Summary
The spatial and temporal development of artificially excited instability waves in a laminar boundary layer on a flat plate is investigated by means of the PVDF foil measuring technique. Compared to a simple exploitation of the piezoelectric effect, the signal to noise ratio can be improved considerably when deliberately exploiting the pyroelectric effect by means of an integrated surface heating device. In this context, the present paper describes simultaneously recorded measurements, employing a total number of 142 wall sensors, allowing to detect traveling instability waves of small amplitude. In order to illustrate the flow phenomena investigated, the obtained results are visualized in space and time.
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Abbreviations
- RMS:
-
root mean square
- x, y, z:
-
coordinates
- F:
-
frequency parameter
- f:
-
frequency
- λ:
-
wavelength
- U∞ :
-
freestream velocity
- Re:
-
Reynolds number
- Reδ1 :
-
displacement thickness Reynolds number
- u’:
-
streamwise velocity fluctuation
- Tu:
-
turbulence intensity
- Q:
-
electric charge
- ΔT:
-
temperature gradient pressure
- SSensor :
-
surface area of single sensor
- dt :
-
pyroelectric coefficient
- d33 :
-
piezoelectric coefficient
- λ*:
-
POD eigenvalue
- PVDF:
-
Polyvinylidenfluorid (polarized plastic film)
- CTA:
-
constant temperature anemometer
References
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Brauckhoff, R.; Nitsche, W.: Flächige Messung periodisch-instationärer Oberflächendrücke an einem hydraulischen Strömungsgitter mit Hilfe piezoelektrischer Sensorarrays, Forschung im Ingenieurwesen — Engineering Research Bd. 60 (1994) Nr. 11/12, 323 – 331.
Tichý, J.; Gautschi, G.: Piezoelektrische Meßtechnik, Springer-Verlag, Berlin Heidelberg New York,1980.
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Sturzebecher, D.: Untersuchungen zum laminar-turbulenten Strömungsumschlag an einer ebenen Platte mit Temperaturgradient zwischen Struktur und Strömung, Diplomarbeit,TU Berlin, 1996.
Hilberg, D.; Lazik, W.; Fiedler, H.E.: The Application of classical POD and Snapshot POD in a Turbulent Shear Layer with Periodic Structures, Applied Scientific Research 53: 283–290, 1994, Kluwer Academic Publishers
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© 1997 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden
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Sturzebecher, D., Nitsche, W. (1997). Visualization of the Spatial-Temporal Instability Wave Development in a Laminar Boundary Layer by Means of a Heated PVDF Sensor Array. In: Körner, H., Hilbig, R. (eds) New Results in Numerical and Experimental Fluid Mechanics. Notes on Numerical Fluid Mechanics (NNFM), vol 60. Vieweg+Teubner Verlag, Wiesbaden. https://doi.org/10.1007/978-3-322-86573-1_43
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DOI: https://doi.org/10.1007/978-3-322-86573-1_43
Publisher Name: Vieweg+Teubner Verlag, Wiesbaden
Print ISBN: 978-3-322-86575-5
Online ISBN: 978-3-322-86573-1
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