What is the purpose of the flame tube or liner?
A. The flame tube (also called a liner) fits inside the combustion chamber. It serves three main functions. First, the flame is contained inside the tube and prevented from touching the walls of the combustion chamber which helps keep the chamber from overheating. Second, it slows and diffuses the air flow through the combustion chamber and prevents the flame from being blown out by the air blast. Third, the pattern of holes drilled in the flame holder allows for complete combustion of the fuel and efficient mixing and heating of the air.
