The digital image processing techniques of particle tracking velocimetry (PTV) have been developed rapidly, because they can realize the real-time and contact-free measurement of instantaneous two- or three-dimensional velocity fields. The measurement accuracy by these techniques is still insufficient. In the present study a new simplified double-check method is proposed to correct mismatched particle pairs which are found in the results of velocity vectors when applying a cross-correlation method. As a result, almost all mismatched particle pairs are replaced by correct ones, and the accuracy of the velocity field measurement can be improved. Some suggestions are given as to proper particle size and particle distribution density.
|Transactions of the Japan Society of Mechanical Engineers Series B
|Published - 1991
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