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Path: ACPro/Airbreathing
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Mixed flow turbofan engine performance.
A mixed flow turbofan is one in which the fan and core streams mix in
the same nozzle. This model supports afterburning. The outputs are the
same as RamjetH2. Only mks units are supported in this function.
Type MixedFlowTurbofan for a demo.
This function employs a reference model and its outputs are deviations
from the reference model. Type
ref = MixedFlowTurbofan
to get the reference data structure along with the demo.
Note that only ref.h0 need be entered for the atmospheric parameters.
The following are computed from the Standard Atmosphere and AtmGamma
as follows.
q = StdAtm( ref.h0 );
ref.p0 = q.pressure;
ref.a0 = q.speedOfSound;
ref.t0 = q.temperature;
ref.rho = q.density;
ref.gammaC = AtmGamma( ref.t0 );
Since version 5.
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Form:
[t, tSFC, f, M, thR] = MixedFlowTurbofan( action, varargin )
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Inputs
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action (1,:) 'initialize' 'update'
if action == struct
t (.) Default data
if action == 'initialize'
ref (1,1) Reference conditions
See JetEngineDefinitions.m
if action == 'update'
h (1,1) Altitude
v (1,1) Velocity
p (1,1) Throttle settings
.afterburner (1,1) Afterburner on == 1
.throttleRatio (1,1) Throttle ratio
.tT4 (1,1) Combustor temperature (K)
.tT7 (1,1) Afterburner temperature (K)
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Outputs
-------
if action == 'initialize'
ref (1,1) Full set of reference conditions
if action == 'update'
t (1,1) Thrust (N/m^2)
tSFC (1,:) Thrust specific fuel consumption
f (1,1) Fuel air ratio structure
.f (1,1) Fuel air ratio
.fAB (1,1) Afterburner fuel air ratio
.fO (1,1) Mixed fuel air ratio
M (1,:) Mach number
thR (1,:) Thrust to mass flow ratio
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Reference: Mattingly, "Elements of Gas Turbine Propulsion,"
McGraw-Hill, 1996, 2005, p.551
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ACPro: ACEngine/MachFromMassFlowParameter ACPro: ACEngine/MachFromPR ACPro: ACEngine/MassFlowParameterR ACPro: ACEngine/RFromCPAndGamma ACPro: ACEngine/RamRecovery ACPro: ACEngine/TempRatioFromMachAndGamma ACPro: Airbreathing/EngineExample AeroUtils: AtmosphericCalculations/AtmGamma Common: Atmosphere/StdAtm Common: Graphics/Plot2D
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