Pump to turbine transient for a pump-turbine in a model test circuit and a real size power plant

29th IAHR Symposium on Hydraulic Machinery and Systems

Riedelbauch, S.^1 ; Stens, C.^1

Institute of Fluid Mechanics and Hydraulic Machinery, University of Stuttgart, Pfaffenwaldring 10, Stuttgart

70569, Germany^1

关键词: Hydraulic power plant;    Method of characteristics;    One-dimensional systems;    Open-source code;    Reversible pump-turbine;    Rotational speed;    Steady operating conditions;    Transient calculation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/7/072039/pdf
DOI  :  10.1088/1755-1315/240/7/072039

来源: IOP

【 摘 要 】

Ongoing development in variable speed technology for hydraulic power plants improves the flexibility and allows new manoeuvres. In this context, the present work investigates a fast transition from pump mode to generating mode in a reversible pump-turbine by means of CFD and one-dimensional plant dynamic analysis. Calculations are carried for a transition at model scale and finally for a transition in an existing power plant. At model scale, simulation is compared to data measured in the framework of the HYPERBOLE project. For the simulation of the transition at model scale, experimental data for rotational speed and flow rate are prescribed as boundary conditions. To include interaction with the pipe system, the open-source code OpenFOAM® is subsequently coupled to an in-house code for one-dimensional system analysis based on the Method of Characteristics. The coupled method is validated by a comparison to the reference simulation at model scale, and applied to the existing power plant. Results include the evaluation of pressure values and fluctuations at various locations in the machine and the description of different flow phenomena. Furthermore, results for steady operating conditions are compared to the results from transient calculations to identify dynamic effects.