Hydrodyna phase 2

To develop a methodology for engineering safe pump-turbines meeting the challenging requirements of the hydropower market. Discovery experiments will be conducted with the hydrodyna pump-turbine model, and a computing methodology will be developed and validated with experiments.

Improving the availability and reliability of pump-turbines is a challenge from a scientific and technical point of view and includes development of knowledge in advanced fluid and mechanical instrumentation, computation and fluid mechanics. The HYDRODYNA Phase II Research Project intends to capitalise on and extend the effort undertaken under the previous HYDRODYNA Research Project. The 2 main objectives of the HYDRODYNA Project, i.e. investigating rotor/stator interactions and fluid/structure coupling in pump-turbines, retains its focus on the condition assessment of the pump-turbine when subjected to off-design operation and frequent starts and stops. The pump-turbine structure is usually designed to keep stress below the threshold of fatigue limit, and infinite lifetime concept, for a pump-turbine lifespan of several decades. Therefore the structure design is carried out with respect to the expected number of start and stop daily cycles and transient loads, which define a given fatigue limit. However, the intended pump-turbine design lifetime can be dramatically reduced for the following reasons: - a change in the pumped storage plant operation strategy by increasing the number of start and stop cycles and the transient loads; - a long time of operation at off design generating conditions at very low loads as may be required by the grid authority; - a long time of full load operation in generating mode for which both the impeller blades and guide vanes experience intense rotor-stator interactions; - an unexpected event such as load rejection and safety system failure making the pump-turbine experience runaway speed and operate in turbine brake mode where the performance curve may be of S-shape. Therefore, the research project aims to develop a methodology for computing the load cycles experienced by the pump-turbine when subjected to the above-mentioned operating conditions. Moreover, fundamental phenomena like wake transport and dissipation, detachments with adverse pressure gradient, structure vibration effects on fluid boundary layers, composed vortex structure stability and cavitation will be investigated through either basic discovery or rotating machine experiments. Theoretical analyses and model developments will help to understand these complex phenomena and to improve either the flow or the numerical structure simulations. To improve the knowledge of rotor/stator interaction, the experimental data obtained within the previous HYDRODYNA Project will be further analysed with data processing methodology suited to the case of rotating machines.
Project ID: 
4 150
Start date: 
Project Duration: 
Project costs: 
2 010 000.00€
Technological Area: 
Turbines, fluid machinery, reciprocating engines, combined heat and power
Market Area: 
Power transmission equipment (including generators and motors)

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