Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

xx List of Symbols
M Mach number
m mass, molecular “weight”
N rotational speed, axial length of diffuser
NS specific speed (rev)
power specific speed (rev)
NSP
NSS
suction specific speed (rev)
n number of stages, polytropic index
P power
p pressure
pa atmospheric pressure
vapour pressure
pv
pw
rate of energy loss
Q heat transfer, volume flow rate
q dryness fraction
R reaction, specific gas constant, tip radius of a blade, radius of
slipstream
Re Reynolds number
reheat factor
RH
Ro
universal gas constant
r radius
S entropy, power ratio
s blade pitch, specific entropy
T temperature
t time, thickness
U blade speed, internal energy
u specific internal energy
V, v volume, specific volume
W work transfer
DW specific work transfer
w relative velocity
X axial force
x, y, z Cartesian coordinate directions
Y tangential force, actual tangential blade load per unit span
Yid ideal tangential blade load per unit span
Yk tip clearance loss coefficient
Yp profile loss coefficient
YS net secondary loss coefficient
Z number of blades, Ainley blade loading parameter
a absolute flow angle
b relative flow angle, pitch angle of blade
G circulation
g ratio of specific heats
d deviation angle
e fluid deflection angle, cooling effectiveness, drag–lift ratio