Question 4
Question 4a
In an ideal unmixedโexhaust 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 ๐น๐ถ, and the fan ๐น๐น are:
Where
๐ฬ ๐ถ = mass flowrate of air through core engine
๐ฬ ๐น = mass flowrate of air through bypass duct
๐ฬ๐ = fuel mass flowrate
๐0 = forward velocity
๐9 = core engine exhaust nozzle exit velocity
๐19 = 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 ๐ผ = ๐ฬ ๐น/๐ฬ ๐ถ, 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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