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Symbol 
Description 

α 
Angle of absolute flow 
β 
Angle of relative flow 
γ 
slip coefficient, Stagger angle 
δ 
Deviation angle flow / blade 
δr 
Swirl number 
ε 
Drag ratio 
η 
Efficiency 
μ 
Decreased power factor (sweeping) 
ν 
Diameter ratio 
π 
Pressure ratio 
ρ 
Density 
σ 
Thickness in circumferential direction; Speed coefficient 
τ 
Blockage of flow channel by blades 
φ 
Wrap angle; Flow coefficient 
ψ 
Work coefficient (= pressure and head coefficient) 
ω 
Angular velocity 
Λ,σ,δ,ν 
Sweep angles 
Symbol 
Description 
A 
Cross section area 
b 
Width 
c 
Absolute velocity 
cm 
Meridional velocity (cm=wm) 
cu 
Circumferential component of absolute velocity 
cL 
Lift coefficient 
cD 
Drag coefficient 
d 
Diameter 
f 
Camber 
F 
Force 
h 
Enthalpy 
H 
Pump head 
i 
Incidence angle 
l 
Chord length 
L 
Length 
M 
Torque; Meridional coordinate 
m 
Meridional coordinate (dimensionless) 
ṁ 
Mass flow 
n 
Number of revolutions 
nq, Ns 
Specific speed 
p 
Pressure 
P 
Power 
Q 
Flow rate 
r, R 
Radius 
s 
Entropy, Orthogonal thickness 
S 
Static moment 
t 
Pitch; Tangential coordinate (dimensionless) 
T 
Temperature, Tangential coordinate 
u 
Circumferential velocity (Rotational speed) 
v 
Velocity 
w 
Relative velocity 
wu 
Circumferential component of relative velocity (wu+cu=u) 
Y 
Specific energy 
z 
Geodetic height; Number of blades 