Abstract:

A novel method was proposed based on the binocular vision and the particle image gray difference(PIGD) method to measure simultaneously the particle velocity field and the particle size distribution in the liquid spray. The corresponding measuring hardware platform was built, the software system was developed, and the preliminary validating experiments were performed. Two digital cameras were used to capture the flow field of the spray at different shooting angles. The spray particle velocity field was measured by the self-correlation technique. The spray particle size distribution was calculated by PIGD method. The whole measuring system was tested on the simulative and experimental data. The validation results showed that the velocity direction ambiguity can be resolved by this method and the particle velocity and size distribution can be measured accurately.

Key words: velocity measurement, particle size measurement, particle image velocimetry(PIV), particle image gray difference(PIGD) method