Evolutional rule of wear trace wavelength and wave hollow from calculation of boundary layer parameter are deduced. A new thread of researches in erosion wear is provided.

通过对边界层参数的计算推论磨痕波长和波深演变规律，提出了冲蚀磨损机理新的研究思路。

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According to the analysis on the boundary layer separation condition, parameter equation of vane curve for centrifugal pump is established.

通过对压力面边界层分离条件的分析得出叶片型线方程并给出计算实例。

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