 会议地点 San Diego CA(US)
  • 作者

    Juan Sebastian Delnero; Julio Maranon Di Leo; Mariano Garcia Sainz;

  • 作者单位

    LaCLyFA, Departamento Aeronautica, Facultad de Ingenieria, Universidad Nacional de La Plata, Buenos Aires, Argentina, 1900;

    LaCLyFA, Departamento Aeronautica, Facultad de Ingenieria, Universidad Nacional de La Plata, Buenos Aires, Argentina, 1900;

    LaCLyFA, Departamento Aeronautica, Facultad de Ingenieria, Universidad Nacional de La Plata, Buenos Aires, Argentina, 1900;

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