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EAS201: Aerospace Propulsion Assignment, SUSS, Singapore: The polytropic efficiency ππΉ of a fan is a useful parameter to relate the compressor temperature
 University Singapore University of Social Science (SUSS) Subject EAS201: Aerospace Propulsion Assignment
Posted on: 12th Apr 2024

# EAS201: Aerospace Propulsion Assignment, SUSS, Singapore: The polytropic efficiency ππΉ of a fan is a useful parameter to relate the compressor temperature

Question 6

Question 6a
The polytropic efficiency ππΉ of a fan is a useful parameter to relate the compressor temperature ratio to its pressure ratio such that: ππΉ = ππΉ(πΎβ1) (πΎππΉ)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.
Question 6b(ii)
Determine the power imparted to the bypass air.

Question 6b(iii)
Determine the engine fuelair 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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