Studies on the performance of Savonius rotors in a numerical wave tank

Prasad, Deepak; Ahmed, M. Rafiuddin; Lee, Young‐Ho

doi:10.1016/j.oceaneng.2018.03.084

Cited by 17 publications

(5 citation statements)

References 11 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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“…In contrast, there is a noticeable scarcity of research focused on the geometric parameters of SHT-WECs. Prasad [29] conducted an investigation into the impact of blade entry angles within a numerical wave tank, revealing that the turbine exhibited optimal performance with a blade entry angle of 20°. The blade curvature was optimized to 70° by Ahmed [30] through experimental tests using particle image velocimetry (PIV).…”

Section: Nomenclaturementioning

confidence: 99%

“…The entire domain consists of three distinct subdomains: (i) the rotating domain, facilitating the turbine's rotation through the overset method; (ii) the stationary domain; and (iii) the wave damping domain introduced to prevent undesired wave reflection. The turbine is placed at the center in the horizontal direction, 5 from the inlet and outlets of the domain, which is sufficient to avoid the influence of reflected waves and wave damping on the wave profile close to the turbine [29]. The water depth was set to  , thus, meet the requirement of deep-water waves.…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

Investigations on the wave performance of Savonius turbine operating under initial phase-locked strategy

Li,

Yao,

Eskilsson

et al. 2023

Physics of Fluids

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Savonius hydrokinetic turbines (SHTs), categorized as emerging cyclic-type wave energy converters (WECs), have demonstrated notable potential in achieving elevated energy conversion efficiency and consistent power output. This performance is particularly observed when operating under the initial phase-locked strategy (IPLS), marking a significant advancement in the realm of wave energy harvesting. However, a thorough exploration of the influences stemming from wave conditions and turbine design remains an area that warrants further investigation for advancing the performance of SHT-WECs under the proper operational strategy. This study undertakes an exhaustive analysis of geometric parameters, encompassing turbine diameter, blade number, and thickness. An experiment-validated numerical model based on the unsteady two-phase Reynolds-averaged Navier–Stokes equations is adopted in the research. Comprehensive investigations include analyses of flow fields around the turbine, pressure distributions on blade surfaces, and dynamic torque variations. These analyses serve to elucidate the variation rules of hydrodynamic characteristics and their influential mechanisms. The results highlight the notable impact of the proposed “relative-short wavelength impact” on the performance of SHT-WECs operating under IPLS conditions. Notably, no significant impact is observed when the relative wavelength exceeds 17. Optimal performance is achieved with the thinnest and two-bladed turbine configuration. Moreover, optimizing the turbine diameter significantly enhances SHT-WEC conversion efficiency, with the attained maximum value reaching approximately 18.6%. This study offers a concise guideline for designing turbine diameters in alignment with specific wave conditions.

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“…If the depth of seawater is h, the total microelement segment is m = h/dy. For any pipe element i in the suspension section, the parameters can be calculated by Equation (7), and the parameters at point i + 1 can be calculated by the parameters at point i of the pipeline.…”

Section: Research On Mechanical Model Of Flexible Pipementioning

confidence: 99%

“…Traditional tank model tests can test and study ship displacement, acceleration, the amplitude response operator (RAO), additional mass, and other data. The tremendous increase in modern computer computing power has enabled researchers in the field of wave energy to simulate various sea conditions and study the operation of laying vessels [7][8][9]. However, a small error will cause considerable errors in model building, instrument measurement, and environmental load simulation.…”

Section: Introductionmentioning

confidence: 99%

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

et al. 2021

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In order to adapt to the complex and changeable marine environment such as wind, wave, and current, the physical simulation experiment is usually needed in the design of a deep-sea flexible pipeline-laying system. In reality, the flexible pipeline-laying system is very large, and the experimental cost is huge. Therefore, when analyzing this system, it is necessary to carry out scaled model experiments to verify the rationality of it. Taking the flexible pipeline-laying system working under four-level sea conditions as an example, this paper deduces the similarity criteria of the scaled model according to the similarity theory. According to the required experimental site, the sizes and materials of the model are selected, and then the physical quantities of the model and their similarity ratio corresponding to the prototype are determined. According to the physical quantities of the experimental model, the similarity of dynamic characteristics and structural strength between the model and the prototype are verified by Adams and ANSYS Workbench. The research shows that the scaled model and prototype based on similarity theory can meet the established similarity relationship, and the scaled model experiment is an effective way to verify the rationality of the design of a flexible pipeline-laying system.

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Studies on the performance of Savonius rotors in a numerical wave tank

Cited by 17 publications

References 11 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

Investigations on the wave performance of Savonius turbine operating under initial phase-locked strategy

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

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