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Hovering of a passive body in an oscillating airflow
2006
Physics of Fluids
Small flexible bodies are observed to hover in an oscillating air column. The air is driven by a large speaker at frequencies in the range 10-65 Hz at amplitudes 1 -5 cm. The bodies are made of stiffened tissue paper, bent to form an array of four wings, symmetric about a vertical axis. The flapping of the wings, driven by the oscillating flow, leads to stable hovering. The hovering position of the body is unstable under free fall in the absence of the airflow. Measurements of the minimum flow
doi:10.1063/1.2371123
fatcat:xbw565cmvvacljbpb7ml3sbism