| Issue |
La Houille Blanche
Number 7-8, Novembre 1988
|
|
|---|---|---|
| Page(s) | 563 - 570 | |
| DOI | https://doi.org/10.1051/lhb/1988051 | |
| Published online | 01 October 2009 | |
Empreintes dues à l'implosion de bulles isolées : Etude paramétrique expérimentale
Impressions due to the implosion of isolated bubbles: experimental parametric study
1
EDF, DER, Châtou
2
ENSTA, Palaiseau
Abstract
With the aim of gaining a better understanding of the significance of various parameters on the cavitation erosion mechanism, an experimental study has been conducted on the marking of polished materials subjected to the collapse of a vapour bubble engendered by a discharger inside a pressurizable vessel. The parameters studied are: the pressure inside the vessel P, the distance relating to the centre of a (d/Rmax < 1.5) sample bubble, the material (99.99 % aluminium and 316 L stainless steel). Several conclusions can from now on be drawn: * The implosion of a bubble can engender many holes, which demontrates that the collapse in the form of a torus plays a determining part. * The maximum marking is obtained for a d/R value of less than 1.1. * For a given material, there exists a maximum permissible pressure below which no implosion is marked of about 0.07 MPa for aluminium and 0.15 MPa for steel.
© Société Hydrotechnique de France, 1988