Gas Turbine Handbook : Principles and Practices

Appendix C 373
P 2
P 3
P 4
P 5
P 3 /P 2
P 4 /P 2
P 4 /P 3
P AMB
PE 1
PE 2
P i
P o
cP
P PT
Ps 3
Ps 4
P t7
Q
Compressor inlet pressure, psia
Single spool compressor discharge pressure, single spool
low pressure compressor discharge pressure, psia
Dual spool low pressure compressor discharge pressure,
psia
Turbine inlet pressure, psia
Single spool compressor pressure ratio, dual spool low pressure
compressor pressure ratio
Dual spool compressor pressure ratio
Dual spool high pressure compressor pressure ratio
Atmospheric total pressure, psia
Potential energy of the fluid entering, Btu/lb m
Potential energy of the fluid leaving, Btu/lb m
Inlet pressure, psia
Discharge pressure, psia
Absolute or Dynamic Viscosity, Centipoises
Power input to the load device, Btu/sec
Low pressure compressor out pressure (static), psig
High pressure compressor out pressure (static), psig
Exhaust total pressure, psia
Volume flow cubic feet per second (CFS)
1 Q 2 Heat transferred to or from the system, Btu/lb m
Q m Mechanical bearing losses of the driven equipment, Btu/sec
Q m Mechanical bearing losses of the power turbine, Btu/sec
Q r Radiation and convection heat loss, Btu/sec
R c Compressor pressure ratio
R t Turbine pressure ratio
secs R.I. Redwood No 1 (UK), seconds
cST Kinematic viscosity = Absolute viscosity/density.
centistokes
SUS Saybolt Universal (USA), seconds
T 1DB Dry bulb temperature upstream of the cooler, °R
T 2DB Dry bulb temperature downstream of the cooler, °R
T 2WB Wet bulb temperature downstream of the cooler, °R
T 2 Compressor inlet temperature, °R
T 3 Single spool compressor discharge temperature, dual spool
low pressure compressor discharge temperature, °R
T 4 Dual spool low pressure compressor discharge temperature,
°R