Cavitation erosion is found in diesel engines. It occurs on the external wall of the wet cylinder liners. The degree and amount of decay or erosion and its type and distribution on the affected areas can differ from engine to engine and from cylinder to cylinder within the same engine.
The erosion can penetrate the cylinder wall and allow the flow of coolant to the oil and vise versa. The cavitation erosion in cylinder liners occurs due to excess in harmonic abrasion of the engine and in few cases, loose fitting liners can also cause fast formation and implosion of small vapor bubbles into the coolant that hits the wall of cylinder wall.
The vibration happens as the piston moves up and down in the cylinder especially on the thrust area in the liner. In other words, the sleeve wall comes in contact with coolant moves faster inwardly and outwardly and generates vapors. Small bubbles formed during this process implode or collapse and create shock waves against the wall.
Professionals are still working and searching affordable solution that would prevent cavitation erosion. However, there are a few coatings that can be applied on the liners to postpone cavitation erosion.
How to prevent cavitation erosion?
Manufacturers are taking following measures to reduce or prevent cavitation issue-
You can avoid the cavitation situation by reducing harmonic vibrations. For instance, you can ensure the compatibility of the injection. They should match the specifications shared by manufacturers. You must handle the engine speed accordingly. You should not underestimate the significance of correct clearances between cylinder and liner blocks. Poor fitting liner is a contributor to vibration that further causes cavitation erosion.
Always use specific additives for the coolant as per the guidance of your cylinder liners manufacturers. These additives will protect the liners and reduce the chances of cavitation.
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