What is the function of a turbine in a naval nuclear propulsion system?

In a naval nuclear propulsion system, the turbine plays a critical role by converting steam energy into mechanical energy for propulsion. This process occurs in several stages within the system. The reactor generates heat through nuclear fission, which heats water in the primary loop to create steam. This steam then travels to the turbine, where its thermal energy is converted into kinetic energy as it causes the turbine blades to rotate.

This rotation is directly linked to the propulsion of the vessel, as the mechanical energy produced is used either to turn a shaft connected to the propeller or to drive generators that supply electrical power for various systems. Thus, the turbine is essential for transforming the energy produced by the reactor into the mechanical energy required for movement, ensuring the efficiency and operation of the naval vessel.

The other options describe processes that are not the primary responsibilities of the turbine. The conversion of mechanical energy into electrical energy pertains more to generators rather than turbines. The combination of heat and pressure is a general aspect of thermodynamics rather than a specific function of a turbine. Lastly, enhancing fuel combustion relates to the combustion processes used in conventional propulsion systems, which is not applicable in a nuclear setup.