Abstract
Experimental and Numerical Investigation of the Erosive Potential of a Leading Edge Cavity
Highlights
The understanding of the cavitation erosion phenomenon and the prediction of material damage are a major challenge for hydraulic engineers and scientific researchers
These results suggest that the increase in flow aggressiveness is due to an increase in both amplitude and frequency of impact loads, which might explain the strongly non-linear behavior of cavitation erosion damage with flow velocity
A hydrofoil instrumented with PVDF pressure sensors was tested in the LEGI hydrodynamic tunnel under different cavitating conditions in order to estimate cavitation aggressiveness
Summary
The understanding of the cavitation erosion phenomenon and the prediction of material damage are a major challenge for hydraulic engineers and scientific researchers. One of the advantages of this technique is that such a distribution can be applied numerically on the material surface in a repetitive way in order to simulate its response to a long duration exposure to the cavitation field, which will offer the possibility of computing mass loss as a function of exposure time provided a suitable damage model is introduced in the simulation This way of measuring the flow aggressiveness uses the material itself as a kind of pressure sensor. The numerical computation of impact load spectra [9] requires to resolve individual vapour structures and the shock waves induced by their collapse, which is often challenging in terms of computational resources Simpler approaches such as [12] were developed that do not seek to capture the dynamics of the smaller vapour structures responsible for cavitation erosion but are based on the computation of the void fraction field.
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