Question

12.15 The performance characteristics of a certain centrif- ugal pump having a 9-in.-diameter impeller and operating at 1750 rpm are determined using an experimental setup similar to that shown in Fig. 12.10. The following data were obtained during a series of tests in which z2-z, = 0, ½ = V, , and the fluid was water Q (gpm) 20 40 60 80 100 120 140 P2 P (psi) 40.2 40. 38. 36.233.530 25.8 Power input (hp) 1.58 2.271 2.671 2.95 3.19 3.49 4.00 Based on these data, show or plot how the actual head rise, h, and the pump efficiency, η, vary with the flowrate. What is the design flowrate for this pump?

Answer 1

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