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Experimental investigation reveals optimum inlet bellmouth sizes for desired ducted fan performance in aircraft wings, suggesting effective design strategies.
The N.R.C. fan-in-wing VTOL scheme employs a ducted fan completely immersed in the wing of an aircraft. This means that the fan must have the minimum possible axial lengths, to allow its installation in the thickness of a thin wing section. An investigation of the relation between fan performance and inlet bellmouth dimensions was therefore carried out to find the minimum bellmouth size consistent with any desired fan performance. These experiments covered a range of fan hub/tip diameter ratios, and a large range of fan disc loadings.
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H. S. Fowler (1959) studied this question.
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