Gas Generator Ideal Cycle w/ Air Standard, Const. Properties (6.4.1)
If you assume the kinetic energy leaving the engine is small, the hsh50 h40 nozzle is fixed
Whet = h30-h40-(h2o-Ohio) We-We
Whet 9in CP(130-140-720+Tio) Cp(T30-T20) 150-710 =>=1-730-720 Lo variation of kinetic energy is small
plug into y
(TS/T,-1) TI 21- (13/12-1) 2 => y=1-2 don't confuse w/ Carnot Cycle
Can also say
Maximum Work for fixed T, and T3 (6.5.1.1)
Wnet Cp (T3-T5-T2+T₁) =CP (T3+T₁-12-17)
Wnet 2T2 CP (-1+2)=0
Maximum temperature > T2 = NT3 TI
Plug into Whet
Whet max Cp (T3+T, 2 NTT3)
T Ti T5 T₂ at Whet max
Y = => =
Look at Ex. later
Gas Generator Ideal Cycle w/ Air Standard, Variable Properties (6.5.2)
Case 1: Find h when s and p are given.
S-S=CpIn-RIN
fictitious state.
S=s,+RinP
Find si hi=hi
Case 2: Find s when h and p are given
high, s
5, s, Rinp
Case 3: Find p when s and h are known
h, hiss, -s, Rinp = =
5,-5
- pe R
Put linear interpolation into the calculator
Turbojet Real Cycle w/ Air Standard, Variable Properties (6.6.1)