Analysis of Cavitation Phenomena in Pumps and Its Hazards
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作者:佚名
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Time：2025-10-10
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Cavitation occurs when localized pressure within a pump falls below the saturated vapor pressure of the medium, causing bubbles to form and collapse. This phenomenon can severely damage equipment and impair operational efficiency.
1. Core Principle of Cavitation
During pump operation, increased flow velocity at the impeller inlet causes pressure reduction.
When local pressure drops to the saturated vapor pressure of the medium (e.g., water), the medium vaporizes, forming numerous bubbles.
As these bubbles travel with the water flow into high-pressure zones, they rapidly collapse and rupture, generating intense hydraulic shocks and shock waves.
2. Primary Hazards of Cavitation
Component Damage: The repeated impact force from bubble collapse strikes metal surfaces like impellers and pump casings, causing pitting and erosion. Severe cases may lead to impeller perforation or fracture.
Efficiency Reduction: Bubbles occupy flow path space, disrupting fluid continuity. This significantly reduces pump flow rate and head while increasing energy consumption.
Abnormal Noise and Vibration: High-frequency impacts from bubble collapse trigger intense pump vibration accompanied by “clattering” sounds, compromising equipment stability.
Reduced Lifespan: Prolonged cavitation accelerates component fatigue and corrosion, drastically shortening pump service life and increasing maintenance costs.
