Two-dimensional flow simulation method for turbomachinery based on two-surface flow theory

The invention discloses a two-dimensional flow simulation method for turbomachinery based on a two-surface flow theory. The method comprises the following specific steps of performing mesh division onan S1 surface, and meanwhile enabling a user to self-define the number of mesh nodes; solving a curvature on each node position according to a mesh node position coordinate, solving a fluid domain ofthe S1 surface, calculating a flow rate on each node position, repositioning each node position according to whether the flow rate on each node position is completely in line with the flow rates of real flow surfaces, and continuously solving the fluid domain of the S1 surface and the flow rate on each node position after the flow surface is repositioned until the flow rate on each node positionis completely in line with the flow rates of the real flow surfaces; solving the node positions according to the S1 surface, optionally selecting one real flow surface on the S1 surface to perform mesh division, wherein a thick