The conception of wetted perimeter in the design of pump was introduced, the quality of the meridional contour was assessed by calculating the wetted perimeter area change with center stream-line.

• 引入了水泵中广泛采用的过水断面的概念，通过过流断面随流道中心流线的变化曲线判断子午型线的优劣，并实时修改以获取新的子午型线。