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Physics of Fluids / Volume 24 / Issue 2 / ARTICLES / Instability and Transition

Phys. Fluids 24, 024104 (2012); http://dx.doi.org/10.1063/1.3682377 (14 pages)

The three-dimensional transition stages over the NACA-0009 airfoil at Reynolds numbers of several ten thousand

Y. Elimelech, R. Arieli, and G. Iosilevskii

Faculty of Aerospace Engineering, Technion–Israel Institute of Technology, 32000 Haifa, Israel

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(Received 16 February 2011; accepted 13 January 2012; published online 14 February 2012)

This experimental study addresses late transition stages over a conventional airfoil at Reynolds numbers of several ten thousands. The study is based on extensive volumetric flow measurements using constant temperature anemometry. This technique provided both the time-averaged description of the flow field in the vicinity of the wing and the high fidelity spectral analysis inside the separated boundary layer. Large cellular flow structures were observed above the wing. They resemble the stall cells at Reynolds numbers of a few hundred thousands and separation cells at Reynolds numbers of a few hundred. It is shown that most of the energy of the velocity fluctuations within the boundary layer over the forward half of the wing is concentrated in the low-frequency range of the spectrum, where the chord-based Strouhal number is small as compared with unity.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
    1. The constant temperature anemometry technique
    2. Data acquisition and post processing techniques
    3. Experimental hardware
  3. RESULTS
    1. Cellular flow patterns
    2. Velocity profiles
  4. DISCUSSION
    1. The two-dimensional reference flow field
    2. Cellular structures
    3. Growth rate
    4. Low-frequency amplification
  5. CONCLUSIONS

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KEYWORDS, PACS, and IPC

Keywords

aerospace components, anemometry, boundary layer turbulence, flow separation, flow visualisation, fluctuations

PACS

International Patent Classification (IPC)

  • F15D

    Fluid dynamics, i.e. methods or means for influencing the flow of gases or liquids

  • B64C

    Aeroplanes; Helicopters

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3682377

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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