What maintains the axial position of the propulsion turbine rotor?

The axial position of the propulsion turbine rotor is primarily maintained by thrust bearings. These bearings are specifically designed to absorb and manage the axial loads that occur during the operation of the turbine. When the turbine rotor spins, it generates forces that can push the rotor in both directions along its axial length. Thrust bearings provide a stable platform that helps prevent excessive movement, ensuring the rotor remains in its intended position during operation.

The function of thrust bearings is crucial in maintaining the integrity and efficiency of the propulsion system, as they allow for smooth operation while minimizing wear and tear on components. They are designed to withstand significant loads and maintain alignment under various operating conditions. This stability is vital for the overall performance and longevity of the propulsion system in marine applications.

Other options like rotor lock pins, centrifugal force, and magnetic bearings do not perform the same function as thrust bearings. Rotor lock pins are used for securing the rotor during maintenance or in a non-operational state, while centrifugal force is a byproduct of the rotor's motion rather than a controlling factor for axial positioning. Magnetic bearings, though they can provide support with minimal friction, are typically not employed in traditional propulsion turbine designs in the same way that thrust bearings are.