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

Abstract

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-sized aero-engines and micro gas turbines.

Description

technical field [0001] The invention provides a diffuser design method with a tubular diffuser dovetail leading edge structure and integrated radial and axial diffuser blades, the diffuser is combined with a tubular diffuser And the advantages of vane diffuser shape: Compared with the tube diffuser, the vane diffuser is convenient in shape, simple in processing, and low in cost; compared with the general vane diffuser, its special three-dimensional fan shape The structure can better cope with the complex unsteady flow at the outlet of the impeller; at the same time, the radial and axial diffuser blades are integrated with a certain curvature line in the flow channel, thereby greatly improving the flow rate in the limited flow space. High pressure ratio centrifugal compressor pressure ratio, efficiency and stable working margin, especially suitable for small and medium-sized aeroengines and centrifugal compressor components of micro gas turbines. Background technique [0002...

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Problems solved by technology

However, the vane diffuser disclosed in this patent also has deficiencies, mainly in that the cross-section of the channel is elliptical, which leads to a strengthening of the vortex strength of the channel; , it is impossible to finely control the flow only by the roulette wheel cover, the flow is more chaotic, and the loss is greater

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