Page 337 - Fluid Mechanics and Thermodynamics of Turbomachinery
P. 337
Index 319
Optimum space-chord ratio 87 8 Radial flow turbines, Ch. 8
Optimum design selection (IFR turbines) basic design of rotor 241 2
26 et seq. cantilever type 237 8
Overall performance criterion for number of vanes 253 6
compressor characteristic 18 20 cooled 271 2
turbine characteristic 18 20 effect of specific speed 267 8
inward flow types 237 9
Mach number relations 246 7
Pascal, unit of pressure 4
nominal design point efficiency 242 6
Pelton wheel turbine 2, 3, 279, 280 90
nozzle loss coefficients 247 8
energy losses 286
optimum design selection 266 9
nozzle efficiency 287
optimum flow considerations 248 et
overall efficiency 287 8
seq.
speed control 284
Penstock 285 rotor loss coefficients 248
diameter 286 velocity triangles 238, 239
Perfect gas 16, 17 Reaction
blade 70 1
Performance characteristics of
compressor stage 143 4, 172 3, 176
turbomachines 7
effect on efficiency 107 8
Pitch-line analysis assumption
fifty per cent 103
axial compressor 138 9
true value 179
axial turbine 93
Polytropic index 38 turbine stage 101 4, 290
Power coefficient 6, 18, 301 zero value 102 3
Prerotation, effect on performance 209 12 Reheat factor 40
Pressure head 4 Relative eddy 214
Reynolds number
Pressure ratio limits of centripetal turbine
critical value 67
269 71
Rotating stall 157
Pressure recovery factor 46
cause 157 8
Pressure rise coefficient 45
control 159 60
Primary dimensions 6
Profile losses in compressor blading 69 Rothalpy 29, 204 5
Profile thickness 56 Royal Aircraft Establishment (RAE) 137
Propagating stall 64 Royal Society 3
Pump:
centrifugal 7 9, 200, 201, 206 8, 218 9
Scroll 201, 290
efficiency 7
Second law of thermodynamics 23, 29
head increase 218 9
Secondary flow 64
inlet, optimum design 206 8
losses 84 5
mixed flow 2, 9, 12
simplified impeller design 202 vorticity 64
supercavitating 14, 15 Secondary flows 193 5
vane angle 215 6 gyroscope analogy 193
overturning due to 194
Shroud 201, 238
Radial equilibrium Shape number 10
direct problem 179 80 SI units 3 4
equation, theory 169 et seq. Similitude 6 et seq.
forced vortex 175 6 Slip:
free-vortex 171 5 definition 214
general whirl distribution 176 9 factor 213 18
Radial flow 169 in IFR turbines 248 50
Radial flow compressors and pumps, Ch. 7 velocity 214
