What component maintains the radial position of the propulsion turbine rotor?

What component maintains the radial position of the propulsion turbine rotor?

• A. Plain bearings
• B. Journal bearings
• C. Roller bearings
• D. Thrust bearings

Answer: (B)

The component that maintains the radial position of the propulsion turbine rotor is journal bearings. Journal bearings are designed to support the rotating shaft by providing a low-friction surface that allows it to turn freely while maintaining its position. They operate by having a shaft (the journal) fit within a bearing that can withstand the radial loads applied by the rotor. In the context of propulsion turbines, these bearings are essential because they allow for fluid film lubrication, which minimizes wear and tear and enhances the distribution of loads across the bearing surface. This helps in ensuring that the rotor remains centered and operates smoothly within the turbine casing, providing efficiency and stability during operation. While plain bearings also support shafts and provide radial positioning, they typically provide less effective long-term support compared to journal bearings, particularly in high-load applications where the lubrication characteristics of journal bearings come into play. Roller bearings are generally used for handling higher axial loads, and thrust bearings are specifically designed to accommodate axial loads rather than radial positioning. Therefore, the role of maintaining the radial position directly aligns with the operation of journal bearings.

The component that maintains the radial position of the propulsion turbine rotor is journal bearings. Journal bearings are designed to support the rotating shaft by providing a low-friction surface that allows it to turn freely while maintaining its position. They operate by having a shaft (the journal) fit within a bearing that can withstand the radial loads applied by the rotor.

In the context of propulsion turbines, these bearings are essential because they allow for fluid film lubrication, which minimizes wear and tear and enhances the distribution of loads across the bearing surface. This helps in ensuring that the rotor remains centered and operates smoothly within the turbine casing, providing efficiency and stability during operation.

While plain bearings also support shafts and provide radial positioning, they typically provide less effective long-term support compared to journal bearings, particularly in high-load applications where the lubrication characteristics of journal bearings come into play. Roller bearings are generally used for handling higher axial loads, and thrust bearings are specifically designed to accommodate axial loads rather than radial positioning. Therefore, the role of maintaining the radial position directly aligns with the operation of journal bearings.