Discussion
Match each parameter in List I with what it governs in List II.
List I
A. Combustion efficiency
B. Total pressure loss
C. Pattern factor
D. Weak extinction limit
List II
1. Fuel consumption
2. Thrust available to the engine
3. Turbine blade life
4. How rapidly the engine may be decelerated
Select the correct match.
Answer: A
Correct answer: A-1, B-2, C-3, D-4
Each parameter has a consequence outside the chamber. Combustion efficiency shows up as fuel consumption. Pressure loss is total pressure the turbine never sees, so it costs thrust. Pattern factor sets turbine blade life through the hottest blade. And the weak extinction limit sets how rapidly the engine may be decelerated without the flame going out.
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