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Conference Papers Year : 2020

Monitoring by integrated piezo sensors of a turbine blade submitted to cavitation

Philippe Guy
Thomas Monnier


With the integration of a growing share of renewable energies, the energy sector is undergoing profound changes and in particular the emergence of new issues related to the stability of electricity networks. Hydroelectricity is expected to play a major role in adjusting power generation to demand. However, this use of hydroelectric turbines places a heavy load on the machines. With increased availability requirements and more severe operating modes, the need for monitoring systems is becoming more pressing. It can become a differentiator between turbine manufacturers. The objective of this study is to demonstrate the feasibility of a diagnosis of hydroelectric turbine structures and associated components by ultrasonic guided waves inspection for integration into a structural health monitoring system. The proposed technique consists in using guided waves generated by piezoelectric patches bonded on the structure to be inspected. The exploratory experimental study showed the potential of this technique for detecting cavitation, which is responsible for the premature degradation of turbine blades by material pull-out. A representative sample of a turbine blade was instrumented and placed in a test loop to vary different water flow parameters (temperature, flow velocity, pressure). Three scalar damage indicators were chosen and their evolutions were recorded as the water flow parameters were modified. While two indicators were sensitive to all variations in flow parameters, the third only reacted to the parameter of interest, namely the appearance of cavitation. Possible applications of this approach would be, for example, the monitoring of the condition of turbine blades and the detection of damage such as cracks or pull-outs of materials related to cavitation, corrosion or abrasion, or the monitoring of penstocks.
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hal-03240266 , version 1 (30-05-2021)



Philippe Guy, Thomas Monnier. Monitoring by integrated piezo sensors of a turbine blade submitted to cavitation. Forum Acusticum, Dec 2020, Lyon, France. pp.63-66, ⟨10.48465/fa.2020.0462⟩. ⟨hal-03240266⟩
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