Types of fluid pumps
Key FactsGyroscopic Couple: The rate of change of angular momentum () = (In the limit).
- = Moment of Inertia.
- = Angular velocity
- = Angular velocity of precession.
Types Of PumpsThere are two basic categories of pumps: 1. Constant Volume Pumps. 2. Constant Pressure Pumps.
Constant Volume Pumps
- Constant volume pumps are also known as Constant Displacement pumps in engineering circles. Amongst Constant Volume pumps, there are four types used in aircraft applications.
a. Gear Type pumps.
b. Vane Type pumps.
c. Gerotor pumps.
d. Piston pumps.
Constant displacement pumps deliver a fixed volume of fluid at low, medium, or high pressure, depending on the needs of the system.
Gear Type Pump
- The classic gear type pump is a spur gear arrangement, as illustrated in the diagram alongside. It uses two meshing external tooth gears that fir closely into a figure-eight-shaped housing.