Rapid construction method for single-channel fluid computational domain of turbomachinery

The invention discloses a rapid construction method for a single-channel fluid computational domain of turbomachinery. The method comprises the following steps: specifying a key surface; creating a whole-cycle impeller fluid domain; sampling points are generated in a meridian plane of the turbomachinery according to a certain spatial resolution; rotating each sampling point around a rotating shaft, creating a space arc, and calculating intersection points of all the space arcs and the specified blade surface; constructing a curved surface by a grid formed by all the intersection points, generating a blade mid-plane, and then extending the blade mid-plane to the key plane to obtain a reference segmentation plane; rotating the reference split surface twice around a rotating shaft to generate a first periodic split surface and a second periodic split surface; and segmenting the whole-cycle impeller fluid domain by adopting the first and second cycle segmentation surfaces to obtain a single-channel blade calculat