Surface Acoustic Wave Sensors and Piezoelectric Actuators for Investigations of Transitional and Turbulent Flows
Quarterly rept. 1 Jul-31 Oct 1989
PENNSYLVANIA STATE UNIV STATE COLLEGE
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The objective of this proposal is to 1 use global and local surface acoustic wave SAW devices as sensors to characterize the spatial and temporal fluctuations of the normal and shear stresses at a wall exposed to turbulent flow 2 study the effect of piezoelectric actuators on the flow field and quantify the changes introduced by characterizing the flow downstream 3 investigate the possibility of using the signals from the sensor to excite the actuators with appropriate feedback loops and signal processing to suppress or eliminate undesirable features in the flow field that lead to increase drag and radiated noise in other words develop a smart skin. Conventional sensors, such as digital imaging with bubble photographs, 3-D LDA and hot wire probes will be used to compare the results from SAW sensors.
- Line, Surface and Bulk Acoustic Wave Devices