The flow field around the rotor in ground effect has been studied using flow visualization and hot-wire anemometry. Two distinctive flow phenomena, recirculation and ground vortex, are observed in the flow visualization. Hot-wire measurement results indicates high intensity of unsteadiness of the flow field with long time scale. The evolution of the ground vortex is better understood from the experimental results. Three different types of velocity fluctuations are observed around the ground vortex.
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