What type of energy does the starter system convert to initiate a gas turbine's operation?

The starter system of a gas turbine is designed to initiate the engine's operation by converting electrical or pneumatic energy into mechanical energy. This mechanical energy is necessary to turn the turbine's compressor and induce airflow, which is crucial for the combustion process and subsequent power generation.

When the gas turbine starts, the starter motor engages and either electrical energy from a battery or generator (in the case of an electric starter) is used to rotate the compressor. Alternatively, pneumatic energy from compressed air can be utilized to achieve the same result, especially in certain turbine systems where air starts are common. This initiation phase is critical for successfully starting the turbine before it can rely on self-sustained combustion once operational.

Other forms of energy, such as thermal, chemical, or nuclear energy, do not play a direct role in the starter's function to begin the operation of a gas turbine. Therefore, the correct choice reflects the predominant energy types involved in initiating the turbine’s startup process.