An axial-flow blower is used for a wind tunnel that has a test section measuring 60 cm by 60 cm and is capable of airspeeds up to 40 m/s. If the blower is to operate at maximum efficiency at the highest speed and if the rotational speed of the blower is 2000 rpm at this condition, what are the diameter of the blower and the power required? Assume that the blower has the characteristics shown in Fig. 14.7. Assume ρ = 1.2 kg/m³.

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100 5.00 80 4.00 3.00 40 2.00 CH CP 20 1.00 p.2 0.4 0.6 0.8 Co Cp and CH Efficiency, percent