Discussion
Match each zone in List I with its function in List II.
List I
A. Primary zone
B. Intermediate zone
C. Dilution zone
D. Diffuser
List II
1. Burns near stoichiometric to sustain the flame
2. Completes combustion of remaining products
3. Lowers temperature to what the turbine accepts
4. Slows compressor delivery air before the flame tube
Select the correct match.
Answer: B
The four regions are encountered in the order listed and each solves a different problem. The last is upstream of the flame tube entirely, which is why it is easily forgotten when the chamber is described by its zones alone.
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