1111 平板ヘリカルインデューサの限界流線観察による内部流れの考察(OS11-2 流体機械の諸問題,オーガナイズドセッション)

概要

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An inducer is attached upstream of main impeller in order to improve the suction performance of turbopump. However, the internal flow of inducer is complex ; in particular, at partial flow rates, it is known that the strong inlet back flow appears with the dead water region over the hub surface inside the blade passages. In the present study, in order to clarify the internal flow of inducer, especially the boundary layer flows on the inducer surfaces, we have made visual observations of the limiting streamlines at three partial flow rates by multi-color oil-film method. As a result, the leading edge separation on the suction surface was observed at the examined flow rates and becomes more significant as the flow rate is decreased. Observed streamlines on the pressure and hub surfaces also became more complex with the decrease of the flow rate.
社団法人日本機械学会の論文
2009-11-06