文档介绍：Abbreviations
T1 - Temperature going pressor
T2 - Temperature out pressor
T3 - Temperature out bustor, same as TIT
T4 - Temperature out of turbine, same as TOT
T5 - Temperature out of jet nozzle or freepower turbine, same as EGT
P1 - Pressure pressor, atmospheric pressure
P2 - Pressure out pressor
P3 - Pressure out bustor , going into turbine stage
P4 - Pressure out of turbine, same as in jetpipe
P5 - Pressure out of jet nozzle
All of the above can be in either static temperature and pressure, total temperature and
pressure , bination of static plus ponents absolute , where total temp
and pressure are scaled above minus 273 C , minus 460F ( in degrees Kelvin or
Rankine) and plete vacuum in the case of pressure. Absolute readings are used
when doing calculations.
TIT- Turbine Inlet Temperature, same as T3
TOT - Turbine Outlet Temperature, same as T4
PR - Pressure Ratio, P1+P2 divided by P1 when P2 is measured on a "normal
g/g" with its start point (zero psi) equal to P1 of at sea level. This is a reason
for using "absolute" readings for calculations, its less "messy", it then es simply
P2 absolute divided by P1 absolute, it doesn't make any difference what altitude or
pressure you're at.
EGT - Exhaust Gas Temperature. Accronym widely used to indicate the temperature
out of an bustion engine. In our case it is used to refer to the temperature
out of the jet nozzle or a freepower turbine where the hot exhaust gases are
discharging to ambient/atmospheric temperatures/pressures. Temperatures may be
slightly higher ( +50 degrees ) due to the dynamic (frictional heat) aspect of the fast
moving gases especially when using unshielded temperature probes.
psi - Pounds per Square Inch (pressure)
rpm - Revolutions Per Minute
g/g - gauge , gage
f/f - fuel flow
v/v – valve
A/R - the ratio of the area of the turbines nozzle , to the distance from its centre to
the turbines centre , all to do with vortex flow changing velocities an