Three-dimensional vortex interactions with a stationary blade
Three-dimensional vortex interactions with a stationary blade
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三维涡旋与固定叶片的相互作用
DOI：
10.1017/s0001924000064216
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Galbraith
中科院分区：
文献类型：
--
作者：
C. Doolan;F. Coton;R. Galbraith
摘要在与NACA 0015翼型的三维涡干扰过程中，获得了表面压力的测量结果。叶片上下表面承受不同的气动载荷，这似乎是由涡轴向核心流对叶片表面的冲击所控制的。在叶片上表面，涡核流动远离翼型，相互作用表现为吸力峰的产生。在轴向部件朝向叶片的下表面，形成了一个压力脉冲，并且似乎受到涡进近角的影响。这些特点导致了在相互作用过程中法向力和四分之一弦俯仰力矩的快速变化。叶片的这种脉冲加载可能会为直升机尾旋翼的声音产生和控制退化问题提供一些解释。
Abstract Surface pressure measurements were obtained during a three-dimensional vortex interaction with a NACA 0015 aerofoil. The upper and lower surfaces of the blade experienced different aerodynamic loads which appear to be controlled by the impact of the vortex axial core flow on the blade surface. On the upper surface of the blade, where the vortex core flow was away from the aerofoil, the interaction was characterised by the generation of a suction peak. On the lower surface, where the axial component was towards the blade, a pressure pulse developed and seemed to be influenced by the vortex approach angle. These features resulted in rapid changes in normal force and quarter chord pitching moment during the interaction. This impulsive loading of the blade may provide some explanation for sound generation and control degradation problems associated with the tail rotor of helicopters.