Ultra-wide-chord trigonometric waveform blade

Abstract

The invention belongs to the field of fluid machinery, and relates to an ultra-wide-chord trigonometric waveform blade. The pressure surface of the blade leaf type is designed as a trigonometric tangent or cotangent waveform curve structure, and is an intercepting section intercepted from the middle part of a cycle of the tangent or cotangent waveform curve to the two ends. The tangent or cotangent waveform curve is used as a blade profile, which can make the compression of airflow in a flow channel more smooth and more efficient, so that a blade structure under the subsonic condition can be designed, and a blade structure under the supersonic condition can also be designed, and strong shock waves in a compressor flow path and the larger flow losses caused by the strong shock waves can beeffectively avoided especially under supersonic conditions. The blade provided by the invention can be widely applied in axial flow, oblique flow and centrifugal compressors, and the tangent or cotangent waveform curve can be applied to the profile design of a ramjet inlet (diffuser) and an aeroengine supersonic inlet.

Description

technical field [0001] The invention belongs to the field of fluid machinery, and relates to a blade of an impeller type air compressor, in particular to an ultra-wide chord trigonometric function waveform blade. Background technique [0002] According to the flow direction of the working medium, impeller compressors are usually divided into two types: radial flow (ie centrifugal) and axial flow. Centrifugal compressors are small in size, high in impeller speed, high in single-stage pressure ratio but slightly low in efficiency, and are usually suitable for medium and small flow occasions, and are widely used in power systems in aviation, ships and other fields. The axial flow compressor has a compact structure, is easy to install more stages, has a low single-stage pressure ratio, and has a high overall efficiency. It is usually suitable for occasions with large flow rates. [0003] The blades of the impeller compressor are usually divided into moving blades and stationary...

AI Technical Summary

Problems solved by technology

Regardless of whether it is a moving blade or a stationary blade, the blade profile design has an important impact on the efficiency of the compressor. The blade shape of the current axial flow compressor blade is usually arc-shaped, and this type of blade is usually only suitable for working in sub- For sonic and transonic speeds, as the Mach number of the working fluid flow increases, various flow losses such as separation of the boundary layer in the flow channel increase rapidly, and the efficiency usually decreases rapidly, thus limiting the further increase of the single-stage pressure ratio

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