Association Technique Maritime et Aéronautique

Numéro : 2046 - Year : 1987

Aspects of propeller flow modelling

C.PELLONE, Chargé de Recherche au CNRS,
A.ROWE, Directeur, Centre de Recherches et d'Essais de Machines Hydrauliques de Grenoble


Propeller flow modification based upon the singularity method is a complex problem for the following reasons, e.g. : unsteady flow, non rotational hypothesis, cavitation, strong interaction due to complexity of geometry, Joukowski condition, wake effect. Emphasizing in this paper the solution of some of these difficulties, the following points are treated :

identification of the form geometry and grid-mesh optimisation a method is presented whicr1 permits to calculate the section thickness and camber-line laws from a given number of points, and which in a second stage optimises the mesh .

-the problem of blade thickness and the Joukowski condition : non lineal methods are presented permitting to calculate potential flow around thin propeller blades. A rigorous solution of the non-linear Joukowski condition is given.

-the cavitation problem : a comparative study of different flow models used for partial cavitation problems, is presented.

-wake modelisation effects : the wake is simplified by an helicoldal surface. Systematic variation of the pitch angle shows the importance of the wake geometry on the thrust and torque coefficient. Comparison between experimental and calculated data shows a good agreement.

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