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Monitoring the flow features over wind turbine blades is a challenging taskthat has become more and more crucial. This paper is devoted to demonstrate theability of the e-TellTale sensor to detect the flow separation/reattachmentdynamics over wind turbine blades. This sensor is made of a strip with a straingauge sensor at its base. The velocity field was acquired using TR- PIVmeasurements over an oscillating thick blade section equipped with ane-TellTale sensor. PIV images were post-processed to detect movements of thestrip, which was compared to movements of flow. Results show good agreementbetween the measured velocity field and movements of the strip regarding theseparation/reattachment dynamics.

Ability of the e-TellTale sensor to detect flow features over wind turbine blades: flow separation/reattachment dynamics