Transition of boundary layer flows in the presence of Goertler vortices |
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Authors: | S H Winoto H T Low |
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Institution: | (1) Department of Mechanical and Production Engineering, National University of Singapore, 0511 Kent Ridge, Singapore, Republic of Singapore |
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Abstract: | Transition of boundary layer flows in the presence of longitudinal counter-rotating Goertler vortices was experimentally investigated
on a concave surface of 1.0 m radius of curvature in a perspex (plexiglass) curved rectangular duct connected to a low speed
wind tunnel for a free-stream velocity range of 5.7–11.8 m/s. Quantitative measurements were carried out using a single sensor
hot-wire anemometer, while the boundary layer transitions were detected using frequency spectrum method. The results confirm
that in the presence of Goertler vortices, transition is initiated at the boundary layer upwash regions, and also agree well
with the predicted values obtained using the two existing empirical transition criteria for concave surface boundary layer
flows. |
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Keywords: | |
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