A Study of Aerodynamic Performance of Diffusers for Centrifugal Compressors

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概要

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• The performance of vaneless diffusers and the flow distribution discharged from the impellers of various specific speed centrifugal compressors were studied. The experimental results of eighteen different stages showed, that (1) the impeller exit flow distortion in axial direction increased with an increase in specific speed, and (2) the pressure recovery of vaneless diffusers for high specific speed compressors was extremely low compared with the value expected by an ideal two dimensional analysis. New type diffusers with half guide vanes on the shroud side wall are proposed in order to improve the pressure recovery of the diffuser under the distorted inlet flow condition. The results show that the pressure recovery of diffuser under distorted inlet flow is considerably improved by half guide vanes, and the best height of the guide vanes is a little less than one half the diffuser width.

• 一般社団法人日本機械学会の論文

著者

• KOBAYASHI Hiromi

  Mechanical Engineering Research Laboratory, Hitachi Ltd.

• KANEKI Tadashi

  Tsuchiura Works, Hitachi Ltd.

• Kobayashi Hiromi

  Mechanical Engineering Research Laboratory Hitachi Ltd.

• Kaneki Tadashi

  Tsuchiura Works Hitachi Ltd.

関連論文

• A Study of Aerodynamic Performance of Diffusers for Centrifugal Compressors

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