Criteria for the judgment of cavitation
Cavitation bubbles from the inlet edge of the blade began to appear (inception cavitation.NPSH) until the definition of the maximum bubble length, (such as the length of the bubble 5mm). In the bubble observation experiment, the inlet pressure gradually decreases, until the first visible cavitation bubble appears.
And pump cavitation phenomenon may by the cavitation cause head (] h) decreased, reaching definitions the biggest drop in value] H=0.03H or in some high-speed operation of the screw pump often appear] H=O.OOH (referring to produce cavitation head drop in the initial stage of). Corresponding NPSH numerical value with NPSH. As well as NPSH. To express.
Efficiency, pump cavitation phenomenon may by the cavitation cause (delta ETA) decreased, reaching a definition of the biggest drop in value (such as delta ETA = 0. 03.).
- pump cavitation phenomenon may be caused by the cavitation head (H) decreased, resulting in head failure (gap).
-Pump cavitation may be caused by cavitation of the material corrosion of the spiral case to reach a fixed period of time defined the maximum extent.
-Water pump cavitation may be caused by cavitation noise levels increase, to achieve the maximum defined noise level.
