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HELICOPTER-OBSTACLE AERODYNAMIC INTERACTION IN WINDY CONDITIONS

机译:大风条件下的直升机 - 障碍空气动力学相互作用

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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:直升机 - 障碍互动在过去几年中已成为一个具有挑战性的研究课题。在这种空气动力学相互作用中可能出现的有害效果可以在刮风的条件下显着恶化,特别是当直升机在湍流内飞在湍流内和由障碍物产生的极其不稳定的唤醒内时。在本文中,描述了通过将直升机模型在多个位置处的障碍物,在刮风方面,通过将直升机模型放置在多个位置,在有刮风方面,通过将直升机模型放置在多个位置。实验数据库包括在转子上的负载测量,以便在转子和转子之间的区域中的障碍物和粒子图像速度(PIV)测量上的立方体障碍,稳定和不稳定的压力测量来评估不同位置的转子性能。障碍物以突出互动流场的特征。

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