What is the function of the High-Pressure Turbine (HPT)?

The High-Pressure Turbine (HPT) serves the primary function of converting thermal energy from the high-temperature gases produced in the combustion process into mechanical energy. As the high-pressure and high-temperature gases expand through the turbine, they drive the turbine blades, which are connected to the engine’s rotor. This mechanical energy is essential for powering the compressor and other components of the gas turbine.

The conversion process is crucial because it allows the gas turbine engine to perform efficiently, generating thrust in aircraft or power in other applications. The effectiveness of the HPT is vital for the overall performance and efficiency of the gas turbine engine.

Options related to increasing gas pressure, cooling combustion gases, or accelerating airflow do not accurately reflect the primary role of the High-Pressure Turbine, which is fundamentally about the conversion of energy rather than altering gas conditions or flow dynamics.