Two-way axial-flow pump impeller based on inclined V symmetrical wing type and design method for two-way axial-flow pump impeller

Abstract

The invention discloses a two-way axial-flow pump impeller based on an inclined V symmetrical wing type and a design method for the two-way axial-flow pump impeller, and belongs to the technical field of hydraulic engineering. The impeller comprises blades and a hub; wheel rim diameter of the impeller is 300 mm; a hub ratio is 0.4667; the four blades are uniformly distributed in the peripheral direction of the hub; wing types of the blades are inclined V symmetrical wing types; center lines of single-sided wing types of the blade wing types are in the shape of inclined V; maximum thickness of a hub side wing type is 12 mm; maximum thickness of a wheel rim side wing type is 6 mm; and section of a middle wing type is linearly changed according to the maximum thickness. A design method for the impeller comprises the following steps of: step A: designing a two-way axial-flow pump wing type; and step B: designing a two-way axial-flow pump impeller. The optimal point of cavitation performance of the two-way axial-flow pump adopting the inclined V symmetrical wing type design is close to a zero-head working condition point; and the optimal point of the cavitation performance of a common one-way pump is close to an efficient point. At the efficient point, the cavitation performance of the two-way pump adopting the inclined V wing type reaches the level of the one-way pump.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and relates to an axial flow pump impeller and a design method thereof, in particular to a bidirectional axial flow pump impeller based on an oblique V symmetrical airfoil and a design method thereof. Background technique [0002] Most of the pumping station projects on the east route of the South-to-North Water Diversion Project use axial flow pumps due to their low head. Many of these pumping station projects need to take into account the drainage requirements while pumping water, so as to realize the reverse pumping function of the pumping station. The traditional one-way pump is used for reverse pumping, the impeller is in the reverse arch state, the energy performance and cavitation performance of reverse operation are greatly reduced, and the severe shedding phenomenon of the impeller and guide vane blades causes severe cavitation, vibration and noise, threatening The...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of existing bidirectional axial flow pump airfoils such as poor flow around, serious blade shedding, and poor cavitation performance, the present invention proposes a bidirectional axial flow pump impeller and its design method based on oblique V symmetrical airfoils, which can take both Reverse performance requirements, suitable for low head pumping station operation, energy performance and cavitation performance can be further improved

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