| Autor: |
Michael Macrorie, Wayne R. Pauley, Vasundara V. Varadan |
| Rok vydání: |
1991 |
| Předmět: |
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| Zdroj: |
The Journal of the Acoustical Society of America. 89:1944-1944 |
| ISSN: |
0001-4966 |
| DOI: |
10.1121/1.2029618 |
| Popis: |
A new technique is being investigated for the direct measurement of surface stresses (both pressure and shear) in Steady and unsteady wall bounded flows. The technique utilizes surface acoustic wave (SAW) devices. A first generation sensor has been used to measure mean wall shear stress beneath a turbulent boundary layer at speeds from 10 to 20 m/s in air. Good agreement with a standard technique was found. To demonstrate the dynamic response, an artificially generated vortex structure was propagated over the SAW sensor. The time dependent pressure and shear stress oscillations due to the passage of the unsteady vortex were measured by the SAW sensor and compared with the response of a hot wire probe. Further reduction in the size of the sensors, multiple sensing elements, and refinement of the calibration technique will produce sensors capable of resolving the full stress vector due to near wall flow structures in transitional and turbulent boundary layers. [Work supported by ONR under Grant No. N00014‐8... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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