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- W4308016770 abstract "The self-excited vibration of runner is an important factor affecting the stable operation of hydro-turbines. Due to the particularity of structure, there is always a gap between the runner and the shell of the tubular turbine, and the eccentricity of the runner often occurs due to manufacturing or installation. The uneven clearance caused by runner eccentricity will lead to Alford effect and may induce the self-excited vibration. Based on a model tubular turbine, the Alford effect and Alford force of different runner eccentricity is deeply explored through the combination of experiment and numerical simulation. Based on the investigation under a common high-efficiency condition, it is found that the difference of runner eccentricity will cause obvious changes in performance. With the increase of runner eccentricity, the average value of runner radial force increases gradually. The overall frequency of radial force shows several frequency bands and the frequency may shift with the increase of eccentricity level. The runner eccentricity causes obvious changes of internal flow and tip leakage vortex in the blade tip clearances. In the narrowest clearance due to eccentricity, the turbulence kinetic energy and vortex intensity obviously rise up. The pressure in the clearances with different widths are also different. The influence of flow field inside clearance will be the main reason of Alford effect. This study is meaningful for tubular turbines for the operation stability and security." @default.
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- W4308016770 date "2022-11-01" @default.
- W4308016770 modified "2023-09-30" @default.
- W4308016770 title "Influence of runner eccentricity on the hydraulic performance of tubular turbine: A comparative case study" @default.
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- W4308016770 doi "https://doi.org/10.1177/09576509221137631" @default.
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