低比速度ディフューザポンプ段落の三次元流れ : 段落定常流れ解析と可視化による考察 (<小特集>タ-ボ機械の内部流れと定常・否定常特性)

概要

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A viscous stage calculation method was used for investigating complex three-dimensional flow phenomena, particularly under off-design operating conditions, occurring in a low-specific-speed diffuser pump stage with a centrifugal impeller and a vaned bowl diffuser. The incompressible version of Dawes three-dimensional Navier-Stokes code was extended for the stage calculation by introducing an inter-row mixing process proposed by Denton. The numerical prediction succeeded in predicting major flow patterns obtained by a multicolor oil-film flow visualization technique which featured the use of tri-primary-color fluorescent powder as pigment. The meridional and blade-to-blade secondary flows, including the inpeller inlet recirculation at the shroud side, the diffuser inlet recirculation at the hub side, and the formation of the extensive vortex on the diffuser hub surface, were investigated numerically and experimentally in detail. The flow mechanism leading to the onset of impeller inlet recirculation was also discussed in detail.
社団法人日本機械学会の論文
1995-11-25