Development of interferometric techniques for nuclei size measurement in cavitation tunnel
Résumé
The knowledge of the nuclei content is essential in naval hydrodynamics for cavitation inception prediction on propellers and hydrofoils. As a matter of fact, tip vortex cavitation which is, generally, the first cavitation to occur on foils or propellers, is very sensitive to the nuclei content. Typically, the nuclei we are looking at, are tiny bubbles which sizes range from 1µm up to 100µm.
Two different types of techniques are generally used: optical techniques that measure the nuclei size and Venturi techniques which measure the critical pressure of the nuclei.
We present here developments of two new optical techniques: the digital in-line holography technique and the Interferometric Laser Imaging Technique based on the PIV optical arrangement. Both techniques have been implemented in the French Large Cavitation Tunnel so called GTH and comparative measurements have been done with CSM technique.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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