Numéro : 1984 - Year : 1985

Study of cavitating flows around axisymetric troncated-rear bodies, including gravity effect

J.L.REBOUD, Centre de recherche et d’essais de machines hydrauliques de Grenoble
A.ROWE, Centre de recherche et d’essais de machines hydrauliques de Grenoble
H.LEMONNIER, Centre d’étude nucléaire de Grenoble

Cavitating flows around axisymetric bodies are studied with a non-linear model, based of surface singularity distributions. The method we use consists in applying a gradient minimisation procedure, to a mixed surface distribution of sources and vortices on elements in shape of troncated cones. The adaptability of such a method allows to take into consideration, simultaneously the head and rear-cavities, including gravity effect. In spite of its instationary and diphasic nature, the cavities closure area is modelised by a displacement thickness ; the many different possibilities this method gives justifies its use, particularly for the study of average pressures.

The comparison between what the mode! provides and experimental measurements is good : the mode! seems to be realistic and the computed pressure distributions can be considered as valid.

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