EAS201: Aerospace Propulsion Assignment, SUSS, Singapore: In an ideal unmixed-exhaust turbofan engine where the exhaust exit pressures of both the core engine
Question 4
Question 4a
In an ideal unmixed–exhaust turbofan engine where the exhaust exit pressures of both the core engine and bypass duct are equal to ambient pressure, the thrust produced by the core engine πΉπΆ, and the fan πΉπΉ are:
Where
πΜ πΆ = mass flowrate of air through core engine
πΜ πΉ = mass flowrate of air through bypass duct
πΜπ = fuel mass flowrate
π0 = forward velocity
π9 = core engine exhaust nozzle exit velocity
π19 = bypass duct nozzle exit velocity
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Question 4a(i)
For a turbofan engine, explain the term specific thrust. If its bypass ratio πΌ = πΜ πΉ/πΜ πΆ, show that the specific thrust can be expressed as:
Question 4a(ii)
Define the term thrust specific fuel consumption of a turbofan engine, and hence show that it can be expressed in terms of its specific thrust as in the following:
Question 4b
At forward speed of 750 km/h, a turbofan engine with bypass ratio of 5 has a fuel-air ratio of 0.03. At the exhaust nozzles of both the bypass duct and core engine, the gases are fully expanded. The bypass exhaust exits at 450 m/s while the core engine exhaust exits at 500 m/s. Analyse the engine specific thrust.
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