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首页> 外文期刊>International Journal of Aerodynamics >Leading edge vortex development on a pitch-up airfoil
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Leading edge vortex development on a pitch-up airfoil

机译：俯仰翼型上的前沿涡流发展

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摘要

The development of the lift generated by a leading edge vortex (LEV) across a flat plate experiencing a pitch-up motion is investigated to understand the LEV's influence on lift generation. The flow field around the pitch-up plate is simulated by solving the Navier-Stokes equations on composite overlapping grids. The pitch-up angle was from 0 to 45 degrees and the Reynolds number was 500. The Q-criterion method was used to isolate vortex structures from shear layer vortices in order to assess the circulation of the LEV. The calculated circulation due to LEV was then compared to the computed lift from simulation for a better understanding of the effect of the LEV on lift generation. Using the non-circulatory component of Theodorsen's theory, we separate the total lift into lift due to the plate rotation (non-circulatory lift) and lift due to aerodynamic effects (circulatory lift). Our results showed that the non-circulatory force only contributes 10-20% of the total lift and the remaining is due to the LEV. We also found that the LEV growth mainly depends on time but not the angle of attack. However, the circulation strength of the LEV depends on the pitch rate.
机译：研究了由前涡流（LEV）跨过俯仰运动的平板产生的升力的发展过程，以了解LEV对升力产生的影响。通过求解复合重叠网格上的Navier-Stokes方程，可以模拟俯仰板周围的流场。俯仰角为0到45度，雷诺数为500。使用Q准则方法从剪切层涡旋中分离出涡旋结构，以评估LEV的循环。然后将计算出的LEV引起的循环与模拟计算出的升力进行比较，以更好地了解LEV对升力产生的影响。使用Theodorsen理论的非循环分量，我们将总升程分为由于板块旋转而产生的升程（非循环升程）和由于空气动力效应而产生的升程（循环升程）。我们的结果表明，非循环力仅占总升力的10％至20％，其余的归因于LEV。我们还发现LEV的增长主要取决于时间，而不取决于迎角。但是，LEV的循环强度取决于俯仰率。

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