6.20 A 0.4-m-diameter tube axial fan has a performance target of 0.8๐‘šยณ/๐‘  and a static pressure rise of 225 Pa with ๐œŒ = 1.0 kg/m3. Determine a good hub size and a reasonable speed for the fan. Develop velocity vector diagrams for the inlet and outlet stations at 2๐‘Ÿ/๐ท= 0.75 (the 75% blade radial station).
Estimate static and total efficiencies and modify the outlet vector diagram to account for total pressure losses in the blade row (based on ษณ๐‘‡ from Cordier estimates).

6.22 A vane axial fan has ๐‘„ = 12๐‘šยณ/๐‘  , ๐‘ = 1050๐‘Ÿ๐‘Ÿ๐‘Ÿ , ๐œŒ = 1.18๐‘˜๐‘˜/๐‘šยณ , D = 1.0 m, and d = 0.7 m
Determine the maximum attainable total pressure rise for the fan if the value of
------ = C1/ C2
at the vane hub station must be at least 0.62. Assume initially that ษณ๐‘‡ = 0.75.

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