Shape optimization of a Savonius wind rotor with different convex and concave sides

Tian, Wenlong; Mao, Zhaoyong; Zhang, Baoshou; Li, Yanjun

doi:10.1016/j.renene.2017.10.067

Cited by 159 publications

(64 citation statements)

References 20 publications

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“…It is a drag type turbine, and compared with other VAWTs, its performance peaks at relatively lower TSRs [10]. This turbine is distinctively attributed with decent self-starting characteristics as a consequence of the large static torque it generates, and this is one of its main traits which attracts researchers [11]. There have been numerous attempts to capitalize on the aforementioned characteristics, and further improve the efficiencies of Savonius VAWTs using experimental and numerical techniques.…”

Section: Of 21mentioning

confidence: 99%

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

2019

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This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (Cp) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed.

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Section: Of 21mentioning

confidence: 99%

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

2019

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“…The Kriging Method proposed by Danie G. Krige in 1951 is a widely used surrogate model to establish the response surface [29,30]. The Kriging method expresses the unknown function as the sum of the linear regression part and the system deviation part:…”

Section: Kriging Methodsmentioning

confidence: 99%

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Song

Mao

et al. 2018

Energies

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Abstract:A rim driven thruster (RDT) is an integrated deep-sea motor thruster that has been widely studied. In order to improve the performance of RDT, a novel RDT motor with a modular stator is proposed in this paper. The electromagnetic performance of the new RDT motor is analyzed by the finite element method (FEM). The influence of structure parameters on the electromagnetic performance of the new RDT motor are analyzed in detail. It is shown that the effect of additional tooth width and pole arc coefficient on the electromagnetic performance of the stator modular RDT motor is significant. To obtain the optimal design with a maximum average electromagnetic torque and minimum torque fluctuation ratio, a multi-objective optimization design method combining the non-dominated sorting genetic algorithm II (NSGA-II), Kriging method and FEM is presented in this paper. A set of Pareto optimal solutions is obtained, and the optimal design point is selected from the Pareto fronts. Compared with the initial design, the average electromagnetic torque of the optimized model is improved by 16.591% and the fluctuation ratio is reduced to 3.18%.

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“…Figure 12 shows the formation of strong tip vortices (red contour) near the advancing blades of turbines below the mainstream. This phenomenon happens when the reverse flow combines with the upstream flow and thus creating high speed and low pressure regions [20]. Table 5 shows the power density compared with the published data of the same configuration.…”

Section: Wind Farm Performancementioning

confidence: 99%

Enhancement of Wind Farm Power Density by an Oblique Linear Configuration

Zakaria¹,

Ibrahim²,

MIDI³

2020

ARFMTS

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An optimum layout of turbines in a wind farm can be measured by a parameter called wind power density. This is essentially the power generated by the turbine per unit area. This paper attempts to demonstrate how the parameter could be increased by an oblique array configuration. In this numerical study, multiple helical Savonius turbines were used to compare the performances of different wind farm layout designs by using a finite element CFD solver. The optimum spacing between turbines was first determined for three turbine array configurations. It was then extended to a nineturbine array in V formation. Three wind farm configurations were considered namely all in clockwise (CW) or counterclockwise direction (CCW) and the other is a combination of CW and CCW direction. The wind power density for each configuration was then compared. The nine turbines arranged in V formation has improved its power density by 4 to 5 times when compared to nine isolated turbines in a wind farm.

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Shape optimization of a Savonius wind rotor with different convex and concave sides

Cited by 159 publications

References 20 publications

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Enhancement of Wind Farm Power Density by an Oblique Linear Configuration

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