Experimental research of circumferential total pressure distortion is conducted in a low-speed fan with emphasis on the compressor stability, and the stall margin improvement with a kind of stall precursor-suppressed (SPS) casing treatment. Some results on compressor stall margin enhancement and pre-stall behaviour under the restriction of circumferential total pressure distortion are presented. The results show that the SPS casing treatment can improve the compressor stall margin (6%-8%) in the condition of different distortion degrees. The experiment results also show that the mechanism of the stall margin improvement with such casing treatment is associated with delaying the nonlinear development of the stall precursor waves and weakening the unsteady flow disturbances in a compression system.
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