Abstract
W sunlight is admitted through a narrow opening in a darkened room, the dust particles flying in the air and crossing the beam become visible. This phenomenon reproduced in the wind tunnel may be utilized to visualize airflow around an object. Fig. 1 shows a sketch of the arrangement used. In the two opposite sides of a darkened wind tunnel are narrow slots through which parallel beams of light are thrown on the airfoil. Aluminum dust is introduced in the airflow by means of a blower at the opening of the wind tunnel. The camera is mounted on the top of the wind tunnel. A very small amount of light and aluminum powder is necessary to make the flow visible
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