Multi-grade centrifugal pump guide vane hydraulic design method of high matching of inner and outer edge flow lines of blade

Abstract

The invention belongs to the field of fluid mechanical design and particularly discloses a multi-grade centrifugal pump guide vane hydraulic design method of high matching of inner and outer edge flow lines of a blade. The process of the multi-grade centrifugal pump guide vane hydraulic design method comprises the following steps: determining main geometrical parameters of a multi-grade centrifugal pump guide vane; designing the inner and outer edge flow lines of a transition section as a concentric circle; carrying out same-original-point and equal-angle ray equal division on the transition section of the outer edge flow line; measuring each section of arc length on the transition section of a corresponding outer edge mold line and the average radius of each section on the transition section of the outer edge flow line respectively, and calculating a wrapping angle corresponding to each section of the arc length on the transition section of the outer edge flow line; designing the inner edge flow line of the blade by adopting a wrapping angle two-wing conversion method; introducing a deviation coefficient lambda and calculating theoretical lengths of an inlet section and an outlet section of the inner edge flow line; and drawing a blade axial plane graph of the multi-grade centrifugal pump guide vane. The multi-grade centrifugal pump guide vane hydraulic design method not only provides supports for mathematical theory, but also improves the matching effect of the inner and outer edge flow lines of the blade of the multi-grade centrifugal pump guide vane; and the inner hydraulic loss can also be effectively reduced and the operation efficiency is further improved.

Description

technical field [0001] The invention belongs to the field of fluid machinery design, and in particular relates to a hydraulic design method for a guide vane of a multistage centrifugal pump with highly matched streamlines on the inner and outer edges of the vane. Background technique [0002] The guide vanes are designed to connect the upper and lower impellers of the hydraulic machinery, and can also be arranged at the inlet or outlet to improve the internal flow state of the hydraulic machinery. Therefore, no matter what kind of hydraulic machinery can improve its internal flow state and reduce hydraulic loss through guide vanes. However, in the design process of traditional multistage centrifugal pumps, the matching of the inner and outer edge streamlines of the guide vane blades has not been considered. The inner and outer edge streamlines of the guide vane blades are designed separately, and deviations and distortions often occur And other problems, and the design is o...

AI Technical Summary

Problems solved by technology

However, in the design process of traditional multistage centrifugal pumps, the matching of the inner and outer edge streamlines of the guide vane blades has not been considered. The inner and outer edge streamlines of the guide vane blades are designed separately, and deviations and distortions often occur and other problems, and the design is often only aimed at the inner and outer edge streamlines of the guide vane blades, without the support of scientific mathematical theories and models

[0003] So far, there has been no public report on the hydraulic design method of guide vanes of multistage centrifugal pumps matching the inner and outer edge streamlines of the blades

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