Abstract
The three-dimensional particle tracking velocimeter (3-D PTV) is a powerful measurement technique which provides information on all three components of instantaneous velocity in a large space. However, there still remain several problems in the 3-D PTV; in particular, its application to air flow measurement is an urgent requirement in practical use. In this study, the 3-D PTV was applied to the measurement of a turbulent air flow in a duct of square cross-section. As a result, detailed distributions of the mean and fluctuating velocities were measured.
