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Zou Junjie,Chen Jia,Meng Fan,Zheng Yunhao 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.2
To restrain the formation of stall, the internal fl ow structure of a high specific speed axial flow pump is predicted by transient numerical simulation. The calculated results are validated by test data. The mathematical statistical theory of standard deviation is introduced to analyze and compare the pressure fluctuation intensity ( P flu ) under the design and stall operation points. The results indicate that influenced by the large scale vortices structure within stall region , P flu inside different flow passage components increases. In terms of the spatial distribution, the P flu near the inflow pipe wall of the outlet increases from the enhancement of the impeller pre rotation effect. In the impeller channel, the flow separation vortices near the leading edge of the blade and the reflux vortices at the outlet hinder the mainstream flow and cause P flu to increase. In the guide vane channel, there are high intensity vortices near the suction side and leading edge, resulting in an increase in P flu
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