Page 17 - Fluid Mechanics and Thermodynamics of Turbomachinery

xvi Fluid Mechanics, Thermodynamics of Turbomachinery

p a atmospheric pressure
p v vapour pressure
Q heat transfer, volume flow rate
q dryness fraction
R reaction, specific gas constant
Re Reynolds number
reheat factor
R H
universal gas constant
R o
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
W 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
Y id ideal tangential blade load per unit span
Y k tip clearance loss coefficient
Y p profile loss coefficient
Y S net secondary loss coefficient
Z number of blades, Ainley blade loading parameter

˛ absolute flow angle
ˇ relative flow angle
 circulation

ratio of specific heats
υ deviation angle
ε fluid deflection angle, cooling effectiveness
enthalpy loss coefficient, total pressure loss coefficient
efficiency
 minimum opening at cascade exit
blade camber angle, wake momentum thickness
profile loss coefficient
dynamic viscosity
kinematic viscosity, blade stagger angle, velocity ratio
density
slip factor, solidity
b blade cavitation coefficient
c Thoma’s coefficient, centrifugal stress
torque