In turbine engines, the primary purpose of the gas generator is to:

In turbine engines, the primary purpose of the gas generator is to produce thrust. The gas generator is a key component that encompasses the combustion chamber, turbines, and associated components. It operates on the principle of the Brayton cycle and is responsible for converting the energy contained in the fuel into kinetic energy.

Once fuel is ignited in the combustion chamber, the resulting high-temperature, high-pressure gases expand and flow through the turbine, causing it to spin. This spinning motion not only drives the compressor that supplies air to the combustion process but also produces a high-speed exhaust jet that generates thrust. In turbojets and turbofans, this thrust is what propels the aircraft forward.

While igniting the fuel, providing electrical power, and potentially driving some accessories are all functions associated with various components of the turbine engine, the overarching role of the gas generator is specifically to generate the gases necessary for thrust production, making it essential for the engine's performance.