The power turbine is primarily driven by what?

The power turbine in a gas turbine engine is primarily driven by expanding gases. In the combustion chamber of the engine, fuel and air are mixed and ignited, resulting in a high-temperature, high-pressure gas. As this gas expands, it flows through the turbine stages, causing the turbine blades to spin. This mechanical energy generated by the rotation of the turbine is what ultimately powers the engine and enables thrust production.

This process is essential to the operation of the engine, as the expanding gases not only drive the power turbine but also create the necessary exhaust flow to produce thrust from the nozzle. The conversion of thermal energy from fuel combustion into kinetic energy in the form of expanding gases is a fundamental aspect of turbine engine operation.