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Simulation reveals how compressibility affects fan design in VTOL aircraft, suggesting optimal disc loadings for efficiency.
In reference 1 a rather simplified theory of axial-flow wing-immersed lifting fans for VTOL aircraft was presented for the purpose of preliminary design and size and weight estimation. At the time of writing disc loadings of about 200-400 lb/ ft²were considered, and it was felt that the effects of compressibility on the design of the fans could be neglected. Reference 2 investigated the effects of fan disc loading on the weight and cost of VTOL powerplants with gross disc loading varying from 200 to 1000 lb/ ft². The resulting curves of weight and cost were lowest but rather flat in the 500-1000 lb/ ft² region, showing optima lying between 500 and 750 lb/ ft² depending upon the criteria of either weight or cost.
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N. Galitzine (1960) studied this question.
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