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Experiments in Fluids

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01-08-2016 | Research Article

Active control of crossflow-induced transition by means of in-line pneumatic actuator orifices

Authors: J. Lohse, H. P. Barth, W. Nitsche

Published in: Experiments in Fluids | Issue 8/2016

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Abstract

The possibility of a pneumatic actuator system for controlling the crossflow vortex-induced laminar breakdown is investigated by means of hot-wire measurements. Steady blowing or suction through a spanwise row of periodically arranged orifices initiates a system of longitudinal vortices which reduces the amplitude of the most amplified stationary crossflow vortices. Thus, the onset of high-frequency secondary instability and the following laminar–turbulent transition was shifted farther downstream. All experiments were conducted at the redesigned DLR swept flat plate experiment in the open test section of the 1 m wind tunnel at the DLR in Göttingen.

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Title: Active control of crossflow-induced transition by means of in-line pneumatic actuator orifices
Authors: J. Lohse
H. P. Barth
W. Nitsche
Publication date: 01-08-2016
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 8/2016
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-016-2213-x

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