And assume that conditions there represent a

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, and assume that conditions there represent a reasonable average for all of the flow passing through the fan. That is, assume 1-D flow through the fan at the conditions which exist at the mean radius: (a) Figure 2 shows a section through the rotor at the mean radius. The flow vectors shown are for the absolute fluid velocities. The flow enters the rotor with no tangential component of velocity (that is, zero swirl). The flow leaving the rotor has a tangential velocity component such that its swirl angle is 50 o , as shown. Calculate the power needed to drive the rotor, neglecting friction. (b) If the flow downstream of the stators again has zero swirl, what is the total moment applied by the fluid to the stators? (Ans. 13.5 HP, 70.9 ft-lb f )
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