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An annular combustion chamber is a type of combustion chamber used in gas turbines, where the design features a continuous annular (ring-shaped) configuration. Here’s how it typically works:
- Structure: The combustion chamber consists of a cylindrical outer casing and a perforated flame tube that forms an annular ring within the casing.
- Air and Fuel Flow: Compressed air from the compressor section of the gas turbine enters the annular space between the outer casing and the flame tube.
- Combustion: Fuel is injected into the combustion chamber through the perforations in the flame tube. The mixture of air and fuel ignites within the flame tube, generating high-temperature gases.
- Exhaust: The hot gases produced by combustion flow downstream through the turbine section of the gas turbine, where they expand and produce mechanical energy to drive the turbine.
Annular combustion chambers are favored in gas turbines because they provide efficient mixing of air and fuel, uniform temperature distribution, and compact design, which is advantageous for turbine performance and efficiency.
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