Flow above natural and ventilated cavities
Book
·
OSTI ID:94462
- Institute National Polytechnique de Grenoble, St. Martin d`Heres (France). Centre de Recherches et d`Essais de Machines Hydrauliques de Grenoble
- Societe Europeenne de Propulsion, Vernon (France)
This paper presents an experimental study of velocities and turbulent fluctuations, around two-dimensional vapor cavities in water. A Laser-Doppler Velocimeter was used above and in the wake of natural or ventilated cavities, attached to a ridge of the water tunnel. On the first half of the cavity, the boundary layer developing before the cavity, is convected above the interface and diffused. On the second half and in the wake, a large velocity defect and high level of fluctuations, created by the cavity itself, are observed. The effect of velocity and cavity length are investigated, whereas the suppression of mass transfer (ventilated cavity) only influence the results in the wake. The cavity deduced from an image processing technique show that the lowest measurement points are located in a two-phase flow medium, so that streamlines deduced from the velocities are not representative of the mass flow rate distribution. Further measurements are expected to give the mass flow rate towards the cavity.
- OSTI ID:
- 94462
- Report Number(s):
- CONF-940659--; ISBN 0-7918-1377-6
- Country of Publication:
- United States
- Language:
- English
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