In which part of the combustion section does combustion take place entirely?

The combustion process in a gas turbine engine occurs specifically within the combustion chamber. This area is designed to facilitate the complete burning of the fuel-air mixture. The combustion chamber is engineered to allow for optimal mixing and residence time, ensuring that the fuel ignites and burns completely, thus maximizing efficiency and minimizing emissions.

The perforated inner liner is a component that helps support combustion and may assist in the stabilization of the flame, but it does not represent the area where combustion takes place entirely. The burner dome serves to mix the fuel and air and initiate combustion but is not the location where combustion fully occurs. The exhaust section, on the other hand, is designed for the expulsion of exhaust gases after combustion has taken place, not for the combustion process itself.

Therefore, the combustion chamber is the designated area where the entire combustion process happens, making it the correct answer.