The turbulent character of the supersonic wake of a linear cascade of fan airfoils has been studied using a two–component Laser Doppler Anemometer. The cascade was tested in the Virginia Polytechnic Institute and State University intermittent wind tunnel facility, where the Mach and Reynolds numbers were 2.36 and 4.8 × 106, respectively. In addition to mean flow measurements, Reynolds normal and shear stresses were measured as functions of cascade incidence angle and streamwise locations spanning the near–wake and the far–wake. The extremities of profiles of both the mean and turbulent wake properties were found to be strongly influenced by upstream shock–boundary–layer–interactions, the strength of which varied with cascade incidence. In contrast, the peak levels of turbulence properties within the shear layer were found to be largely independent of incidence, and could be characterized in terms of the streamwise position only. The velocity defect turbulence level was found to be 23%, and the generally–accepted value of the turbulence structural coefficient of 0.30 was found to be valid for this flow. The degree of similarity of the mean flow wake profiles was established, and those profiles demonstrating the most similarity were found to approach a state of equilibrium between the mean and turbulent properties. In general, this wake flow may be described as a classical free shear flow, upon which the influence of upstream shock–boundary–layer–interactions has been superimposed.
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ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
May 24–27, 1993
Cincinnati, Ohio, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7892-7
PROCEEDINGS PAPER
Turbulence Characteristics in a Supersonic Cascade Wake Flow Free
Philip L. Andrew,
Philip L. Andrew
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Wing-fai Ng
Wing-fai Ng
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Philip L. Andrew
Virginia Polytechnic Institute and State University, Blacksburg, VA
Wing-fai Ng
Virginia Polytechnic Institute and State University, Blacksburg, VA
Paper No:
93-GT-348, V03CT17A009; 13 pages
Published Online:
February 25, 2015
Citation
Andrew, PL, & Ng, W. "Turbulence Characteristics in a Supersonic Cascade Wake Flow." Proceedings of the ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. Volume 3C: General. Cincinnati, Ohio, USA. May 24–27, 1993. V03CT17A009. ASME. https://doi.org/10.1115/93-GT-348
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