Severe Cavitation Erosion Research Articles

Behavior of Severe Cavitation Erosion Occurring in a High-Specific-Speed Centrifugal Pump due to Vibrations and Noise.

In order to study the behavior of severe cavitation erosion occurring in a typical centrifugal pump with a high specific speed of Ns = 300 (m, m3/min, rpm), the high-frequency vibrations and noises due to such cavitation erosion are systematically investigated under various test conditions. The present erosion tests are carried out using three-dimensional impellers made of aluminum alloy. In a field where the flow rates as well as NPSH are low, the vibrating accelerations and the acoustic power sharply increase, so that severe erosion takes place in this field. A large difference in flow pattern is clearly observed with respect to the flow rate.

キャビテーション・エロージョンに対する腐食抑制剤の効果

Severe cavitation-erosion has often been experienced at the cooling water side of some diesel engine cylinder liners.To protect against the erosion various protective methods have been tried.In this paper, the accelerated Cavitation-erosion tests were made under the addition of various corrosion inhibitors such as emulsified oils, chromates, nitrites, and organic amine-inhibitor into rfesh water, and also the potential of test pieces was measured under cavitation conditions.Inhibited water could reduce the erosion loss by half to quarter when compared with noninhibited one.From the results of potential measurement during the cavitation test periods, the inhibitive effect of these inhibitors on cavitation-erosion was considered to be due to the formation of adsorbed films which increased the original cavitation-erosion resistance.