Abstract
An improved Particle Tacking velocimetry (PTV) algorithm was proposed in the present paper. The path tracking of the traced particle was achieved through a recursive cross-correlation operation of small interrogation window around the studied particles at two time steps. The particles are tracked by using grid points velocities calculated by the recursive cross-correlation method. To reduce the tracking error, a variable interrogation window size setting which changed with the interrogation window size according with spatial density of particles was introduced to the recursive cross-correlation method. The performance of the improved algorithm is evaluated by the synthetic particle images.
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