Page 16 - Advanced thermodynamics for engineers

NOTATION xxv

Isentropic efficiency of nozzle
h j
Propulsive efficiency (sometimes called Froude efficiency)
h p
f Equivalence ratio
r Density
x Specific exergy
j Inner electric potential of a phase
s Temperature ratio
X Exergy

Suffices

0 Dead state conditions
0 Stagnation conditions
a Air (for gas turbine)
Actual Value from actual cycle, as opposed to ideal cycle
av Available (as in energy)
b Backward (reaction)
b Burned (products of combustion)
b Bypass (gas turbines)
bdc Bottom dead centre
B Boiler
c At critical point, e.g. pressure, temperature, specific volume
cc Combustion chamber
cl Clearance (volume, of cylinder)
C Cold (as in temperature of reservoir)
C Compressor
d Diagram factor in engine p–V calculation
e Flow out of system (exit)
evo Exhaust valve opening
Equilibrium molar density
[] e
f Forward (reaction)
f Value for saturated liquid, e.g. h f ¼ enthalpy of saturated liquid
fg Difference between properties on saturated vapour and saturated liquid lines, i.e. h fg ¼ h g h f
g Value for saturated gas, e.g. h g ¼ enthalpy of saturated gas
g Gaseous state (as in reactants or products)
Constant enthalpy
h
H Hot (as in temperature of reservoir)
i Inversion
i Flow into system
i Indicated
ith constituent
i
ig Ignition
in Into system
isen Isentropic (as in a process)
ivc Inlet valve closure
j Jet property
latent Energy required for evaporation (equals h fg or u fg )