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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-356
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
02 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Design, Construction and Commissioning of the Braunschweig Icing Wind Tunnel
Stephan E. Bansmer1, Arne Baumert1, Stephan Sattler1, Inken Knop1, Delphine Leroy2, Alfons Schwarzenboeck2, Tina Jurkat-Witschas3, Christiane Voigt3,4, Hugo Pervier5, and Biagio Esposito6 1Institute of Fluid Mechanics, Technische Universität Braunschweig, Hermann-Blenk-Str. 37, Braunschweig, Germany
2Laboratoire de Météorologie Physique (LaMP), 63178 Aubiere Cedex, France
3German Aerospace Center, Institute of Atmospheric Physics (IPA), Oberpfaffenhofen, 82234 Wessling, Germany
4Johannes Gutenberg-University Mainz, Institute of Atmospheric Physics, 55099 Mainz, Germany
5School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, Beds MK43 0AL, UK
6Italian Aerospace Research Center (CIRA), Via Maiorise, 81043 Capua, Italy
Abstract. Beyond its physical importance in both fundamental and climate research, atmospheric icing is considered as a severe operational condition in many engineering applications like aviation, electrical power transmission and wind-energy production. To reproduce such icing conditions in a laboratory environment, icing wind tunnels are frequently used. Creating and maintaining a stable icing cloud in the tunnel test section yields different design constraints compared to conventional wind tunnels. In this paper, a comprehensive overview on the design, construction and commissioning of the Braunschweig icing wind tunnel is given. The tunnel features a test section of 0.5 m x 0.5 m with peak velocities of up to 40 m/s. The static temperature ranges from −25 °C to +30 °C. Supercooled droplet icing with liquid water contents up to 3 g/m³ can be reproduced. Outstanding ability of the tunnel is to simulate ice crystal icing with natural ice crystals for ice water contents up to 20 g/m³. We further show, how current state-of-the-art measurement techniques for particle sizing perform on ice crystals. The data is compared to those of in-flight measurements in mesoscale convective cloud systems in tropical regions. Finally, some applications of the icing wind tunnel are mentioned.

Citation: Bansmer, S. E., Baumert, A., Sattler, S., Knop, I., Leroy, D., Schwarzenboeck, A., Jurkat-Witschas, T., Voigt, C., Pervier, H., and Esposito, B.: Design, Construction and Commissioning of the Braunschweig Icing Wind Tunnel, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-356, in review, 2017.
Stephan E. Bansmer et al.
Stephan E. Bansmer et al.
Stephan E. Bansmer et al.

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Short summary
Snow, frost formation and ice cubes in our drinks are part of our daily life. But what about our technical innovations like aviation, electrical power transmission and wind-energy production, can they cope with icing? Icing Wind Tunnels are an ideal laboratory environment to answer that question. In this paper, we show how the icing wind tunnel in Braunschweig (Germany) was built and how we can use it for engineering and climate research.
Snow, frost formation and ice cubes in our drinks are part of our daily life. But what about our...
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