Which lubrication system is used primarily on centrifugal-flow engines?

• A. Wet Sump
• B. Partial Sump
• C. Pressure Sump
• D. Open Sump

Answer: (A)

The lubrication system primarily used on centrifugal-flow engines is the wet sump system. In a wet sump lubrication system, oil is stored in the engine's sump or crankcase, from where it is circulated through the engine by a pump. This is beneficial for engines like centrifugal-flow engines, which often have a simpler design and layout.

The wet sump system efficiently delivers oil to various engine components while allowing any excess oil to return to the sump. This system is particularly advantageous because it minimizes the need for additional oil tanks or complex plumbing, which can be critical in the compact environments of aircraft engines.

Centrifugal-flow engines are designed to maintain consistent oil pressure and flow throughout the engine, and the wet sump design effectively supports this requirement by ensuring a steady supply of oil where it is needed, helping to reduce wear and maintain engine performance.