Design method of diffuser with dovetail front edge and integrated radial and axial blades

The invention provides a modeling method of a diffuser with a dovetail front edge and integrated radial and axial blades. The diffuser prepared through the method is provided with a tubular diffuser front edge structure, and radial diffuser blades and axial diffuser blades are integrally designed; compared with a tubular diffuser, the diffuser is convenient to model, simple to process and low in manufacturing cost; compared with a common blade diffuser, the special three-dimensional fan-shaped structure of the front edge of the blade can better cope with complex unsteady flow at an impeller outlet; meanwhile, the radial diffuser blade and the axial diffuser blade are integrally molded by adopting a smooth transition molded line at a runner part, so that the pressure ratio, the efficiency and the stable working margin of the high-pressure-ratio centrifugal compressor are greatly improved in a limited flowing space. The diffuser blade is particularly suitable for centrifugal compressors of small and medium-size