Diffusers for centrifugal compressors

Abstract

The invention discloses a diffuser of a centrifugal compressor. Improving the structure of the diffuser and further improving its working performance have important application value. In the present invention, a short blade is arranged in the flow channel of two adjacent long blades; the leading edge of the long blade is a curved surface and is inclined, and the angle between the leading edge line and the central axis of the wheel disc is 6-8°; the curvature of the leading edge of the long blade is The radius gradually increases along the direction from the wheel disc to the wheel cover; the long blade is provided with three broken-line grooves passing through the pressure surface and the suction surface; the trailing edge of the long blade is located on the pressure surface with a trailing edge tip. In the present invention, the short blades located in the flow channels of adjacent long blades suppress the occurrence of airflow separation on the blade surface; the zigzag channel reduces the pressure difference between the pressure surface and the suction surface, reduces the reverse pressure gradient, and effectively blows off the suction surface of some blade tails. The surface layer separates the airflow; the parabolic winglet at the trailing edge can inhibit the growth of the wingtip vortex generated by the pressure difference between the suction surface and the pressure surface of the trailing edge of the traditional airfoil blade.

Description

technical field

[0001] The invention belongs to the field of ventilation equipment, and relates to a centrifugal fan, in particular to a diffuser of a centrifugal compressor. Background technique

[0002] As an energy conversion device, the centrifugal compressor mainly drives the movement of the gas in the impeller channel through the rotation of the impeller, and converts the mechanical energy of the prime mover into the energy of the gas. Due to its high pressure, wide range of stable working conditions, simple structure, and easy maintenance, centrifugal compressors are widely used in industries such as petroleum, aerospace, metallurgy, chemicals, and mines, and play an important role.

[0003] In centrifugal compressors, the diffuser is generally divided into two types: vaneless diffuser and bladed diffuser. The vaneless diffuser is usually composed of two flat walls forming an annular channel. The structure of the vaneless diffuser is simple, the cost is low, the per...

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