Erosion prediction method and erosion prediction system, erosion characteristic database used for the prediction, and its construction method

摘要

To provide an erosion characteristics database and a method for constructing the same, an erosion prediction method and an erosion prediction system using the database for predicting a widespread erosion amount of a fluid machine or the like in a short time without the need for an operation of a model machine or an actual machine. A method for predicting erosion of a fluid machine surface due to cavitation, the method including: calculating erosion intensity distribution in each area of the fluid machine surface from cavitation flow field characteristics obtained using cavitation CFD in a flow path formed by the fluid machine; determining radius distribution and center position distribution of a representative sphere and the number of shape deformations by the representative sphere for assuming an erosion surface having a porous surface property based on the erosion intensity distribution; determining a fluid machine surface to be predicted as an approximate erosion surface; and calculating a shape after deformation of the approximate erosion surface based on the radius distribution and the center position of the representative sphere and the number of shape deformations by the representative sphere.