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Mitigation of Draft Tube Pressure Pulsations by Radial Protrusion of Solid Bodies into the Flow Field: An Experimental Investigation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0009-0004-2676-3839
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-3349-601x
Hydraulic Machinery Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran .
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2021 (English)In: IOP Conference Series: Earth and Environmental Science,: 30th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2020), Institute of Physics (IOP), 2021, Vol. 774, article id 012004Conference paper, Published paper (Refereed)
Abstract [en]

An experimental investigation of frequential protrusion of four solid rods into the draft tube of a propeller turbine operating under partial discharge has been undertaken. The effectiveness of mitigating the pressure fluctuations associated with the rotating vortex rope (RVR) has been quantified using pressure measurements on the wall of the draft tube cone. Three azimuthal configurations of the phase difference between the rods, and four protrusion lengths were investigated. It is shown that the rotating component of the RVR decreases, irrespective of the azimuthal configuration and protrusion length, with imposed phase differences in the same direction as the runner rotation being the most effective, reducing the amplitude of the rotating component by a maximum of 62%. However, for each azimuthal configuration, the plunging mode of the RVR is amplified for large protrusion lengths, with the smallest amplification occurring for the case of 180 degrees phase difference between protrusions. Therefore, to quantify the most efficient configuration in mitigating the harmful effects of the RVR, an overall assessment of its effects on the entire turbine must be made before a conclusion can be drawn.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2021. Vol. 774, article id 012004
Series
IOP Conference Series-Earth and Environmental Science, ISSN 1755-1307, E-ISSN 1755-1315
Keywords [en]
hydraulic turbines, part load, rotating vortex rope, pressure pulsations, RVR mitigation, solid-body protrusion
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-87992DOI: 10.1088/1755-1315/774/1/012004ISI: 000712043400004Scopus ID: 2-s2.0-85108613058OAI: oai:DiVA.org:ltu-87992DiVA, id: diva2:1613650
Conference
30th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2020) 21-26 March 2021, Lausanne, Switzerland
Funder
EU, Horizon 2020, 814958Available from: 2021-11-23 Created: 2021-11-23 Last updated: 2024-03-27Bibliographically approved

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Shiraghaee, ShahabSundström, JoelCervantes, Michel

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