What is the primary purpose of a single stage compressor turbine?

The primary purpose of a single stage compressor turbine is to power the compressor section. In a gas turbine engine, the compressor turbine is connected to the compressor, and as the turbine spins due to the energy extracted from the hot exhaust gases, it drives the compressor. This mechanical linkage is crucial because the compressor's role is to intake ambient air, compress it, and deliver it to the combustion chamber at a higher pressure. This increased pressure is vital for achieving efficient combustion with the fuel, thereby contributing to the overall efficiency and performance of the engine.

In this context, the other options do not accurately capture the fundamental function of the compressor turbine in the gas turbine system. For example, creating thrust directly involves the reaction of exhaust gases exiting the engine, not the compressor turbine's action. Cooling exhaust gases is more related to afterburner or heat exchanger functions, while mixing fuel with air is a part of the combustion process, which occurs after compression has taken place. Thus, the primary task of the single stage compressor turbine remains to power the compressor, making the correct choice evident.