Surface Acoustic Wave Sensors and Piezoelectric Actuators for Investigations of Transitional and Turbulent Flows

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1989
Accession Number
ADA214889

Entities

People

  • Vasundara V. Vardan
  • Vijay K. Varadan
  • Wayne R. Pauley

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Waves
  • Actuators
  • Air Flow
  • Boundary Layer
  • Delay Lines
  • Flow
  • Flow Fields
  • Leading Edges
  • Measurement
  • Phase Shift
  • Shear Stresses
  • Signal Processing
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Turbulent Flow
  • Waves
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Image Processing and Computer Vision.
  • Robotics and Automation.