Discussion
Arrange these zones by the temperature of the gas leaving each:
1. Compressor delivery, entering the chamber
2. Dilution zone exit, entering the turbine
3. Intermediate zone, where burning completes
4. Primary zone, burning near stoichiometric
Select the correct sequence.
Answer: B
The gas is hottest in the primary zone and is progressively cooled by the air admitted afterwards. That is the whole purpose of the dilution zone, since the primary zone temperature would destroy any turbine blade within seconds.
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