English: Wreckage of a centrifugal pump impeller on account of cavitation. Français: Usure par cavitation d’un impulseur de pompe centrifuge. Deutsch: durch. The following other wikis use this file: Usage on Cavitació. Usage on Cavitation · Utilisateur:Jean-Jacques MILAN – Images. The following other wikis use this file: Usage on Cavitació. Usage on Kavitation. Usage on Kavitacio.
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Have you forgotten your login? Numerical simulation of a mechanical load on a wall resulting from cavitating flows, with application to centrifugal pumps cavitation wear.
Christophe Leclercq 1 Details. Christophe Leclercq 1 AuthorId: The development of cavitation structures can lead to efficiency losses during hydraulic machinery duty. Moreover, cavitation can be responsible for wear of mechanical parts through cavitation erosion.
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The presence of cavitation in a hydraulic machine is also linked to a technical and economical trade-off, because the size and rotational speed of pumps are highly dependent on the acceptable cavitation level.
Therefore, it seems likely that cavitation will remain present in current and future pump designs and its consequences must be dealt with.
The prediction of the erosion is important both for the improvement of hydraulic components at the design stage but also for the optimization of maintenance periods of existing machinery.
Experimental tests can be carried out to characterize the erosion behaviour of a machine, but are still expensive. With the recent advances in Computational Fluid Dynamics, the numerical prediction of cavitation erosion appears as a reachable and cost-effective alternative.
File:Usure par cavitation d’un impulseur de pompe centrifuge jpg – Wikimedia Commons
The erosion is a multi-physical and multi-scale phenomenon. Multi-physical because it deals with both fluid and solid mechanics and multi-scale because the length and time scales of the flow around the hydraulic component 0.
In this thesis, only the fluid part is considered, more particularly, the mechanical load imposed by a cavitating flow on a material, called “cavitation intensity”. The objective is to estimate this intensity from cavitating flow simulations.
Comparisons between 3D simulations on different meshes show that the model provides good qualitative predictions of erosion at different flow velocities. An attempt is made to propose a quantitative validation for the case of the hydrofoil, with promising results.
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In order to enrich the cavitation intensity prediction model, simulations at the bubble scale are also performed. These simulations allow for a better understanding dees the interaction between an incident pressure wave and the implosion of a near-wall bubble.
The mechanism of bubble collapse amplification is simulated, and is shown to be associated with high magnitude pressure waves. This amplification phenomenon is suspected to be a strong contributor to the damage of neighbouring materials. Cavitatiom tentative de validation quantitative pour le cas de l’hydrofoil est mise en place et semble prometteuse.
Cavitation Cavitation intensity prediction Erosion 3D unsteady simulation. Thursday, May 17, – 9: Tuesday, November 27, – 4: Monday, September 24, –