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HELICOPTER-OBSTACLE AERODYNAMIC INTERACTION IN WINDY CONDITIONS

机译:风力条件下的直升机与障碍物气动相互作用

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The helicopter-obstacle interaction has become a challenging research topic in the last few years. The detrimental effects which can arise in this kind of aerodynamic interaction can be dramatically worsened under windy conditions, particularly when the helicopter flies inside the turbulent and extremely unsteady wake generated by an obstacle. In the present paper a comprehensive experimental survey carried out at Politecnico di Milano is described, obtained by placing a helicopter model in several positions with respect to an obstacle, in windy and not windy conditions. The experimental database comprises load measurements on the rotor in order to assess the rotor performance for different positions with respect to a cubic obstacle, steady and unsteady pressure measurements on the obstacle and Particle Image Velocimetry (PIV) measurements in the region between the rotor and the obstacle in order to highlight the features of the interacting flowfield.
机译:在过去的几年中,直升机与障碍物之间的相互作用已成为具有挑战性的研究课题。在有风的条件下,这种空气动力相互作用中可能产生的有害影响会大大恶化,尤其是当直升机在湍流和障碍物产生的极不稳定的尾波中飞行时。在本文中,描述了在米兰理工大学进行的一项全面的实验调查,该实验是通过在有风而不是有风的条件下将直升机模型放置在相对于障碍物的几个位置上而获得的。实验数据库包括转子上的载荷测量值,以便评估相对于立方障碍物的不同位置的转子性能;障碍物上的稳态和非稳态压力测量值;以及转子与转子之间区域中的粒子图像测速(PIV)测量值。为了突出相互作用流场的特征而设置障碍物。

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