Local field correction PIV: on the increase of accuracy of digital PIV systems

摘要: Cross-correlation Particle Image Velocimetry (PIV) has become a well known and widely used experimental technique. It been already documented that difficulties arise resolving velocity structures smaller than the interrogation window. This is caused by signal averaging over this A new cross-correlation PIV method eliminates restriction presented. The brings some other enhancements, such as ability to deal with large gradients, seeding density inhomogeneities, high dispersion in brightness of particles. final result remarkable capability for accurately small scale flow, down few times mean distance between When compared particle tracking velocimetry, capable obtaining measurements at concentrations. Therefore, better overall performance obtained, especially limited resolutions video CCDs. In paper, described its evaluated traditional systems using synthetic images. Application real data are included results discussed.