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Numerical Analysis of Water Jet Injection in the Draft Tube of a Francis Turbine at Part Load Operations
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee , Roorkee 247667, India.
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee , Roorkee 247667, India.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee , Roorkee 247667, India.
2022 (English)In: Journal of Fluids Engineering, ISSN 0098-2202, E-ISSN 1528-901X, Vol. 144, no 11, article id 111201Article in journal (Refereed) Published
Abstract [en]

The off-design operation of Francis turbines results in the onset of flow instabilities. These instabilities lead to severe pressure pulsations, power swings, fatigue damage, and torque fluctuations in the turbine unit. Axial water jet injection in the draft tube is a relatively recent method proposed to reduce the detrimental effects of flow instabilities on turbine performance. However, its efficacy at different operating points needs to be ascertained before implementing in actual prototype turbines. This work reports the findings of numerical investigations performed with water injection at three different part-load conditions. These operating points represent distinct flow regimes in the draft tube. The effect of water injection on the velocity and pressure fields in the draft tube is investigated. The results indicate that the water jet strongly influences the turbine performance at part-loads involving a precessing vortex rope. However, little influence of water jet is observed at deep part-load operation. The interaction of the jet with the draft tube bend is also investigated. The results show that the amount of water jet needs to be cautiously controlled as higher water jet injection impacting the bend may deteriorate the performance. The influence of water jet injection on the pressure recovery, power output, and efficiency of the turbine unit is also reported.

Place, publisher, year, edition, pages
ASME Press, 2022. Vol. 144, no 11, article id 111201
National Category
Ocean and River Engineering
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-91925DOI: 10.1115/1.4054564ISI: 000857345700011Scopus ID: 2-s2.0-85131821368OAI: oai:DiVA.org:ltu-91925DiVA, id: diva2:1677128
Note

Validerad;2022;Nivå 2;2022-06-27 (sofila);

Funder: IIT-Roorkee; Central Power Research Institute (CPRI), India (CPR-1133-MID)

Available from: 2022-06-27 Created: 2022-06-27 Last updated: 2022-11-08Bibliographically approved

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Cervantes, Michel

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