An axial fan 2 m in diameter is used in a wind tunnel as shown (test section 1.2 m in diameter; test section velocity of 60 m/s). The rotational speed of the fan is 1800 rpm. Assume the density of the air is constant at 1.2 kg/m³. There are negligible losses in the tunnel. The performance curve of the fan is identical to that shown in Fig. 14.7. Calculate the power needed to operate the fan.

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Test section 1.2 m 2 m U = 60 m/s