Question

A certain pump is known to have a capacity of 7.0 m2/s when operating at a speed of 60 rad s against a head of 20 m Determine the specific speed Ns of the pump 2.673 Ns = Based on the information in the figure below, would you recommend a radial flow, mixed-flow or axial-flow? Specific speed, N,d - Impeller shrouds -Impeller shrouds - Impeller- shrouds - Impeller hub Hub Hub Hub Hub Vanes Vanes Vanes Vanes Vanes Axis of rotation Radial flow Axial flow Mixed flow LO SO Specific speed, N, mixed-flow the tolerance is +/-2% o'8 00002 o9 0009T Fo'S F00001 0006 0008 000L 0009 0009 O00 fio008 0002 FLo 9'0 00ST 0.5- 0.4 -000I -006 008 00L 009 009

Answer 1

Given,

Discharge, Q = 7.0 m^{​​​​​​3} /sec

Head = 20 m

Speed = 60 rad/s

Specific speed of pump,

wVQ Ns (gha0.75

= 3.028

60 7 (9.81 20)0.75

Flow is Mixed Flow