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some aspects on unsteady flow past airfoils and cascadesThe unsteady boundary layer due to a gust propagating past an isolated airfoil and on airfoils in cascade was measured with a hot wire anemometer in a low speed gust tunnel. Coherent signals were obtained by a phase lock averaging technique that was implemented in an on-line analysis using a PDP 12 computer. Changes in a boundary layer shape factor, noise level, and pressure gradient were correlated over a complete gust cycle. It is concluded that the character of the boundary layer changes from laminar to turbulent and back to laminar during the course of a gust cycle at certain chordwise positions. These measurements help explain certain anomalies that were observed during a previous study of the pressure fluctuations due to gust loadings on airfoils and cascades.
Document ID
19760018105
Document Type
Conference Paper
Authors
Satyanarayana, B.
(Cambridge Univ.)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Publication Information
Publication: AGARD Unsteady Phenomena in Turbomachinery
Subject Category
AERODYNAMICS
Distribution Limits
Public
Copyright
Other

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