Performance analysis of a Savonius hydrokinetic turbine having twisted blades

Kumar, Anuj; Saini, R.P.

doi:10.1016/j.renene.2017.03.006

Cited by 130 publications

(23 citation statements)

References 53 publications

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“…Their results showed good agreement between the simulated and measured values. A more comprehensive wake study for different Reynolds numbers with CFD, and some description of turbulent behavior in the wake, was reported by Kumar and Saini . That work does however focus on the effects of twist angle on the overall performance and not on wake recovery.…”

Section: Introductionmentioning

confidence: 99%

Performance and wake of a Savonius vertical‐axis wind turbine under different incoming conditions

et al. 2019

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In this study, the performance, drag, and horizontal midplane wake characteristics of a vertical‐axis Savonius wind turbine are investigated experimentally. The turbine is drag driven and has a helical configuration, with the top rotated 180° relative to the bottom. Both performance and wake measurements were conducted in four different inflow conditions, using Reynolds numbers of ReD≈1.6×105 and ReD≈2.7×105 and turbulence intensities of 0.6% and 5.7%. The efficiency of the turbine was found to be highly dependent on the Reynolds number of the incoming flow. In the high Reynolds number flow case, the efficiency was shown to be considerably higher, compared with the lower Reynolds number case. Increasing the incoming turbulence intensity was found to mitigate the Reynolds number effects. The drag of the turbine was shown to be independent of the turbine's rotational speed over the range tested, and it was slightly lower when the inflow turbulence was increased. The wake was captured for the described inflow conditions in both optimal and suboptimal operating conditions by varying the rotational speed of the turbine. The wake was found to be asymmetrical and deflected to the side where the blade moves opposite to the wind. The largest region of high turbulent kinetic energy was on the side where the blade is moving in the same direction as the wind. Based on the findings from the wake measurements, some recommendations on where to place supplementary turbines are made.

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Section: Introductionmentioning

confidence: 99%

Performance and wake of a Savonius vertical‐axis wind turbine under different incoming conditions

et al. 2019

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“…We also note that our study has focused on VAWT with straight blades. However, twisted blades may enhance the power output, as already pointed out in detailed 3D numerical simulations of Savonius [35] and Darrieus rotors [36]. In addition, twisted blades substantially reduce the oscillations of torque and power, although the interactions with the vortices at the wake avoid the existence of completely smooth output signals [36].…”

Section: Vawtmentioning

confidence: 81%

Net Power Coefficient of Vertical and Horizontal Wind Turbines with Crossflow Runners

Pujol

Massaguer

Massaguer³

et al. 2018

Energies

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Abstract:The feasibility of using crossflow runners as single rotors in vertical-axis wind turbines (VAWT) or as blades in horizontal-axis wind turbines (HAWT) is numerically studied. A computational fluid dynamics model is validated from data obtained in a wind tunnel. Three crossflow runners with different number of blades are tested. Values of drag, lift and torque coefficients are numerically obtained at different turning velocities. Power coefficients C p for crossflow VAWT and HAWT are calculated for different tip-speed ratios (TSR) and runner spin ratios (α). Since crossflow HAWT consume electrical energy for spinning the runners, the net power coefficient is estimated. Simulations indicate that a crossflow runner as a single rotor in VAWT should have a high solidity and work at low TSR. Crossflow runners working as blades in HAWT may achieve low drag to lift ratios but the C p is penalized by the amount of energy required for spinning the runners. The optimum working condition of crossflow HAWT is located within a narrow band of low TSR and α reaching C p values < 0.2 only.

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“…Various attempts have been made in order to improve the performance of these rotors. Kumar and Saini numerically investigated the performance of the Savonius hydrokinetic turbine by varying the twist angle, and the study revealed that the maximum performance occurred at a twist angle value of 12.5° corresponding to 2.0‐m/s water flow velocity. Kamoji et al carried out an experimental investigation by modifying the various design affecting parameters.…”

Section: Configurations Of Cross‐flow Hydrokinetic Turbinesmentioning

confidence: 99%

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

Saini

2019

Int J Energy Res

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Summary Increased demand of energy leads to exploration of new sources of energy. In the last few years, hydrokinetic energy technology emerged as an important area in the field of renewable energy generation. Various hydrokinetic turbines have been studied and used to harness the hydrokinetic potential. Among all hydrokinetic turbine technology, cross‐flow hydrokinetic turbine is considered as the most suitable approach for the riverine system. There are various configurations of cross‐flow hydrokinetic turbine exist for hydrokinetic energy extraction. A number of numerical and experimental studies were carried out on the performance enhancement and design optimization of different configurations under variable operating conditions. Under the present paper, review of different rotor for the configurations of the cross‐flow hydrokinetic turbines are discussed. The paper will be useful to understand the cross‐flow hydrokinetic technology in order to explore the methods for selection, performance enhancement, and design optimization of cross‐flow hydrokinetic turbines.

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Performance analysis of a Savonius hydrokinetic turbine having twisted blades

Cited by 130 publications

References 53 publications

Performance and wake of a Savonius vertical‐axis wind turbine under different incoming conditions

Performance and wake of a Savonius vertical‐axis wind turbine under different incoming conditions

Net Power Coefficient of Vertical and Horizontal Wind Turbines with Crossflow Runners

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

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