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首页> 外文会议>International specialists meeting on unmanned rotorcraft 2009 >Numerical Study of the Effects of Leading and Trailing Edge Geometries and Planform on Micro Hovering Rotor
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Numerical Study of the Effects of Leading and Trailing Edge Geometries and Planform on Micro Hovering Rotor

机译：前后缘几何形状和平面形状对微型悬停转子影响的数值研究

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In this work, a compressible Reynolds Averaged Navier Stokes (RANS) code is used to investigate the effects of leading and trailing edge geometries and planform on micro hovering rotor. The current work serves as a step towards using computational methodology to develop a highly efficient micro-scale rotor. The effect of leading and trailing edge geometries is investigated by looking at blunt and sharp profiles and comparing with experimental data. The thrust and power are reasonably well predicted for all the geometries. Blunt leading edge geometries show poorer performance compared to the corresponding sharp leading edge geometries mainly because of large pressure drag acting at the blunt front. Blunt leading edge geometry also shows significant leading edge laminar separation bubble which results in complete separation near the tip. Sharpening the trailing edge shows performance improvement for the blunt leading edge geometry, but not for the sharp leading edge geometry. Flow visualization shows that the tip vortex flow-field is very complicated with the presence of secondary vortices and additional vortices formed due to separation near the trailing edge. Use of twist and taper improves the performance of micro rotor. Twist reduces the induced power, while taper decreases the profile power. Additionally, twist increases the thrust level at which rotor has maximum thrust to power ratio.
机译：在这项工作中，使用可压缩的雷诺平均纳维斯托克斯（RANS）代码来研究前缘和后缘几何形状以及平面形状对微型悬停转子的影响。当前的工作是迈向使用计算方法开发高效微型转子的一步。通过查看钝角和锋利的轮廓并将其与实验数据进行比较，来研究前缘和后缘几何形状的影响。对于所有几何形状都可以很好地预测推力和功率。相较于相应的锋利的前缘几何形状，钝的前缘几何形状表现出较差的性能，这主要是因为作用在钝的前端的压力拖曳较大。钝的前缘几何形状还显示出明显的前缘层流分离气泡，这导致尖端附近的完全分离。锐化后缘显示出钝的前缘几何形状的性能改善，但尖锐的前缘几何形状则没有。流动可视化显示，由于存在次级涡旋以及由于后缘附近的分离而形成的附加涡旋，尖端涡旋流场非常复杂。扭曲和锥度的使用提高了微型转子的性能。扭曲会减小感应功率，而锥度会减小轮廓功率。另外，扭转增加了推力水平，在该推力水平下，转子具有最大推力/功率比。

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