What is the most common type of damage found in the combustion section?

The most common type of damage found in the combustion section of gas turbine engines is cracking. This phenomenon occurs due to the severe thermal and mechanical stresses present in the combustion section, where high temperatures and pressure conditions are prevalent.

As fuel is injected and ignited, the combustion process generates intense heat leading to rapid thermal cycling. The materials used in the combustion chamber and related components are exposed to large temperature gradients, which can result in differential thermal expansion. Over time, these repeated thermal stresses can cause the materials to develop cracks, especially at weld joints or regions where there is a change in geometry or material properties.

Cracking can lead to significant structural integrity issues and can compromise engine performance if not addressed. It is critical to monitor and inspect the combustion section for cracks to ensure reliability and safety during operation. Detecting and mitigating cracking is vital to maintain the operational lifespan of gas turbine engines, making it the most common damage type observed in this area.