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Axial-flow Turbines: Two-dimensional Theory 129
0.04
0.02
p *
0
0 0.1 0.2
f=c x /U
(a)
100
80
60
h,%
40
20
0
0 0.1 0.2
f=c x /U
(b)
FIG. 4.26. Comparison of theory with experiment for the Wells turbine: theory
----- experiment (adapted from Raghunathan 1995). (a) Non-dimensional pressure
drop vs flow coefficient; (b) Efficiency vs flow coefficient.
these are:
flow coefficient D c x /U
2lZ
solidity at mean radius D .
D t .1 C /
hub/tip ratio D D h /D t
blade aspect ratio AR D blade length/chord
blade tip clearance ratio D t c /D t
