A Novel Dual-Rotor Turbine for Increased Wind Energy Capture

Rosenberg, Aaron; Selvaraj, Suganthi; Sharma, Anupam

doi:10.1088/1742-6596/524/1/012078

Cited by 66 publications

(118 citation statements)

References 18 publications

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“…A numerical study is conducted using large eddy simulations to investigate the dual rotor wind turbine (DRWT) design proposed by Rosenberg et al 1 The focus of the present study is to examine the aerodynamic performance and aerodynamic loads of a DRWT operating in (a) neutral and (b) stable atmospheric boundary layer conditions. The following conclusions are drawn from the results of this study.…”

Section: Discussionmentioning

confidence: 99%

“…RANS calculations by Rosenberg et al 1 show an increase in power coefficient of 7% with the addition of the second rotor. Here we have corroborated these results using LES for the three different atmospheric conditions identified in Section III.…”

Section: -7% Through Root Loss Mitigation Was Already Demonstrated Fmentioning

confidence: 95%

“…LES simulations are carried out using the optimum DRWT identified in Rosenberg et al 1 The nondimensional chord and twist distributions of the main rotor and the secondary rotor of the DRWT are shown in Fig. 5.…”

Section: Computational Setupmentioning

confidence: 99%

“…It utilizes a secondary, smaller, co-axial rotor to mitigate root losses and to enhance mixing of the turbine wake. Rosenberg et al 1 and Selvaraj 5 introduced this turbine technology and presented preliminary aerodynamic analyses of a DRWT design. The conceptual 5 MW offshore turbine by NREL 6 was used as the baseline single-rotor design and also as the main rotor for the DRWT.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2 shows selected RANS optimization results from Ref. 1. Preliminary investigations of turbine wake evolution were also conducted by performing LES simulations for isolated turbines in uniform flow with no atmospheric (inflow) turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine

Rosenberg

Moghadassian

Sharma

et al. 2015

33rd Wind Energy Symposium

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The objective of this paper is to numerically investigate the effect of the atmospheric boundary layer on the aerodynamic performance and loads of the novel dual-rotor wind turbine (DRWT) proposed by Rosenberg et al.1 Assuming that the turbine operates in isolation, numerical analyses are carried out for two atmospheric stability conditions: (1) neutral, and (2) stable. Comparisons are drawn with the corresponding analyses of a comparable conventional single-rotor wind turbine (SRWT) to assess changes in: (a) aerodynamic efficiency, and (b) dynamic loads on the turbines. The results show that the DRWT improves isolated turbine performance even when atmospheric boundary layer effects are considered. It is also found that the DRWT enhances wake mixing when background turbulence due to the atmospheric boundary layer is moderately high. This has implications on wind plant performance when multiple turbines are placed one behind the other.No significant increase in aerodynamic loads is observed in the DRWT design. In fact, the out-of-plane blade root moment of the main rotor is reduced in the DRWT. Spectral analyses show peaks in unsteady loads at the rotor blade passing frequency and its harmonics for both the primary and secondary rotors. Loads at other (combination) frequencies are observed in the secondary rotor.

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Section: Discussionmentioning

confidence: 99%

Section: -7% Through Root Loss Mitigation Was Already Demonstrated Fmentioning

confidence: 95%

Section: Computational Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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