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Analysis of Passive Wake Mixing Techniques Using Time Resolved Digital Particle Image Velocimetry

[+] Author Affiliations
Christopher Weiland, Christopher Michie, Pavlos Vlachos

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. FEDSM2008-55209, pp. 1071-1078; 8 pages
doi:10.1115/FEDSM2008-55209
From:
  • ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
  • Volume 1: Symposia, Parts A and B
  • Jacksonville, Florida, USA, August 10–14, 2008
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4840-1 | eISBN: 0-7918-3832-3
  • Copyright © 2008 by ASME

abstract

Wake mixing is a common flow control technique that can be used in a multitude of applications to disrupt undesired flow structures. A Time Resolved Digital Particle Image Velocimetry (TRDPIV) experiment was performed to analyze the wake mixing properties of flow control approaches in the wake of a flat plate. Triangular winglet-type vortex generators, two lobed trailing edge geometries, and trailing edge blowing are examined and quantitative comparisons of their passive wake mixing properties are compared. The TRDPIV fields were analyzed using the Proper Orthogonal Decomposition as a metric for deducing wake coherency. Results indicate that the airfoil geometry plays a significant role in decreasing wake coherency. Additionally, the eigenmodes of the lobed geometries revealed the greatest differences in the dynamics of the flow between the low and high Reynolds number flows. This suggests these geometries are sensitive to the character of the boundary layer incident on the passive flow control devices.

Copyright © 2008 by ASME

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