Posted on: 12th Apr 2024
EAS201: Aerospace Propulsion Assignment, SUSS, Singapore: The polytropic efficiency ππΉ of a fan is a useful parameter to relate the compressor temperature
Question 6
Question 6a
The polytropic efficiency ππΉ of a fan is a useful parameter to relate the compressor temperature ratio to its pressure ratio such that: ππΉ = ππΉ(πΎβ1) (πΎππΉ)β. Show that the fan polytropic efficiency can be expressed as:
Question 6b
A high-bypass-ratio turbofan engine undergoing bench test at maximum power has the following selected data.
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Question 6b(i)
Evaluate the isentropic efficiency and the polytropic efficiency of the fan.
Evaluate the isentropic efficiency and the polytropic efficiency of the fan.
Question 6b(ii)
Determine the power imparted to the bypass air.
Determine the power imparted to the bypass air.
Question 6b(iii)
Determine the engine fuel–air ratio.
Question 6b(iv)
If a fan of the same design was installed but such that its fan pressure ratio is increased by 10%, evaluate the new fan isentropic efficiency. State the assumption for your evaluation to be valid.
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