Unsteady standing vortex type treatment casing

Abstract

The invention relates to a treatment casing applied to an axial-flow air compressor in the field of impeller machinery, in particular to an unsteady standing vortex type treatment casing, which can be used for improving the stability margin of the axial-flow air compressor without reducing efficiency. The unsteady standing vortex type treatment casing comprises an air jet groove, a bridge-type air flow channel and an air suction groove, wherein the air jet groove is arranged at the position of a suction surface of a blade, and the air suction groove is arranged at the position of a pressure surface of the blade. The treatment casing is designed to suppress leakage flow generated on the suction surface of a front edge of the blade, the air suction groove is exactly close to the pressure surface in the rear middle of the blade when the blade sweeps over, and the air jet groove is close to the suction surface of the front edge of the blade. Therefore, differential pressure is formed between the air suction groove and the air jet groove to drive fluids to spray from the downstream of the blade to the upstream of the blade, and the air jet groove is positioned close to the suction surface of the front edge of the blade and exactly aligned to a leakage vortex generating area of the blade, so that leakage flow can be suppressed, and further the stall margin of the air compressor is increased. Moreover, as an air jet direction is consistent with a main flow direction, mixing loss of an air jet area and a main flow area is decreased, the momentum of a boundary layer of the wall surface of the casing is increased, and positive effects are achieved for the efficiency of the air compressor.

Description

technical field [0001] The invention relates to a processing casing of an axial flow compressor applied in the field of turbomachinery, in particular to an unsteady resident scroll type processing casing which can improve the stability margin of the axial flow compressor without reducing efficiency. Background technique [0002] Axial flow compressors are widely used in the field of turbomachines, and have the characteristics of high efficiency and high power, but their stable working range is often small, and unstable working phenomena such as rotating stall and surge are prone to occur under small flow conditions. The pressure ratio and efficiency of the compressor will drop sharply and cannot work, and in severe cases, the compressor will be damaged directly. Therefore, people have adopted many different methods to delay and suppress the occurrence of compressor rotation stall and surge, so as to expand its stable working range. [0003] As a passive compressor stability...

AI Technical Summary

Problems solved by technology

However, the angle of the traditional processing casing when the gas is ejected from the upstream is often opposite to the flow direction of the main flow area, which increases the flow mixing loss, making the processing casing expand and stabilize while reducing the pressure. machine efficiency

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