Discussion
Consider the following pairs of efficiency and what it describes:
Thermal efficiency - Fuel energy converted to kinetic energy of the gas
Propulsive efficiency - Jet kinetic energy becoming useful thrust power
Overall efficiency - The product of the two
Propulsive efficiency - Dependent on pressure ratio and turbine entry temperature
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
The first three are right, including that overall efficiency is the product. The fourth attaches the wrong dependence to propulsive efficiency: pressure ratio and turbine entry temperature govern the *thermal* efficiency, how well the fuel energy becomes kinetic energy in the gas. Propulsive efficiency depends only on how that jet velocity compares with the flight velocity.
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