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Beitrag zur hochbelasteten Schaufelgrenzschicht
Citation key lou_diss_2000_en
Author Weiliang Lou
Year 2000
ISBN 978-3-18-339507-1
Location Düsseldorf
Publisher VDI-Verlag
Series Fortschritt-Berichte VDI
Edition Reihe 7
School Technische Universität Berlin
Abstract Based on an experimental investigation carried out in a low speed test facility at the Berlin University of Technology, this thesis describes the high loaded boundary layers with a separation bubble under steady and periodic-unsteady main flow conditions. The aim of the investigation was to understand the mechanism of separation, transition and reattachment and the effect of main flow unsteadiness on it. The high loaded boundary layers for various main flow conditions were simulated over a large flat plate, which experienced a similar pressure distribution to that on the suction surface of blades in turbomachines. The pressure distribution was generated by a contoured wall opposite the plate. Aimed at separating the effect of the velocity and the turbulence wake, this paper considers only the influence of the velocity wake. To this effect, a rotating flap was mounted downstream of the test section to produce periodic oscillations of the main flow. The overall flow field under steady main flow conditions was obtained by hot-wire measurements. Pressure taps were used to measure the pressure distribution over the plate. The following conclusions may be drawn from the experimental results for steady and periodic-unsteady boundary layers with separation bubble.
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