Question 10 [22 marks] A centrifugal pump is configured as shown in Figure 10.1. The pump geometry is defined by r = 350 mm, r = 650 mm, b = 80 mm, = 25 and B = 15. Fresh water at 20C is pumped with a volume flow rate of 1.5 m/s. There is no swirl in the incoming flow. B B 12 Figure 10.1: Schematic of a centrifugal pump. a) Draw the inlet and exit velocity vector diagrams. Mark on the diagram the fluid absolute and relative velocities, the impeller circumferential velocity and the absolute and relative flow angles. (4 marks) b) Determine the impeller speed in rpm which will give a shockless entry flow. (9 marks) c) When the pump is operating at the speed calculated in part (b), determine the ideal torque and ideal power required to drive the pump. (9 marks)