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, and assume that conditions there represent a reasonable average for all of the flowpassing through the fan. That is, assume 1-D flow through the fan at the conditions which exist atthe mean radius:(a)Figure 2 shows a section through the rotor at the mean radius. The flow vectors shownare for the absolutefluid velocities. The flow enters the rotor with no tangentialcomponent of velocity (that is, zero swirl). The flow leaving the rotor has a tangentialvelocity component such that its swirl angle is 50o, as shown. Calculate the powerneeded to drive the rotor, neglecting friction.(b)If the flow downstream of the stators again has zero swirl, what is the total momentapplied by the fluid to the stators?(Ans. 13.5 HP, 70.9 ft-lbf)
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