Abstract
Cavitation phenomenon always occurs in gerotor pumps. Bubble fraction of oil has remarkable influence in bearing lubricating characteristic. Oil mass flow rate and density is measured in a gerotor oil pump performance test, bubble fraction is analyzed based on measured oil density. Experimental results show that bubble volume fraction linearly decrease with the increasing of outlet pressure at constant pump speed. With the increasing of pump speed, influence of outlet pressure on bubble mass fraction decreases gradually. In the driving cycles, bubble mass fraction also increases with the increase of pump outlet pressure, and has a closely positive correlation with oil flow and pump speed. When the temperature of lubricating oil rises from 25°C to 100°C, the average volume fraction decreases about 72.6%, and the average mass fraction decreases about 84.3%. The changing rate of oil bubble fraction apparently lags behind the pump speed, it means that oil bubble fraction in acceleration stage is much higher than deceleration stage.
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