# Combustion Chamber Classification:
1. Can Type Combustor
- Can combustors are self-contained cylindrical combustion chambers.
- Each "can" has its own fuel injector, igniter, liner, and casing.
- The primary air from the compressor is guided into each individual can, where it is decelerated, mixed with fuel, and then ignited.
- The secondary air also comes from the compressor, where it is fed outside of the liner (inside of which is where the combustion is taking place).
- The secondary air is then fed, usually through slits in the liner, into the combustion zone to cool the liner via thin film cooling.
- In most applications, multiple cans are arranged around the central axis of the engine, and their shared exhaust is fed to the turbine(s).
- Can type combustors were most widely used in early gas turbine engines, owing to their ease of design and testing (one can test a single can, rather than have to test the whole system).
- Can type combustors are easy to maintain, as only a single can needs to be removed, rather than the whole combustion section.
- Most modern gas turbine engines (particularly for aircraft applications) do not use can combustors, as they often weigh more than alternatives.
- Additionally, the pressure drop across the can is generally higher than other combustors (on the order of 7%).
- Most modern engines that use can combustors are turbo-shafts featuring centrifugal compressors.
2. Cannular Type Combustor
- Like the can type combustor, can annular combustors have discrete combustion zones contained in separate liners with their own fuel injectors.
- Unlike the can combustor, all the combustion zones share a common ring (annulus) casing. Each combustion zone no longer has to serve as a pressure vessel.
- The combustion zones can also "communicate" with each other via liner holes or connecting tubes that allow some air to flow circumferentially.
- The exit flow from the cannular combustor generally has a more uniform temperature profile, which is better for the turbine section.
- It also eliminates the need for each chamber to have its own igniter. Once the fire is lit in one or two cans, it can easily spread to and ignite the others.
- This type of combustor is also lighter than the can type, and has a lower pressure drop (on the order of 6%).
- However, a cannular combustor can be more difficult to maintain than a can combustor.
- An example of a gas turbine engine utilizing a cannular combustor is the Rolls-Royce Tay turbofans use this type of combustor as well.
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Table of Contents:
- What Is Combustion Chamber?
- Classification Of Combustion Chamber
- Can Type Combustion Chamber
- Cannular Type Combustion Chamber
- Annular Type Combustion Chamber
- Double Annular Type Combustion Chamber
- Comparison Diagram