Design method for nonadjustable axial flow pump impeller with characteristic of long blades and short blades

Abstract

The invention discloses a design method for a nonadjustable axial flow pump impeller with the characteristic of long blades and short blades. The method specially comprises the following steps that three-dimensional blade profiles of the long blades of the nonadjustable axial flow pump impeller are designed according to a streamline method; three-dimensional blade profiles of the short blades of the nonadjustable axial flow pump impeller are designed according to parameters of the designed three-dimensional blade profiles of the long blades; the designed short blades are arranged in the middles of flow channels formed by every two adjacent long blades at intervals, and the nonadjustable axial flow pump impeller with the characteristic of the long blades and the short blades is obtained. The problem of unstable fluid conveying caused by flow separation and swirling flow at the intersection of the suction surfaces of blades and a wheel hub near an outlet of an axial flow pump impeller during operation of the axial flow pump impeller is solved.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and engineering equipment, and relates to a design method of a non-adjustable axial flow pump impeller with long and short blade characteristics. Background technique [0002] Small non-adjustable axial flow pumps are widely used in small-scale water lifting and drainage and irrigation in fishery and farmland, and the impeller of the axial flow pump is the core component of the small axial flow pump device, and its performance directly determines the performance of the entire pump device. At the same time, the small shaft The impeller of the flow pump can also be installed at the inlet of the impeller of the centrifugal pump. As a short-pitch inducer, it can play the role of pre-pressurization and improve the NPSH of the centrifugal pump. Therefore, it is of great significance to improve and improve the performance of the impeller of the small axial flow pump. [0003] However, during the ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a design method for the non-adjustable axial flow pump impeller with long and short blade characteristics, which solves the problem of outflow and vortex at the intersection of the blade suction surface and the hub near the axial flow pump impeller outlet during the operation of the axial flow pump impeller. , resulting in unstable fluid delivery

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