What is the function of the combustion chamber liner?

• A. To filter cooling air before entering the combustor.
• B. To provide sealing between the combustor and the turbine.
• C. To contain the flame, withstand high temps, and provide cooling and thickness control to protect the combustor shell.
• D. To mix air and fuel in the primary zone.

Answer: (C)

The combustion chamber liner is the inner wall that faces the flame. Its job is to contain the flame and stand up to the extreme temperatures and corrosive gases inside the combustor. It does this while carrying cooling air through internal channels or film-cooling holes to remove heat and keep the liner from overheating. The liner’s thickness is also controlled to manage thermal expansion and maintain structural integrity, protecting the outer combustor shell from damage. This combination—flame containment, high-temperature resistance, and integrated cooling/thickness control—is what makes the liner essential. It isn’t mainly responsible for filtering cooling air, sealing between the combustor and turbine, or mixing air and fuel in the primary zone.