What is cavitation in turbine?
Cavitation in reaction turbines. If the pressure of a liquid in course of its flow becomes equal to its vapour pressure at the existing temperature, then the liquid starts boiling and the pockets of vapour are formed which create vapour locks to the flow and the flow is stopped. The phenomenon is known as cavitation.
What is a type of reciprocating pump?
There are three types of mechanism defined reciprocating pumps: piston, plunger and diaphragm or bellows. Valves at each end of the volume alternately close and open to isolate the higher pressure volume from the suction on the compression stroke and the higher pressure discharge from the volume on the return stroke.
How cavitation occurs in turbine?
Cavitation is formation of vapor bubbles in the liquid flowing through any Hydraulic Turbine. Cavitation occurs when the static pressure of the liquid falls below its vapor pressure. Cavitation is most likely to occur near the fast moving blades of the turbines and in the exit region of the turbines.
What is the most common cause of pump cavitation?
Common causes of suction cavitation include: Clogged filters. Pipe blockage on the suction side. Poor piping design.
How cavitation can be eliminated in a pump?
If possible, reduce the temperature of your pump, liquid, and/or other components. Increase liquid level around the suction area. If possible, try to increase the diameter of the eye at the centre of your impeller.
What are the two types of cavitation in a vacuum pump?
There are two types of cavitation that may occur in reciprocating positive displacement applications: suction and discharge. Suction cavitation occurs ahead of the suction stroke, when the pump is starved of flow, either from being in a high-vacuum or low-pressure environment.
What is Discharge cavitation and what causes it?
Discharge cavitation occurs when pressure at the discharge end of the pump is too high. High discharge pressure limits the volume of fluid flowing out of the pump, causing high-velocity fluid to recirculate between pump impeller and housing, causing cavitation.
What causes recirculation cavitation in hydraulic pumps?
Recirculation cavitation is typically due to operating the pump to the left side of the pump operating curve (reduced flows) and away from the best efficiency point (BEP). The approach angle of the incoming flow does not match that of the rotating impeller inlet vane geometry.
How do I know if my pump is cavitating?
If you hear cavitation noise, the pump is likely cavitating, but just because you do not hear cavitation noise does not mean it is not cavitating. Some of the most damaging cavitation occurs at noise levels outside the audible range. I also witness many people confusing cavitation noise with turbulent or high velocity flow noises.