5. (20) Problem 4.18: a turbojet engine has the following design point parameters: Mo=0, po = 100 kPa, To= 15°C πd = 0.98 πc = 25,ec = 0.90 QR = 42,800 kJ/kg, πb = 0.95, b = 0.98, T₁ = 6.0 et = 0.85, nm = 0.98 πn=0.97, p = Po Calculate (a) Fuel-to-air ratio f (b) Turbine total temperature ratio Tt For the following off-design operation: Mo 0.85, po 10 kPa, To=-15°C, Tλ = 6.5 Assume y = 1.4, cp=1004 kJ/kgK and calculate (c) Tc-off-design if Tt-design = Tt-off-design

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5. (20) Problem 4.18: a turbojet engine has the following design point parameters:
Mo=0, po
= 100 kPa, To= 15°C
πd = 0.98
πc = 25,ec = 0.90
QR = 42,800 kJ/kg, πb
=
0.95, b = 0.98, T₁ = 6.0
et = 0.85, nm = 0.98
πn=0.97, p = Po
Calculate
(a) Fuel-to-air ratio f
(b) Turbine total temperature ratio Tt
For the following off-design operation:
Mo 0.85, po 10 kPa, To=-15°C, Tλ = 6.5
Assume y = 1.4, cp=1004 kJ/kgK and calculate
(c) Tc-off-design if Tt-design = Tt-off-design
Transcribed Image Text:5. (20) Problem 4.18: a turbojet engine has the following design point parameters: Mo=0, po = 100 kPa, To= 15°C πd = 0.98 πc = 25,ec = 0.90 QR = 42,800 kJ/kg, πb = 0.95, b = 0.98, T₁ = 6.0 et = 0.85, nm = 0.98 πn=0.97, p = Po Calculate (a) Fuel-to-air ratio f (b) Turbine total temperature ratio Tt For the following off-design operation: Mo 0.85, po 10 kPa, To=-15°C, Tλ = 6.5 Assume y = 1.4, cp=1004 kJ/kgK and calculate (c) Tc-off-design if Tt-design = Tt-off-design
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