Pressure expander based on fractal blades

Abstract

The invention provides a pressure expander based on fractal blades. The pressure expander comprises an upper cover plate, a lower cover plate and a fractal blade group, wherein the fractal blade group is arranged between the upper cover plate and the lower cover plate in a clamping manner; a gas flow channel is formed among the upper cover plate, the lower cover plate and the fractal blade group; and after passing through the gas flow channel, the pressure of a gas flow is enlarged. The multi-stage fractal blades of the pressure expander disclosed by the invention can restrain flow separation, reduce flow blockage and flow loss, and improve the pressure expanding capacity and the pressure expanding efficiency of the pressure expander are improved, so that improvement of the efficiency of the whole machine, the reduction of the size of the whole machine and increase of the thrust-weight ratio / power-weight ratio are facilitated, the pressure expander disclosed by the invention is convenient to process and low in manufacturing cost, and can be directly mounted on a pressure expanding section of a centrifugal compressor, and the modifying and the upgrading of the compressor are facilitated.

Description

technical field [0001] The invention relates to the technical field of gas compression devices, in particular to a diffuser based on fractal blades, which is especially suitable for various devices with centrifugal gas compressors, such as aviation gas turbines, power generation gas turbines, and air-conditioning compressors. Background technique [0002] The centrifugal compressor is an important component in most small gas turbines and turboshaft engines, consisting of an impeller and a diffuser. The role of the diffuser is not only to convert the kinetic energy of the centrifugal impeller rotation into the airflow energy into pressure potential energy, but also to twist the high-speed airflow with radial and tangential velocities flowing out of the centrifugal impeller into pure axial airflow as much as possible through the blades. supplied to the combustion chamber for combustion. The performance of the diffuser directly affects the working state of the compressor stage...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing vane diffuser is that due to the presence of vanes, the throat of the vane diffuser is prone to blockage, and the impact loss of the vane diffuser is large under variable working conditions, and the efficiency drops significantly, especially in In the case of a large angle of attack, severe separation is likely to occur in the flow channel, and even lead to surge

However, in the case of small flow, the flow in the vane diffuser often deteriorates first, which causes the surge of the whole machine

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