Study on the performance of helical savonius rotor for wave energy conversion

Zullah, Mohammed Asid; Prasad, Deepak; Choi, Young‐Do; Lee, Young-Ho; Wahid, Mazlan Abdul; Samion, Syahrullail; Sidik, N. A. C.; Sheriff, Jamaluddin Md.

doi:10.1063/1.3464913

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Since the formation of the waves is time dependent and unsteady, a transient simulation was performed using the k-ϵ turbulence model. The use of the same model for wave simulation has been reported in some previous works [15,[17][18][19]. This model is able to capture the turbulence accurately.…”

Section: Methodsmentioning

confidence: 82%

Effect of Oscillating Water Column Chamber Inclination on the Performance of a Savonius Rotor

Prasad

Ahmed

Lee

2020

Journal of Offshore Mechanics and Arctic Engineering

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The power potential in the waves that hit all the coasts worldwide has been estimated to be of the order of 1 TW. Each wave crest transmits 10–50 kW/m of energy, which is 15–20 times higher than wind or solar energies. The availability of wave energy is 90% compared to 30% for wind and solar energies. The oscillating water column (OWC), which is the most investigated wave energy converter consists of a partially submerged hollow structure positioned either vertically or inclined. The bidirectional airflow above the water column drives a turbine. The conventional OWCs experience flow separation at the sharp corners of the chamber. To address this issue, researchers have proposed inclining the chamber at an angle with respect to the incident waves to improve the flow characteristics. In the present work, the effect of OWC inclination on rotor performance is studied using the computational fluid dynamics (CFD) code ansys-cfx. The results highlight that the 55 deg inclined OWC showed improved performance compared to the conventional OWC and modified OWC (optimized in a previous work). The maximum power for the inclined OWC was 13% higher than that for the rotor in the modified OWC and 28% than that in the conventional OWC at mean wave condition. The 55 deg inclined OWC recorded peak rotor power of 23.2 kW with an efficiency of 27.6% at the mean sea state. The peak power and efficiency at maximum sea state were 26.5 kW and 21.5%, respectively.

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Section: Methodsmentioning

confidence: 82%

Effect of Oscillating Water Column Chamber Inclination on the Performance of a Savonius Rotor

Prasad

Ahmed

Lee

2020

Journal of Offshore Mechanics and Arctic Engineering

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“…They found that the maximum power coefficient of 0.426 is obtained at flow velocity of 2 m/s. Further, Zullaha et al (2010) studied on three bladed helical Savonius rotors. Their obtained results indicate that the helical Savonius rotor models are suitable to analyze the water flows in the turbine.…”

Section: --mentioning

confidence: 99%

“…They found that the best performance has been obtained from curtain position of 60°. Zullaha et al (2010) elaborate the current research at studying the performance of submerged Savonius turbine for wave energy extraction from the oscillating water column. The CFD simulations show the potential of the twisted Savonius blades in terms of smooth running, higher efficiency and self-starting capability as compared to that of the conventional Savonius rotor.…”

Section: Review On Cfd Analysismentioning

confidence: 99%

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Debnath

Gandhirajan

2023

Wind Engineering

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The helical Savonius rotor (HSR) is used as green energy generation. The accurate design of HSR is essential before installing any wind farm in a region. It has been widely employed that positive static torque coefficients of helical Savonius rotor are higher compared to conventional semicircular rotor stated by several researchers. The reason is behind that the formation of secondary vortex of fluid. It is leading by vertical vortex flow, which passes over the curve surface and creates drag force. Still now, various design have been proposed to meet peak power output through optimum geometry parameters like blade profile design, aspect ratio and overlap ratio. The selection of blade material is also the influencing parameter to improve the starting torque of the rotor. In this regards present paper is aim to study the details experimental, numerical, and analytical review on HSR and selection of blade material with minimum production cost.

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“…Based on the work of (Salazar Marin and Rodrguez, 2019), the sheet thickness was set at 2mm. Using two-dimensional transient simulations, (Alipour et al, 2020;Tian et al, 2015) examined performance enhancement through a parabolic and Myring Equation-inspired blade design, respectively, while (Zullah et al, 2010;Gruber et al, 2012) evaluated a helical and humpback whale-inspired blade design, respectively, using the ANSYS-CFX code. This study provides a unique optimization approach for optimising DDTT blade design and energy output, presenting preliminary results to help engineers make informed decisions when choosing from an extensive variety of computational techniques.…”

Section: Introductionmentioning

confidence: 99%

Simulation Validation of Moment Balancing Method for Drag-Dominant Tidal Turbines

Zhang,

Mittal,

2024

Springer Proceedings in Energy

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Drag-dominated turbines play a key role in the application of urban windfarm and multi-flow direction tidal arrays because of their low cut-in speed and omnidirectional characteristics. A performance analysis study of Pinwheel and Savonius tidal turbines has been carried out using Computational Fluid Dynamics (CFD) software to define the optimal power coefficient (Cp) and Tip-Speed-Ratios (TSR). The classic Disk Actuator model assumes a fixed virtual disc with or without porous holes perpendicular to the inflow direction. This is unsuitable for drag-dominant turbine because of the rotating virtual disc of the rotor plate of a vertical-axis turbine, the unaccounted bypass flow interaction on the downstream flow boundary for a horizontal-axis turbine, and parasitic force acting on the rotor/support walls for both. Therefore, a more applicable model is required for the tidal turbine realm. The focus of this study is to propose a novel method to find the optimal TSR of a drag-dominant turbine with a cost-effective and user-friendly Moment Balancing algorithm.The CFD models were inspired and scaled from experimental findings in the literature review. Both models were made comparable using a parametric study to equalize the blockage area at 12%. After careful analysis of different solver settings, steady k-epsilon model was selected, and grid independence tests were conducted. V-shaped TSR matrix was developed with varying turbine rotational speeds and fluid inlet velocity, unlike previous works simulated at a fixed velocity. For Pinwheel and Savonius, the TSR range for simulations is 0.64-5.0 and 0.3-1.0 respectively. Thrust Moment (Acting) is calculated when the turbine is stationary, but the fluid motion exerts load and rotates it. Idle Moment (Resisting) is calculated when the turbine is rotating at a given speed and the water is stationary hence, a load is exerted on the turbine. Linear regression analysis was performed and coefficients for thrust and idle moment were calculated, thus, formulating an equation for the net moment of Pinwheel and Savonius. It is found that the power coefficient is maximum or zero when idle and thrust moment offset each other at the neutral point. The optimal TSR are found for Pinwheel at 2.37 and Savonius at 0.63 with 15.6% and 11.1% error rate respectively for experimental validation.Based on the findings, thrust and idle moment have a positive and negative quadratic relationship respectively with the inlet velocity. A hill-shaped curve is observed between power coefficient and TSR. The optimal TSR for Pinwheel is higher than Savonius, thereby a higher rotational and lower inlet speed should be adjusted accordingly and vice versa. The proposed algorithm is expected to improve and simplify an engineer's understanding of the turbine's optimal TSR by adjusting the rotor speed to suit the inlet flow case. The computational cost is greatly reduced through replacing net moment simulations by combining thrust and idle moment simulations. Upon commercial launch of the algorithm, the tidal e...

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Study on the performance of helical savonius rotor for wave energy conversion

Cited by 7 publications

References 10 publications

Effect of Oscillating Water Column Chamber Inclination on the Performance of a Savonius Rotor

Effect of Oscillating Water Column Chamber Inclination on the Performance of a Savonius Rotor

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Simulation Validation of Moment Balancing Method for Drag-Dominant Tidal Turbines

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