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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/21866
Title: Proper orthogonal decomposition of turbulent swirling flow of a draft tube at part load
Authors: Kumar, Sandeep
Khullar S.
Cervantes M.J.
Gandhi, Bhupendra K.
Published in: IOP Conference Series: Earth and Environmental Science
30th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2020
Abstract: A large scale vortical structure, i.e., rotating vortex rope (RVR), generally forms at part load (PL) operation of a reaction turbine due to the combined effect of swirling flow at the runner outlet and the adverse pressure gradient in the draft tube. Even with the data analysis through advanced measurement techniques like Laser Doppler velocimetry (LDV) and Particle Image Velocimetry (PIV), the information available about the flow instabilities developed due to RVR is still incomplete. This paper presents an application of the proper orthogonal decomposition (POD) method to analyze the flow field inside the draft tube cone at PL operation of a high-head model Francis turbine. The POD analysis is performed on 250 PIV snapshots containing the axial and radial velocities. The results show that the first eight modes contain more than 95% of the total kinetic energy (KE) of the flow field and are associated with the organized motion of the flow. The first mode contains more than 50% of the total energy, and the axial velocity profile reconstructed with the first mode is identical to the mean axial velocity flow field. The maximum dissipation of the turbulent kinetic energy (TKE) occurs through unorganized motion. © Published under licence by IOP Publishing Ltd.
Citation: IOP Conference Series: Earth and Environmental Science (2021), 774(1)
URI: https://doi.org/10.1088/1755-1315/774/1/012091
http://repository.iitr.ac.in/handle/123456789/21866
Issue Date: 2021
Publisher: IOP Publishing Ltd
Keywords: Doppler effect
Flow fields
Hydraulic machinery
Hydraulic motors
Kinetics
Laser Doppler velocimeters
Swirling flow
Turbulent flow
Velocity measurement
Advanced measurement techniques
Adverse pressure gradient
Laser Doppler Velocimetry
Particle image velocimetries
Proper orthogonal decomposition method
Proper orthogonal decompositions
Turbulent kinetic energy
Turbulent swirling flows
Kinetic energy
ISSN: 17551307
Author Scopus IDs: 57201873447
57216653256
55328928400
7006087147
Author Affiliations: Kumar, S., Indian Institute of Technology, India Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, Roorkee, 247667, India
Khullar, S., Indian Institute of Technology, India Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, Roorkee, 247667, India
Cervantes, M.J., Lulea University of Technology, Sweden Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, Norrbotten, 97187, Sweden
Gandhi, B.K., Indian Institute of Technology, India Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, Roorkee, 247667, India
Appears in Collections:Conference Publications [CS]
Conference Publications [ME]

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