Flow in contra-rotating pump-turbines at stationary, transient, and cavitating conditions
Doctoral thesis, 2024

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Contra-rotating

Mode-switching

CFD

Pump-turbine

Cavitation

Pumped hydro storage

Shutdown

Low-head

Startup

OpenFOAM

Author

Jonathan Fahlbeck

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Included papers

Popular science description

English

The need for energy storage is rising due to the growing portion of electrical energy produced by intermittent energy sources, such as wind and solar power. Pumped hydro storage (PHS) is currently the most effective form of energy storage. However, the power and storage capacity of PHS depends on the natural elevation differences between water reservoirs. Consequently, the main development has predominantly focused on applications where a large elevation difference is available. To make PHS available in regions lacking a favourable topography with high mountain regions, innovative pump-turbine technologies are required for lower elevation differences. In an effort to develop suitable pump-turbine technologies for low-land regions, the ALPHEUS EU H2020 research project explored the possibility of using novel axial-flow contra-rotating pump-turbines (CRPT). The CRPT is not used in either PHS or conventional hydropower at present. The CRPT differs from conventional pump-turbine designs as it uses two runners, rotating in opposite directions, instead of a single runner with guide vanes configuration. The two-runner contra-rotating arrangement thus introduces unexplored challenges in terms of operational range and how to execute transient operations such as startup and shutdown. Therefore, to maximise the usability and flexibility of potential future PHS using CPRTs, this thesis investigates the CRPT developed within the ALPHEUS project at stationary, transient, and cavitating flow conditions. The research is conducted using computational fluid dynamics simulations to analyse the complex flow field through the CRPT.

Research Project(s)

Augmenting grid stability through Low-head Pumped Hydro Energy Utilization & Storage (ALPHEUS)

European Commission (EC) (EC/H2020/883553), 2020-04-01 -- 2024-03-31.

Categorizing

Driving Forces

Sustainable development

Subject Categories (SSIF 2011)

Energy Engineering

Water Engineering

Fluid Mechanics and Acoustics

Areas of Advance

Energy

Infrastructure

C3SE (-2020, Chalmers Centre for Computational Science and Engineering)

Identifiers

ISBN

978-91-8103-077-8

Other

Series

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5535

Publisher

Chalmers

Public defence

2024-09-19 10:00 -- 13:00

HA3, Hörsalsvägen 4

Online

Opponent: Univ. Prof. Dr.-Ing. Christian Bauer, TU Wien, Austria

More information

Latest update

2/12/2025