What type of engine-driven fuel pump is known for its rotary motion?

The rotary vane type fuel pump is known for its rotary motion, which is integral to its operation. In this type of pump, fuel enters through an inlet and is trapped between vanes that are mounted on a rotor. As the rotor turns, the vanes slide in and out, creating a pumping action that moves the fuel through the pump. The rotary motion allows for continuous fuel delivery and contributes to the efficiency and smooth operation of the fuel system.

This design is particularly favored in aircraft engines because it can handle fluctuations in fuel demand effectively while maintaining a consistent pressure, which is crucial for engine performance. The reliance on rotary action distinguishes it from other pump types, such as gear and piston types, which operate on different principles and mechanisms, primarily involving linear motion or fixed displacement.