Use of piezoelectric foil for flow diagnosticsA laboratory investigation was conducted to characterize two piezoelectric-film sensor configurations, a rigidly mounted sensor and a sensor mounted over an air cavity. The sensors are evaluated for sensitivity and frequency response, and methods to optimize data are presented. The cavity-mounted sensor exhibited a superior frequency response and was more sensitive to normal pressure fluctuations and less sensitive to vibrations through the structure. Both configurations were sensitive to large-scale structural vibrations. Flight-test data are shown for cavity-mounted sensors, illustrating practical aspects to consider when designing sensors for application in such harsh environments. The relation of the data to skin friction and maximum shear stress, transition detection, and turbulent viscous layers is derived through analysis of the flight data.
Document ID
19900041254
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Carraway, Debra L. (NASA Langley Research Center Hampton, VA, United States)
Bertelrud, Arild (High Technology Corp. Hampton, VA, United States)