Abstract：On the basis of experimental study of cavitation erosion,silt abrasion and their synergetic erosion on hydrofoil,the mechanism of silt abrasion enhanced by cavitation in hydraulic machinery was analyzed combined with the testing and processing of cavitation structure in silt laden water flow.The erosion patterns were obtained by the contrastive analysis of microscopic appearance in different positions of the hydrofoil surface on three testing conditions and the flow factors which cause different erosion patterns were determined.The characteristics and law of behaviors of cavitation structure on hydrofoil were obtained by analysis and processing of cavitation structure images.The different mechanisms of silt abrasion enhanced by cavitation at the two stages of development of cavitation cavity and collapse of cavitation cloud are put forward by the analysis of erosion patterns and cavitation behaviors on hydrofoil.During the cavitation development stage,the silt particles are accelerated by cavitation cavity.During the cavitation cloud collapse stage,the silt particles are accelerated heavily by pressure wave or micro-jet.The synergetic erosion ability is strengthened by the actions on particles during the two stages.The viewpoints were verified by the experimental results of erosion depth of silt abrasion and their synergetic erosion on hydrofoil
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