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Abstract
In this study, we focused on the lift generation with a thin rotating plate. The objective of this study is to understand the appropriate shape and the role of vortex for rotating thin plate. We determined the shape of the plate through free-flight tests of paper strips and investigated the aerodynamic characteristics of the rotating plate with the selected shape. The rectangular plate with an aspect ratio 7 was relevant from moment of inertia and bending stress. An endplate on a wing tip increased the stability on the lateral vortex structure behind the rotating plate. Velocity field measurement by Particle Image Velocimetry (PIV) showed that the lift force was generated twice in a rotating cycle.
Highlights
The aerodynamics of freely falling paper plate such as business cards was studied to understand for the fluttering or the tumbling
The influence of the shape of plate and the role of vortex dynamics were investigated, we propose using a rotating plate about its spanwise axis
We conducted numerous flight tests using a model plane to understand the factors influencing the stability of its flight
Summary
The aerodynamics of freely falling paper plate such as business cards was studied to understand for the fluttering or the tumbling. The motion of paper plate during the autorotation is vertically and horizontally. The horizontal motion is not periodic oscillating motion like a swing motion This means that the paper plate has the direction of a horizontal displacement. Mittal et al showed that the paper plate during the autorotation generates the lift force [1]. That if we controlled rotation of paper plate certainly to generate the enough lift force during the autorotation. This might become a small flier such a Micro Air Vehicle (MAV) [2].
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