G0501-6-4 遠心圧縮機ディフューザ前縁に発生する前縁渦の挙動(回転機械)

概要

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The effects of behavior of leading-edge vortex, which exists on the suction surface of the diffuser vane, on flow fields in centrifugal compressor are discussed by experiments and CFD technique. The focus of the research is to investigate the behavior of the leading-edge vortex at low-flow rate operation. The leading-edge vortex becomes large by about 80% of diffuser width under the low-flow rate conditions. According to numerical analysis, the internal flow in the diffuser passages is complicated with bubble type vortex break down of the leading-edge vortex, and the main stream in diffuser passages is blocked by the vortex. Therefore, the vortex is considered to cause a loss of diffuser passages of the centrifugal compressor. Furthermore, diffuser stall is considered to develop due to the leading-edge vortex pushed upstream to the impeller direction.
2009-09-12