Effect of bearing dissipative torques on the dynamic behavior of H-Darrieus wind turbines

Pinheiro, Kelvin Alves; Filho, Sérgio de Souza Custódio; Vaz, Jerson Rogério Pinheiro; Mesquita, Alexandre Luiz Amarante

doi:10.1007/s40430-021-03122-1

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…where ν 0 is the cinematic viscosity, whose value is 315.6 cSt; n is the numerical solution of (3) in revolutions per minute and f 0 for deep-groove ball bearings and is equal to 2 when lubricated in an oil bath. References [6,11] give different values for f 0 associated with bearing types and lubrication methods.…”

Section: The Dissipative Torquementioning

confidence: 99%

“…In addition to supplying electricity to extensive metropolitan areas, wind power facilities may also attend small settlements with energy [4,5]. This fact encourages the academic community's interest in studying small horizontal and vertical wind power turbines to provide electricity for low-energy-demand populations [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Pinheiro et al [6] investigate the effect of dissipative torque generated by vertical-axis turbine ball bearings applying Newton's second law coupled with the double-multiple current tube method. Palmgren and SKF to determine the dissipative torque and the fourth-order Runge-Kutta to numerically evaluate the turbine's dynamic equation are also implemented.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Steady Analysis of a Small Wind Rotor with Swept Blades

et al. 2023

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It is well known that wind power generation addresses the energy needs of small and remote populations as one of the alternatives to petroleum-based energy’s greenhouse effect. Although there are several publications on rotor design and performance analysis, more should be written about the starting of wind turbines, mainly the small ones, where starting can be a big issue. The present paper evaluates the impact of the swept blade angle on the aerodynamic torque, thrust force, and minimal wind speed required to start the operation of a compact horizontal-axis wind turbine. It presents a novel investigation of the influence of swept rotor blades on the starting performance of a turbine drivetrain. The methodology uses the blade element moment theory coupled to Newton’s second law, in which Palmgren’s extended approach is employed. When the proposed methodology is compared to the experimental data available in the literature, it exhibits good agreement. However, when the wind turbine starts to run, the results show that swept blades do not always enhance the torque coefficient or reduce the thrust force as indicated in some scientific papers. For backward-swept blades, the maximum value decreases 4.0%. Similar behavior is found in thrust force for forward-swept blades. Therefore, more study is required to evaluate many blade foils in several operational environments to confirm this statement.

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Section: The Dissipative Torquementioning

confidence: 99%