Dirt particles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the following?

Dirt particles in the air that enter the compressor of a turbine engine can lead to various issues, including the formation of coatings on different engine components. However, turbine blades are typically located downstream of the combustion process and are designed to withstand higher temperatures and erosive conditions compared to other components.

The turbine blades operate at elevated temperatures and within a different flow context than the compressor blades. As a result, while dirt and contaminants can indeed impact the performance of turbine blades, they are less likely to develop a significant coating from dirt particles in the same way that components like compressor blades, inlet guide vanes, and casings, which are exposed to the incoming air and particulates, may do.

Compressor blades, casings, and inlet guide vanes play more direct roles in interacting with the unfiltered air entering the engine, making them more susceptible to coating formation from dirt particles. Over time, this can lead to reduced efficiency and performance in these components, while turbine blades, despite being affected, may not show the same coating buildup primarily due to their different operational environment.