Discussion
Arrange the air's passage through a combustor in order:
1. Compressor delivery air is slowed in the diffuser
2. Part enters the primary zone through the swirler
3. Combustion proceeds near stoichiometric in the recirculation zone
4. Intermediate air completes the burning of remaining products
5. Dilution air lowers the temperature to what the turbine accepts
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4, 5
The sequence follows the air through the chamber. Compressor delivery air is first slowed in the diffuser, since the flame could not be held at compressor exit velocity. A fifth of it then enters the primary zone through the swirler, where the mixture is near stoichiometric and the recirculation holds the flame. Intermediate air completes the burning, and dilution air finally brings the temperature down to what the turbine will accept.
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