G0500-5-2 テーパ形案内羽根を有する遠心圧縮機の動静翼間距離が性能・騒音に与える影響([G0500-5]流体工学部門一般講演(5))

概要

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The purpose of this research is to investigate the effects of tapered diffuser vane, which is installed into a centrifugal compressor with shortened impeller-diffuser distance, on compressor performance and radiated noise by experiments. In addition to shortening the length, a half of the original impeller-diffuser distance, diffuser vanes were placed on three variant inlet angle positions. The noise measurements show shortening impeller-diffuser distance enlarged radiated noise but changing inlet angles little influenced to noise. However in compressor performance, in the case of setting tapered diffuser vanes on the small inlet angle position, compressor performance improved 2.24% at designed flow-rate operation and stable operation range enlarged 30% compared with original diffuser setting The oil-film method at diffuser leading edge revealed that these remarkable improvements in compressor performance are caused by tapered diffuser vane. Tapered region suppresses the leading edge vortex growth that blocks the main stream into diffuser passages and causes a loss of a centrifugal compressor.
一般社団法人日本機械学会の論文
2010-09-04