Discussion
Air distribution through a typical combustor.
| Destination | Share of total air | Purpose |
|---|---|---|
| Primary zone | 20 per cent | Near stoichiometric burning |
| Intermediate zone | 20 per cent | Completing combustion |
| Dilution | 35 per cent | Setting turbine entry temperature |
| Wall cooling | 25 per cent | Protecting the flame tube |
Why does the primary zone receive only a fifth of the air?
Answer: A
Correct answer: So that its local mixture is near stoichiometric
The overall chamber runs at about 60 to 1 by mass, roughly four times leaner than a flame will sustain. Admitting only a fifth of the air to the primary zone brings the local mixture close to stoichiometric, where the flame is stable and burns quickly. The rest of the air is added downstream, where it completes combustion and then cools the products.
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