Definition
The inner metal housings inside a turbine engine's combustion chamber where fuel and air are mixed and burned. Combustion liners are designed to contain the flame, direct the flow of hot gases toward the turbine, and protect the surrounding engine structure from the extreme temperatures of combustion. They have small holes and louvers that admit cooling air along the inner walls to keep the metal from melting.
Plain English
The metal cans or sleeves inside a jet engine where the fuel actually burns. They hold the flame in the right place and stop the heat from destroying the rest of the engine.
Context Anchor
Seen in turbine-engine maintenance, especially when inspecting the area of the engine where fuel burns.
Derivation
Combustion' comes from Latin combustio, meaning 'burning up.' 'Liner' is something that lines (covers the inside of) a container. So a combustion liner is literally the inner lining of the chamber where burning takes place — a useful image because the liner is exactly that: a heat-resistant inner shell sitting inside the outer combustion chamber casing.
Why Pilots Care
Damaged liners can cause uneven burning, hot spots, or loss of engine efficiency, directly affecting thrust and reliability.
Intuition Check
Do not think of a liner as a soft covering or padding. In this context, a combustion liner is a strong, heat-resistant metal part that controls where the flame goes inside the engine.
Example Sentence 1
During the hot section inspection, the technician found small cracks in one of the combustion liners and tagged it for replacement.
Example Sentence 2
Proper cooling holes in the combustion liners keep the flame centered and prevent damage to the surrounding engine parts.