Shape-maintaining diffuser integrating radial diffuser and axial diffuser

Abstract

The invention discloses a shape-maintaining diffuser integrating a radial diffuser and an axial diffuser. The diffuser is particularly suitable for an aviation centrifugal compressor with limited radial and axial sizes. The shape-maintaining diffuse has the following two key technologies: 1, a radial section, a turning section and an axial section of the blade diffuser are integrally designed; and 2, the radial section of the diffuser is similar to a wedge-shaped diffuser, from the turning section, a part of the blades and an inner casing begin to be fused with each other, and finally, the part of the blades are converted into the inner casing, and the radial wall surface is converted into the blade surface. By the adoption of the design mode, the diffuser can ensure that the airflow direction is converted from the radial direction to the axial direction under the condition that the radial size and the axial size are restrained, and each section of the diffuser can have the good diffusion degree, so that the airflow cannot be separated in a flow channel, the flow loss in the diffuser is reduced, and the overall performance of the compressor is improved.

Description

technical field [0001] The patent of the invention belongs to the technical field of centrifugal compressors, and relates to a novel diffuser structure. Through the fusion of radial blades and axial blades, the structure can quickly change the air flow direction from radial to axial, and is especially suitable for aviation centrifugal compressors with limited radial dimensions. Background technique [0002] With the increasing thrust-to-weight ratio of aero-engines, the compact high-pressure ratio centrifugal compressor has attracted extensive attention. The higher the pressure ratio of the centrifugal compressor, the higher the Mach number of the outlet flow of the centrifugal impeller. The high Mach number incoming flow brings severe challenges to diffuser design, especially when the radial size of the unit is limited. [0003] In the prior art, the radial section, the turning section and the axial section of the diffuser are also integrally constructed in the micro cent...

AI Technical Summary

Problems solved by technology

However, due to this fusion method, the diffuser itself cannot have too long radial blades, so the ratio of the inlet diameter of the diffuser must be controlled below 1.3, which limits its application range

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