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Fluids 2017, 2(2), 23; doi:10.3390/fluids2020023

A Computational Simulation Study of Fluid Mechanics of Low-Speed Wind Tunnel Contractions

1
Center for Measurement Standard, Industrial Technology Research Institute, No. 195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu 31040, Taiwan
2
Intelligent Machinery Technology Center, Industrial Technology Research Institute, No. 195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu 31040, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Meir Teitel
Received: 6 March 2017 / Revised: 26 April 2017 / Accepted: 2 May 2017 / Published: 11 May 2017
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Abstract

In this work, the fluid mechanics performance of four different contraction wall shapes has been studied and compared side-by-side by computational simulation, and the effect of contraction cross-sectional shape on the flow uniformity at the contraction exit has been included as well. A different contraction wall shape could result in up to an extra 4% pressure drop of a closed-loop wind tunnel, and the contraction wall shape has a stronger influence on the pressure loss than the contraction cross-sectional shape. The first and the second derivatives from different wall shape equations could provide a hint for qualitatively comparing the flow uniformity at the contraction exits. A wind tunnel contraction with an octagonal shape provides not only better fluid mechanics performance than that with a circular or a square cross-sectional shape, but also lower manufacturing costs. Moreover, a smaller blockage ratio within the test section can be achieved by employing an octagonal cross-sectional shape instead of a circular cross-sectional shape under the same hydraulic diameter circumstance. A wind tunnel contraction with an octagonal cross-sectional shape is recommended to be a design candidate. View Full-Text
Keywords: wind tunnel contraction; contraction wall shape; contraction cross-sectional shape; computational fluid dynamics wind tunnel contraction; contraction wall shape; contraction cross-sectional shape; computational fluid dynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kao, Y.-H.; Jiang, Z.-W.; Fang, S.-C. A Computational Simulation Study of Fluid Mechanics of Low-Speed Wind Tunnel Contractions. Fluids 2017, 2, 23.

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