12. CCww
α
C
CCff
u
CCrr
Q = CCff *A
H e= 1/g ( u2 Cw2 – u1 Cw1 )
For reduced capacity
Cf will decrease
&
CCww
α
CCff
u
C Cw will increase
CCrr
13. Because of this reason for a centrifugal compressor
(with backward curved vane) following head-capacity
curve is obtained
Head
Capacity
Centrifugal compressor
Actual
Ideal