Definition
The perforated inner metal shell inside a gas turbine engine's combustion chamber, where fuel and air mix and burn. The liner contains the flame, directs the hot gases toward the turbine, and uses cooling air passing through its many small holes to keep its own walls from melting.
Plain English
The metal can-shaped part inside a jet engine where the fuel actually burns. It has lots of small holes that let cooler air flow along its walls so the metal doesn't melt from the flames inside.
Context Anchor
Seen in turbine engine systems and maintenance discussions, especially when the combustion section is inspected for cracks, warping, or burned areas.
Derivation
Combustion' comes from Latin 'combustio,' meaning 'burning up.' 'Liner' means an inner layer that lines or shields something else. So a combustion liner is literally the inner shield that holds and shapes the burning.
Why Pilots Care
Damage or failure of the combustion liner can cause inefficient combustion, hot spots, or downstream turbine damage, directly affecting engine reliability and flight safety.
Analogy
It is like the firebox inside a stove: the fire is meant to stay inside that protected inner area, not touch the outer structure directly.
Intuition Check
Do not think of the combustion liner as a simple covering or padding. In a turbine engine, it is a shaped, heat-resistant part that controls where the flame and airflow go.
Example Sentence 1
During the hot section inspection, the mechanic found small cracks in the combustion liner and removed it for repair.
Example Sentence 2
Cooling air flows through the holes in the combustion liner to protect it from the intense flame inside the combustor.