Abstract
In an axial piston pump made of acrylic resin, cavitation is observed by the naked eye with a strobo-scope and by high speed photography, and the pressure changes in the cylinder are measured. The cavitation is classified into the following two groups ; one, related to the trapping phenomenon, can be prevented by a suitable design of valve plates, while the other, not related to the trapping phenomenon, is mainly observed in shear layers after the contraction and/or the enlargement of flow passages. In this case, the minimum measurable cylinder pressure corresponding to the appearance of a shock pressure is less than 10 kPa. The cavitation is also studied in a water-glycol hydraulic fluid.
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