Dirt particles ingested into the compressor coat all components except which?

Dirt particles ingested into the compressor coat all components except which?

• A. Turbine Blades
• B. Combustion Chamber
• C. Piston Rings
• D. Accessory Gearbox

Answer: (A)

When dirt-laden air is drawn into a compressor, particles tend to settle on surfaces that are directly in the path of the incoming air and are relatively cooler or exposed before combustion. These deposits can form on the compressor hardware, the walls of the combustion chamber, and auxiliary components like the accessory gearbox. The turbine blades, however, operate in the hot, high-velocity gas path after combustion and are less likely to develop a lasting dirt coating; any particles that reach them are more likely to cause erosion or burn off in the flame rather than leave a persistent film. So dirt doesn’t form a coating on the turbine blades the way it can on other pre-combustion components.

When dirt-laden air is drawn into a compressor, particles tend to settle on surfaces that are directly in the path of the incoming air and are relatively cooler or exposed before combustion. These deposits can form on the compressor hardware, the walls of the combustion chamber, and auxiliary components like the accessory gearbox. The turbine blades, however, operate in the hot, high-velocity gas path after combustion and are less likely to develop a lasting dirt coating; any particles that reach them are more likely to cause erosion or burn off in the flame rather than leave a persistent film. So dirt doesn’t form a coating on the turbine blades the way it can on other pre-combustion components.