Self-circulation casing treatment device and contra-rotating gas compressor

Abstract

The invention discloses a self-circulation casing treatment device and a contra-rotating gas compressor, and belongs to the technical field of internal flow control of turbomachinery. The self-circulation casing treatment device comprises an air suction section, a bridge circuit and an air injection section, wherein the air suction section is communicated with the air injection section through the bridge circuit; an air suction port of the air suction section is positioned right above the blade top of the rear-row rotor and is in a range of 0-30% of axial chord length from the downstream of the front edge of the blade top of the rear-row rotor; the air suction port stretches across the blade top channel; the air injection section comprises two air injection openings, the first air injection opening is located within the range of 0%-40% of the local axial chord length from the upstream of the front edge of the front-row rotor blade top, and the second air injection opening is located within the range of 0%-40% of the local axial chord length from the upstream of the front edge of the rear-row rotor blade top. The self-circulation casing treatment device is applied to the contra-rotating gas compressor, the stall margin of the contra-rotating gas compressor can be greatly improved through a double-jet structure, the stall margin of the contra-rotating gas compressor can be improved under different rotating speed ratios, and the self-circulation casing treatment device has the good variable working condition characteristic.

Description

technical field [0001] The invention belongs to the technical field of internal flow control of impeller machinery, and in particular relates to a self-circulating casing processing device and a counter-rotating compressor. Background technique [0002] Large thrust-to-weight ratio and wide margin are the development direction of modern aero-engines, and reducing weight by simplifying engine structure is the easiest way to improve aero-engine thrust-to-weight ratio. Contra-rotating compressors have been paid more and more attention because of their advantages of greatly improving the working capacity of compressors and reducing their own weight. The unique advantages of the contra-rotating compressor are manifested in both structure and aerodynamics. Structurally, the cancellation of the intermediate vanes can shorten the axial size of the compressor and reduce the number of parts and total weight; the inner and outer casings of the intermediate bearings supporting the two ...

AI Technical Summary

Problems solved by technology

The single-jet self-circulating casing processing device designed based on conventional compressors has only a single air injection port, and its applicability in counter-rotating compressors is limited. Only when the self-circulating casing processing is configured on the top of the rotor blade that stalls first can it be used The role of stability expansion, when the speed ratio changes, the first stall position of the counter-rotating compressor also changes, at this time, the single-jet self-circulation casing processing device may lose the ability to expand stability

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