gsphelp  Glossary

<< Click to Display Table of Contents >>

Navigation:  »No topics above this level«

gsphelp  Glossary

Previous pageReturn to chapter overviewNext page

Abbreviation

Description

 

SI Dimension

 

 

 

 

A

Flow cross area

 

[m²]

Aratio

throat/exit area ratio

 

[ - ]

Athr_rel

A throat relative to A throat design (Athr/Athrdes)

 

[ - ]

BPR

Bypass ratio

 

[ - ]

bld

bleed flow

 

 

c

core flow (fan, mixer)

 

 

Cf

Correction factor for effective fan duct or core
map mass flow

[ - ]

cl

cooling flow

 

 

d

duct flow (fan, mixer)

 

 

delta

pressure normalized to ISA = p[bar]/1.01325

 

 

DP

Design Point (simulation/calculation mode)

 

DHWin

change in H*Win

 

[kW]

DHWcl

shaft power produced by turbine cooling flow

 

[kW]

DHWkincl

shaft power needed to increase turbine cooling
flow kinetic energy DHWcl due to rotation

[kW]

Droop

Proportional gain in rotor speed governor

(P in PID control)

dTs

Deviation from ISA standard temperature

 

[K]

Elco

carbon monoxide emission index

 

[g/(kg fuel)]

Elnox

nitrogen oxide emission index

 

[g/(kg fuel)]

Eluhc

unburned hydrocarbons emission index

 

[g/(kg fuel)]

Eta

efficiency

 

[ - ]

FAR

Fuel air ratio

 

[ - ]

Fbld

bleedfraction

 

[ - ]

FG

Gross thrust

 

[kN]

FN

Net thrust

 

[kN]

H

specific enthalpy

 

[kJ/kg]

Hbld

bleed flow specific enthalpy

 

[kJ/kg]

ISA

International Standard Atmosphere

 

 

LHV

Lower Heating Value

 

[kJ/kg]

Mach, Macha

Flight mach number

 

[ - ]

Mexit

exit speed in Mach

 

[ - ]

N

rotor speed

 

[rpm]

Nc

corrected rotor speed

 

[rpm]

Ndm

demanded rotor speed

 

[rpm]

Nerror

rotor speed error signal in control system

 

[rpm]

Nsens

rotor speed signal sensed in control system

 

[rpm]

OD

Off-design (simulation/calculation mode)

 

 

Pacc

accelleration power

 

[kW]

Pb

Pressure in combustor. "burner pressure"

 

[bar]

Pbld

Bleed flow pressure

 

[bar]

PLA

Power Lever Angle

 

[°]

PR

Pressure Ratio

 

[ - ]

PS, Ps

Static pressure

 

[bar]

PSexit

static exit pressure

 

[bar]

Pt, PT

total pressure

 

[bar]

PWshaft

Shaft power output

 

[kW]

RD

Ram drag

 

[kN]

RR

Ram Recovery factor

 

[RR]

SFC

Shaft Power Specific Fuel Consumption

 

[kg/(kW h)]

SN

smoke number

 

 

Tbld

bleed flow temperature

 

[K]

Tcorr

corrected temperature

 

[K]

theta

temperature normalized to ISA = T[K]/288.15

 

 

Time

time

 

[s]

TRQ

torque

 

[N m]

TSexit

static exit temperature

 

[K]

TSFC

Thrust Specific Fuel Consumption

 

[kg/(N h)]

TT

total temperature

 

[K]

Vc

Calibrated air speed

 

[m/s]

Vt

True air speed

 

[m/s]

W

air or gas mass flow rate

 

[kg/s]

Wbld

bleed mass flow rate

 

[kg/s]

Wc

corrected mass flow rate

 

[kg/s]

Wf

fuel flow

 

[kg/s]

WfPb

fuel flow devided by burner pressure

 

[(kg/s)/(bar)]

WfPblead

WfPb lead signal (differential term in PID control)

 

[(kg/s)/(bar)]

WfPbmax

Maximum acceleration schedule WfPb

 

[(kg/s)/(bar)]

WfPbmin

Minimum deceleration schedule WfPb

 

[(kg/s)/(bar)]

WfPbtrim

WfPb trim signal (integral term in PID control)

 

[(kg/s)/(bar)]

Zp

Pressure altitude

 

[m]