What is the primary purpose of the stator system in the turbine section?

The primary purpose of the stator system in the turbine section is to increase the velocity of the working fluid and decrease its pressure. The stator blades, which are stationary components in the turbine, play a crucial role in redirecting the airflow that comes from the combustion chamber. As the high-energy gases pass through the stator, their pressure decreases while their velocity simultaneously increases. This dynamic is vital for maximizing the energy conversion efficiency in the turbine.

The design of the stators ensures that the gas flow is properly directed onto the rotor blades, allowing the rotors to extract energy from the high-speed gases. The increased velocity of the exiting gases aids in efficient energy transfer to the rotor, which in turn drives the compressor and generates thrust.

In contrast, while providing structural support is a function of various turbine components, the stator's design primarily focuses on aerodynamic efficiency rather than structural integrity. Igniting fuel is the role of the combustion chamber, and reducing emissions is typically addressed at the engine's exhaust system or via post-combustion technologies, rather than through the function of the stator system itself. Thus, the correct answer highlights the essential aerodynamic function of the stator in enhancing turbine performance.