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Title: Modeling of flow-induced stress on helical Savonius hydrokinetic turbine with the effect of augmentation technique at different operating conditions
Authors: Kumar D.
Sarkar S.
Published in: Renewable Energy
Abstract: Conventional Savonius rotor experiences negative and high static torque coefficient at several rotor angles. To prevail over this issue Helical Savonius hydrokinetic turbine (HSHKT) twisted with 90° is proposed, which is able to avoid excessive shaking due to hydrodynamic forces on blades. Usually, HSHKT have a low efficiency, Therefore to enhance the performance coefficient of the rotor some augmentation techniques are required to be used. In this study modeling of flow-induced stresses on HSHKT are performed through fluid-structure interaction analysis. The maximum hydraulic load and von-Mises stress on rotor are found as 0.79 Mpa and 145.45 Mpa respectively in case of duct with single deflector augmentation techniques. Computation results show that edge of shaft and joint of end plate and shaft rotor experiences zone of high von-Mises stress which leads to fatigue crack in this area. In consequence to that augmentation techniques creates adverse effect on stability, smooth operation and service life of rotor at the higher free stream velocity, which opposes the fact that the rotor performance is enhanced by employing augmentation techniques in certain conditions. In this study, it is found that the possibility of fatigue crack increases at higher free stream velocity while using augmentation techniques. © 2017 Elsevier Ltd
Citation: Renewable Energy (2017), 111(): 740-748
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Augmentation techniques
Fatigue crack
Fluid-structure interaction
Helical Savonius hydrokinetic turbine
Hydraulic load
Induced stress
ISSN: 9601481
Author Scopus IDs: 57202478211
Author Affiliations: Kumar, D., Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand 826004, India
Sarkar, S., Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand 826004, India
Corresponding Author: Kumar,
Appears in Collections:Journal Publications [ME]

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