Abstract
Many methods of particle tracking velocimetry (PTV) have been proposed for measuring three-dimensional (3-D) steady and unsteady flows. However, in these methods setting conditions of cameras and applying to 3-D flows are rather difficult. A novel measurement method of 3-D flow velocity is proposed in this study to overcome the difficulties. A marked square is taken in pictures from 2 directions together with flowing tracers. The configurations of two cameras and the position of each tracer can be determined through descriptive geometry by referring to the square. To examine the validity of this method, three types of measurements are conducted. First, the positions of the vertexes of stationary rectangular prisms are determined. Second, the motions of balls rolling down on an inclined plate are measured. Third, the 3-D motions of tracers around a small fan are measured.
