Modeling of Unsteady Sheet Cavitation on Marine Propeller Blades

Modeling of Unsteady Sheet Cavitation on Marine Propeller Blades

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Unsteady sheet cavitation is very common on marine propulsor blades.The authors summarize a lifting-surface and a surface-panel model to solve for the unsteady cavitating flow around a FIRM HOLD HAIR SPRAY propeller that is subject to nonaxisymmetric inflow.The time-dependent extent and thickness of the cavity were determined by using an iterative method.The cavity detachment was determined by applying the smooth detachment criterion in an iterative manner.

A nonzeroradius developed vortex cavity model was utilized at the tip of the blade, and the trailing wake geometry was determined using a 5 Piece Sectional with Chaise fully unsteady wake-alignment process.Comparisons of predictions by the two models and measurements from several experiments are given.