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Influence of Rotation on Dynamic Stall

机译：旋转对动态失速的影响

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摘要

A computational investigation of the effect of rotation on two-dimensional (2D) deep dynamic stall has been undertaken, showing that the effect of rotation is to reduce the severity of the pitching moment peak and cause earlier reattachment of the flow. A generic single blade rotor geometry was investigated, which had a pitching oscillation around the quarter-chord axis while in hover, causing angle-driven dynamic stall. The results at the midpoint of the blade have the same Mach number (0.31), Reynolds number (1.15×10~6), and pitching motion (α = 13°±7°) as a dynamic stall test case for which significant experimental wind tunnel data and 2D computations exist. The rotating blade is compared with 2D computations and computations using the same blade without rotation at Mach 0.31 and with the same pitching motion. All test cases involve geometries propagating into undisturbed flow with no downwash. The three-dimensional (3D) grid computed without rotation had lower lift at the reference section than for a 2D computation with the same geometric angle of attack time history, and the lift overshoot classically observed for Spalart-Allmaras turbulence models during 2D dynamic stall was significantly reduced in the 3D case. Rotation reduced the strength of the dynamic stall vortex, which reduced the accompanying pitching moment peak by 25%.
机译：已经进行了对旋转对二维（2D）深动态失速的影响的计算研究，结果表明，旋转的影响是降低俯仰力矩峰值的严重性并引起流的早期重新附着。研究了通用的单叶片转子几何形状，该几何形状在悬停时围绕四分之一弦轴有俯仰振荡，从而导致角度驱动的动态失速。叶片中点的结果与动态失速测试用例的马赫数（0.31），雷诺数（1.15×10〜6）和俯仰运动（α= 13°±7°）相同，在这种情况下，实验风很大存在隧道数据和2D计算。将旋转叶片与2D计算进行比较，并使用相同的叶片以0.31马赫不旋转且俯仰运动相同的方式进行计算。所有测试案例都涉及几何图形，这些几何图形传播到无扰动的流中，没有冲洗。与具有相同几何攻角历史的2D计算相比，在不旋转的情况下计算的三维（3D）网格在参考截面处的升力要低，并且在2D动态失速期间经典观察到的Spalart-Allmaras湍流模型的升力过冲为在3D情况下明显减少。旋转降低了动态失速涡旋的强度，从而使伴随的俯仰力矩峰值降低了25％。

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  • 来源
    《Journal of the American Helicopter Society》 |2013年第3期|032001.1-032001.9|共9页
  • 作者

    A. D. Gardner; K. Richter;

  • 作者单位

    Institute of Aerodynamics and Flow Technology German Aerospace Center (DLR) Goettingen, Germany;

    Institute of Aerodynamics and Flow Technology German Aerospace Center (DLR) Goettingen, Germany;

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