Characterization of the Effects of Ingested Bodies on the Rotor–Stator Interaction of Hydraulic Turbines

Alfredo Guardo, Alfred Fontanals, Mònica Egusquiza, Carme Valero and Eduard Egusquiza
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Alfredo Guardo: Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain
Alfred Fontanals: Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain
Mònica Egusquiza: Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain
Carme Valero: Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain
Eduard Egusquiza: Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain

Energies, 2021, vol. 14, issue 20, 1-16

Abstract: Runner and distributor blockages in hydraulic turbines occur due to the ingestion of external bodies such as rocks or logs. These obstructions can change the amplitude and uniformity of the pressure pulsations in the machine, creating large unbalanced forces that can lead to reduced efficiency, increased vibration and mechanical damage. In this paper, the effects of obstructions caused by ingested bodies in the runner and the distributor of a pump turbine on its internal pressure pulsation were investigated by means of computational fluid dynamics. A numerical model of an unobstructed pump turbine is presented and validated against experimental data. Several cases of runner or distributor blockage were studied, and their RSI pressure pulsations were recorded and analyzed at different locations. The results obtained allow us to characterize the effect of these blockages on the machine’s RSI, which can be helpful for the correct diagnosis of these types of damage.

Keywords: turbine failure; ingested bodies; runner blockage; rotor–stator interaction; vibration; computational fluid dynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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