xii
List of Symbols
E m
mechanical energy per unit of mass
J/kg
E p
pressure energy per unit of mass
J/kg
f
force per unit of mass
N/kg
or
friction factor (2.30)
–
or
fuel-air ratio
–
f R
curvature factor (3.26)
–
g
gravitational force per unit of mass
N/kg
h
enthalpy
J/kg
or
blade height or scroll height
m
H m
manometric head
m
I
rothalpy
J/kg
k
equivalent sand-grain roughness
m
L
lift per unit of span
N/m
m
mass flow rate
kg/s
M
rotor moment
Nm
M d
disc or wheel friction moment
Nm
M shaft
shaft moment
Nm
M st
static moment of meridional section
m
3
NPSH
net positive suction head (8.5)
–
n
polytropic exponent
n
unit normal
–
p
pressure
Pa
P
power
W
Pf
Pfleiderer factor (3.23)
m
3
q
heat transferred per unit of mass
J/kg
or
dynamic pressure
Pa
q irr
heat by dissipation inside flow path
J/kg
q irr
0
heat by dissipation outside flow path
J/kg
Q
volume flow rate
m
3
/s
or
heat transferred per unit of time
J/s=W
r
radius
m
or
pressure ratio
–
R
kinematic degree of reaction
–
or
radius of curvature
m
or
gas constant
J/kgK
Re
Reynolds number
–
R p
pressure degree of reaction (3.1)
–
R s
isentropic degree of reaction (6.16)
–
s
entropy
J/kgK
or
spacing of blades
m