Radial single raw blade diffuser

Abstract

The invention relates to a radial single-row vane diffuser in eccentric pressure machine technology. At the front part of the vane inlet, along the flowing direction of the flow, it has flow slot seam structure on the front surface and the back surface. The boarder flow on the seamed vane surface can be controlled effectively through the ejection blow or extraction to the slot seam flow, it can be maintained with excellent by-pass state in a large working state range, upgrades the performance of the eccentric pressure fan greatly, upgrades the efficiency, enlarges the high efficiency area and the flow change range of the stable working area. The invention can be used to the radial single-row vane diffuser independently; it also can be applied to form a double-row or multi-row radial series vane diffuser.

Description

technical field [0001] The invention relates to a radial single-row vane diffuser in centrifugal compressor technology. Background technique [0002] There are two basic types of radial vane diffuser structures in centrifugal compressors: vaneless diffuser and vane diffuser. Compared with the vaneless diffuser, the main advantages of the vane diffuser are: the isentropic efficiency of the compressor stage under the design condition is higher (about 3-5%), the radial dimension is smaller, and the impeller outlet It can still work with high efficiency when the absolute outflow angle of the airflow is small; its disadvantage is that it has poor adaptability to changes in working conditions. This is because when the working condition changes, the airflow inflow angle at the blade inlet changes accordingly. In this way, when the actual operating condition deviates from the design operating condition, the airflow angle α at the blade inlet will be 3 Blade inlet geometric angle ...

AI Technical Summary

Problems solved by technology

Compared with the vaneless diffuser, the main advantages of the vane diffuser are: the isentropic efficiency of the compressor stage under the design condition is higher (about 3-5%), the radial dimension is smaller, and the impeller outlet It can still work with high efficiency when the absolute outflow angle of the airflow is small; its disadvantage is: poor adaptability to changes in working conditions

The defect and insufficiency of US Patent US5383764A is that the mechanism of slotted blades controlling boundary layer flow separation has not been studied in depth and carefully on the different influences of the angle of attack produced by the change of different working conditions on the flow around the cascade of the bladed diffuser, and according to This provides a reasonable selection scheme for the slot structure type, number of slots, shape and size of the slots, and the position of the slots in the diffuser blade under different variable working conditions, so as to implement the boundary layer flow more effectively separate control

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