Gas turbine compressor casing anti-surge structure and surge margin evaluation method thereof

Abstract

The invention discloses a gas turbine compressor casing anti-surge structure and a surge margin evaluation method thereof. The gas turbine compressor casing anti-surge structure comprises a compressorcasing, wherein a casing treatment section is arranged on the front portion of the compressor casing, the casing treatment section comprises an anti-flow-loss section inner cavity, an anti-flow-losssection inner ring is arranged on the inner side of the anti-flow-loss section inner cavity, an axial chute is formed in the anti-flow-loss section inner ring and communicates with a backflow cavity in the anti-flow-loss section inner cavity, and a radial baffle is arranged in the anti-flow-loss section inner cavity; the axial chute rotates by 90 degrees along the radius line of the circle where the axial chute is located, is parallel to the blade chord line of a rotor blade, and rotates by 45 degrees along the axis of the circle where the axial chute is located; by changing the structure of the axial chute, the air inlet amount and the air inlet flowing condition are changed; and meanwhile, an exhaust section is optimized, the axial speed is increased, the flow coefficient is increased, the flowing state with the too large top attack angle is improved, stability expansion is effectively carried out, and the beneficial effects of effectively reducing the increased air amount, reducingthe attack angle at the blade tip of a movable blade and reducing the flow of a stall point are achieved.

Description

technical field [0001] The invention relates to the technical field of fluid mechanical compressors, in particular to a gas turbine compressor casing anti-surge structure and a surge margin evaluation method thereof. Background technique [0002] Axial fan / compressor, as a widely used fluid machine, how to improve its working stability has always been a hot and difficult point of calculation. Internationally, various explorations have been made on the stability expansion measures to improve the stability margin, mainly including adjustable Blades, casing treatment (circumferential grooves and axial slots), tip jets, large and small blades, etc.; casing treatment, as an effective passive stabilization measure, appeared in the 1960s because of its simple structure and easy installation , the expansion effect is good, and it has been widely calculated and applied; for many years, the expansion mechanism and design method of casing processing have been a hot and difficult proble...

AI Technical Summary

Problems solved by technology

[0003] The main function of compressor casing treatment is to reduce the flow rate at the stall point, thereby increasing the surge margin of the compressor. However, in the process of casing treatment in the existing casing structure, there is an air intake in the intake section. Smaller, the increase in the axial velocity of the exhaust section is small;

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