A Computational Simulation Study of Fluid Mechanics of Low-Speed Wind Tunnel ContractionsReport as inadecuate


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


A Computational Simulation Study of Fluid Mechanics of Low-Speed Wind Tunnel Contractions - Download this document for free, or read online. Document in PDF available to download.

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

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





Author: Yi-Huan Kao 1,* , Zhou-Wei Jiang 2 and Sheng-Cyuan Fang 1

Source: http://mdpi.com/



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