REVIEW OF TURNING VANES, CURVED DIFFUSERS AND THEIR ROLE IN COMPACT WIND AND WATER TUNNELS

Alexander BARON von HOHENHAU, Vasile NĂSUI

Abstract


Turning vanes and curved diffusers are an integral part of many modern wind and water tunnels. They facilitate the turning of flow around tight bends, increasing flow uniformity while reducing energy losses and turbulence. Ample literature exists discussing these flow conditioners, but the information is scattered. This necessitates a novel overview of the developments since the first closed circuit wind tunnel was constructed in 1909. Particular attention is paid to modern expansion vanes, which allow for the construction of more compact research facilities. A quantitative meta-analysis of pressure loss coefficients will illustrate the real-world benefits of using specific turning vanes. The best performance is achieved by the vanes developed at KTH and MIT for standard and expanding corners, respectively.

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References


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