CFD Study of the effects of ingested bodies on the RSI of hydraulic turbines

29th IAHR Symposium on Hydraulic Machinery and Systems

Guardo, A.^1 ; Fontanals, A.^1 ; Valero, C.^1 ; Egusquiza, E.^1

Centre de Diagnostic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya Barcelona TECH (UPC-CDIF), Av. Diagonal, 647, Barcelona

08028, Spain^1

关键词: Mechanical damages;    Normal operations;    Pressure pulsation;    Pump-turbines;    Reduced scale models;    Rotor-stator interactions;    Unbalanced force;    Vibration level;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/2/022063/pdf
DOI  :  10.1088/1755-1315/240/2/022063

来源: IOP

【 摘 要 】

The ingestion of large bodies in hydraulic turbines can produce blockage in the runner and/or the distributor, modifying the amplitude and uniformity of pressure pulsations and generating large unbalanced forces. These unwanted effects can lead to reduced efficiency and increased vibration levels, which can produce significant mechanical damage. In this work, we present a characterization of the effects of flow blockages due to ingested bodies on the rotor-stator interaction (RSI) of hydraulic turbines by means of computational fluid dynamics (CFD). For this, a reduced-scale model of a pump turbine was implemented using Ansys® CFX v16.2, and numerical simulations were run for normal operation and blockage operation. Studied blockages included rotor and distributor blockages. Pressure pulsations in rotor and distributor were recorded in order to characterize the effect of the blockage on the RSI of the machine.