Prediction of the characteristic pressure pulsations in a reversible pump-turbine
Date
2023-11-06
Journal Title
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Universidad Tecnológica Nacional. Faculatd Regional Mendoza
Abstract
Reversible Pump- Turbine turbomachines are frequently used in peaking load
hydroelectrical power plants. These plants contribute to satisfy the energy demand during peak
load periods. Its dynamic behaviour is influenced by the flow structures developed along the
distributor and runner vanes. This behaviour depends both on the internal design of the machine
and its operating conditions, whether it works as pump or as a turbine. High-amplitude pressure
pulsations appear due to the rotor-stator interaction phenomenon, and under certain operating
conditions, the frequency of these pulses can seriously affect the structural integrity of the
machine. The goal of this study is to assess the dynamic behaviour of a low-specific-speed
reversible pump-turbine when working both as a turbine or as a pump. For validation, the obtained
numerical results for the pressure pulsation in both operating modes are compared to experimental
results measured on a working prototype. These results could be useful to enhance the knowledge
concerning the behaviour of the pressure pulsations due to the internal flow dynamics into the
machine.
Description
Keywords
Rotor-stator interaction, Turbulence, Pressure pulsation, Computational Fluid Dynamics, Reversible pump-turbine
Citation
Asociación Mecánica Computaciona
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