2002•Journal of Propulsion TechnologyOpen access

Design and experimental investigation on a new grooved treated casing with for ward-step in an axial-flow compressor

Zhiwei Liu

Abstract

A new kind of grooved treated casing with forward-step was designed and tested on a rig of single stage axial-flow compressor. The main geometrical parameters, such as forward-step structure, the grooved structure, the forward-step clearance and the shape of tip clearance were studied respectively and their effects on efficiency and stall margin of the compressor were analyzed. The experimental results indicate that the forward-step clearance and the shape of tip clearance have strong effect on performance of the compressor. The mechanism that grooved treated casing with forward-step raises the stall margin was analyzed.

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Key concepts: Tip clearance, Gas compressor, Casing, Stall (fluid mechanics), Axial compressor, Materials science, Mechanics, Margin (machine learning)