Abstract
The traditional method of generating turbulence in a wind tunnel is by the insertion of mechanical grids into the air flow. The major drawback are the rather small achiveable Reynolds numbers caused by low turbulence intensities of typically less than 5%. Another rather new aproach to generate turbulence is to use a so called active grid, first developed and realized by Makita in 1991 1. In contrast to conventional grids it consists of several horizontal and vertical axes with surmounted flaps, that can separately and independently be moved by electrical drives. Based on his pioneering work and subsequent developments we developed a similar active grid for our wind tunnel. In our work we focus on the influence of different driving signals on the generated turbulence.
The wind tunnel is a closed loop section tunnel with a cross section of 1.10 by 0.80 m2, that can be operated with a closed or an open (Goettingen style) test section. At open section, the test section length is 1.80 m and 2.70 m at closed section. The maximum wind speed of the free flow is 50 m/s.
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© 2009 Springer-Verlag Berlin Heidelberg
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Knebel, P., Peinke, J. (2009). Active grid generated turbulence. In: Eckhardt, B. (eds) Advances in Turbulence XII. Springer Proceedings in Physics, vol 132. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03085-7_219
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DOI: https://doi.org/10.1007/978-3-642-03085-7_219
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03084-0
Online ISBN: 978-3-642-03085-7
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