Abstract
Abstract This paper deals with the design and performance of an axial-flow fan for comparatively high pressures. The design is based largely on extensive investigations of the air flow through a fan of well-known design which yielded certain constants. The procedure in design is sketched very briefly—it involves the use of both airfoil theory and circulation theory. Full details are given of the completed fan. The performance of this fan is shown in a series of graphs and is compared with that of the fan used for the preliminary investigations. The influence of the number and location of guide vanes was investigated. Diffuser action is also discussed. The noise emission was measured and was found to be considerably lower than that from the original fan. A relation between noise and fan performance is pointed out.
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