Page 18 - Fluid Mechanics and Thermodynamics of Turbomachinery

List of Symbols xvii
flow coefficient, velocity ratio
 stage loading factor
 speed of rotation (rad/s)
 S specific speed (rad)
 SP power specific speed (rad)
suction specific speed (rad)
 SS
ω vorticity
ω stagnation pressure loss coefficient

Subscripts

av average
c compressor, critical
D diffuser
e exit
h hydraulic, hub
i inlet, impeller
id ideal
is isentropic
m mean, meridional, mechanical, material
N nozzle
n normal component
o stagnation property, overall
p polytropic, constant pressure
R reversible process, rotor
r radial
rel relative
s isentropic, stall condition
ss stage isentropic
t turbine, tip, transverse
v velocity
x, y, z cartesian coordinate components
tangential

Superscript

Ð time rate of change
- average
0
blade angle (as distinct from flow angle)
* nominal condition