A turbojet engine inducts 45 kg of air per second

second and propels an aircraft with uniform flight speed of 880 km/hr. The isentropic enthalpy change for nozzle is 188.37 kJ/kg and its velocity coefficient is 0.96. The fuel air ratio is 0.012, the combustion efficiency is 0.95 and the lower heating value of fuel is 44000 kJ/kg.

Calculate :

i) The thermal efficiency of the engine.

ii) The fuel flow rate in kg/h and TSFC

iii) The propulsion power in kw

iv) The thrust power

v) The propulsive efficiency

vi) The overall efficiency.

Subject : Thermal and Fluid Power Engineering

Topic : Jet Propulsion Engines

Difficulty : High

tfpe(66) • 315  views
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