Pumps

Question 1

What Rotary pumps (priming pumps are used at cfd?

Answer 1

Rotary Vane

Question 2

How do rotary vein pumps work?

Aka priming pumps

Answer 2

They are activated electronically, as the rotor rotates, the moveable vanes inside the rotor compensate for wear and to maintain a tight fit by being forced to the outside of the pump using centrifugal force.
Because of this the pump has minimal slippage and can pump air.

Parts
Drive shaft
Rotor
Veins
Intake
Discharge

Question 3

Centrifugal pump

Answer 3

Water enters the eye of the pump though the intake, and makes contact with the impeller which hurls the water outward into the volute, the volute then transfers the velocity of water into pressure that can be directed out of your discharge.

Doubling the speed with quadruple the pressure.

Can not pump Air

Capable of 100% slippage

Non displacement pump

Question 4

Cavitation

Answer 4

The greater the pump flow rate, the greater the pressure drop between the pump intake and the eye of the impeller. When pressure is reduced its boiling point is also reduced. If the pressure drop is large enough or if the temperature is hot enough it will cause the water to flash to vapor. These vapor bubbles then get thrown to the pressure side of the volute and collapse. The process of formation and subsequent collapse of those bubbles is cavitation

Fixes

Lower discharge
Bring in additional supply
Check your strainer

Sounds like marbles being shaken