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Modeling of flow-induced stress on helical Savonius hydrokinetic turbine with the effect of augmentation technique at different operating conditions

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  • Kumar, Dinesh
  • Sarkar, Shibayan

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.

Suggested Citation

  • Kumar, Dinesh & Sarkar, Shibayan, 2017. "Modeling of flow-induced stress on helical Savonius hydrokinetic turbine with the effect of augmentation technique at different operating conditions," Renewable Energy, Elsevier, vol. 111(C), pages 740-748.
    • Handle: RePEc:eee:renene:v:111:y:2017:i:c:p:740-748
    DOI: 10.1016/j.renene.2017.05.006
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    Cited by:

    1. Nag, Aditya Kumar & Sarkar, Shibayan, 2021. "Techno-economic analysis of a micro-hydropower plant consists of hydrokinetic turbines arranged in different array formations for rural power supply," Renewable Energy, Elsevier, vol. 179(C), pages 475-487.
    2. Kang, Can & Wang, Zhiyuan & Kim, Hyoung-Bum & Shao, Chunbing, 2023. "Effects of solidity on startup performance and flow characteristics of a vertical-axis hydrokinetic rotor with three helical blades," Renewable Energy, Elsevier, vol. 218(C).
    3. Kamal, Md. Mustafa & Saini, R.P., 2022. "A numerical investigation on the influence of savonius blade helicity on the performance characteristics of hybrid cross-flow hydrokinetic turbine," Renewable Energy, Elsevier, vol. 190(C), pages 788-804.
    4. Guo, Fen & Song, Baowei & Mao, Zhaoyong & Tian, Wenlong, 2020. "Experimental and numerical validation of the influence on Savonius turbine caused by rear deflector," Energy, Elsevier, vol. 196(C).

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