Abstract
The aerodynamic design of open-circuit wind tunnels, driven by a centrifugal “blower” connected to the settling chamber by a wide-angle diffuser, is discussed. The design or choice of the blower, diffuser and screens is described in detail because of the strong influence of these components on tunnel performance. Contraction and working section designs, which have been studied widely over the years, differ little between open-circuit and closed-circuit tunnels, and are thus discussed here in lesser detail. Some advice on structural considerations and their influence on the aerodynamic design of tunnels is also included. The design rules and suggestions, based mainly on data collected from successful blower tunnel designs, are supplemented by some new experimental results for wide-angle diffusers, screens and blowers.
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