Mine axial flow fan diffusion core barrel and optimizing and resistance reducing design method thereof

Abstract

The invention discloses a mine axial flow fan diffusion core barrel and an optimizing and resistance reducing design method thereof. The diffusion core barrel mainly comprises a cylindrical casing and an inner core body, the inner core body is formed by combining a cone and a semiellipsoid, an axial tangent plane boundary line of the cone is in tangent to an axial tangent plane boundary line of the semiellipsoid, the diffusion core barrel is of an axial symmetry structure and is coaxial with a hub. The specific shape of the diffusion core barrel is determined by 6 parameters which comprise length L of the diffusion core barrel, diameter D of the casing of the diffusion core barrel, diameter of a flow inlet end of the cone, an inclined angle a between a boundary line of the cone and the axis of the diffusion core barrel, the minor semi-axis b of the semiellipsoid and the major semi axis c of the semiellipsoid. A computational fluid dynamics method is used for calculating a plurality of groups of designed diffusion core barrel models, a model with minimum pressure loss is selected as the diffusion core barrel with optimized shape. Energy-saving efficiency of the diffusion core barrel reaches above 77%, and energy-saving effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of mine ventilators, and in particular relates to a diffusion core barrel of a mine axial flow fan and an optimization design method for reducing resistance thereof. Background technique [0002] Due to the high outlet speed of the axial flow fan, its outlet dynamic pressure is still very large, accounting for more than 30% of the total pressure. For some axial flow fans with large flow and low pressure, the outlet kinetic energy even accounts for the total pressure of the fan. About 50% of the total. Therefore, a diffuser must be provided behind the hub of the fan impeller. The function of the diffuser is to change the flow energy of the inlet air of the diffuser into pressure increase through deceleration, so as to recover part of the dynamic pressure and further improve the static pressure efficiency of the fan. [0003] The structure of the diffusion cylinder is generally composed of an outer cylinder ...

AI Technical Summary

Problems solved by technology

Both diffusion cores can improve the flow field at the rear of the impeller hub, but there is still the problem of disordered flow field at the tail of the diffusion core, and the local resistance loss is still relatively large

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