Method for widening stable working range of high-load axial flow gas compressor

Abstract

The invention relates to a method for widening the stable working range of a high-load axial flow gas compressor, a back cavity perforated plate type casing treatment with controllable casing treatment parameters is firstly designed, then self-learning of control laws is carried out, then the stability enhancement effect under different combination states of casing treatment parameters can be determined, and a database for processing the control laws of the casing treatment is further established; and the controllable parameters of the casting treatment can be adjusted according to the database of the control laws by monitoring the working state parameter of the gas compressor in a real-time manner, thereby ensuring that the demand on stall margin of the gas compressor system in the all-rotational speed range can be met, and realizing stable work. By adopting the method, the stable working range of the high-load axial flow / gas compressor can be controlled, not only the demand on the margin of the high-load axial flow gas compressor under different working states can be met, but also a new way for stall and surge control of a future intelligent aeroengine is provided for selection.

Description

technical field [0001] The invention relates to a method for widening the stable operation range of a high-load axial flow compressor, which belongs to the technical field of impellers. Background technique [0002] In the design of the axial flow compressor, the single-stage pressure ratio reaches above 2.0, and the boost ratio of the whole machine even reaches above 25, so it has a high load factor, so it is called a high-load axial flow compressor. Because of its high load factor, it is easier to cause the compressor's stable working range to be small, and it is necessary to conduct research on expanding the stable working range. [0003] The aerodynamic and thermal process of aero-engine is very complex and changes with the change of environmental conditions and working conditions. In order to make it run stably and reliably under any working conditions and make full use of its performance, it is necessary to control possible unstable working conditions and avoid danger...

AI Technical Summary

Problems solved by technology

The fundamental reason why it is in trouble is that its research idea is to study the stability of the compressor through feedback control, treat the compressor system and the control system as two separate systems, and try to apply feedback to the compressor system through the control system To change its system evolution behavior, this will inevitably lead to the problem of time delay, and this is precisely the crux of the current deadlock in active control! So, is there another way to affect the stall precursor? First of all, it needs to be clear that unsteady methods must be adopted to control stall precursors, which cannot be achieved by steady methods.

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