Discussion
Match each efficiency in List I with what governs it in List II.
List I
A. Thermal efficiency
B. Propulsive efficiency
C. Overall efficiency
D. Propeller efficiency
List II
1. Pressure ratio and turbine entry temperature
2. The ratio of jet velocity to flight velocity
3. The product of the first two
4. Blade design and the advance ratio
Select the correct match.
Answer: A
Knowing which lever moves which efficiency is what makes a design argument coherent. Raising turbine entry temperature does nothing for propulsive efficiency, and lowering jet velocity does nothing for the thermodynamics of the core.
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