Numerical investigation on the performance of a small counter-rotating wind turbine

Pacholczyk, Michał; Blecharz, Krzysztof; Karkosiński, Dariusz

doi:10.1051/e3sconf/201911600055

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…Cluster where simulation have been carried out is based on Intel ® Xeon ® Processor E5 v3 @ 2, 3 GHz. In the previous papers [32,33], authors presented partial simulations results obtained with proposed approach while in the present one full parametric study results are described.…”

Section: Crwt Parametric Studymentioning

confidence: 99%

Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

Pacholczyk

Karkosiński

2020

Energies

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A small Counter-Rotating Wind Turbine (CRWT) has been proposed and its performance has been investigated numerically. Results of a parametric study have been presented in this paper. As parameters, the axial distance between rotors and a tip speed ratio of each rotor have been selected. Performance parameters have been compared with reference to a Single Rotor Wind Turbine (SRWT). Simulations were carried out with Computational Fluids Dynamics (CFD) solver and a Large Eddy Scale approach to model turbulences. An Actuator Line Model has been chosen to represent rotors in the computational domain. Summing up the results of simulation tests, it can be stated that when constructing a CRWT turbine, rotors should be placed at a distance of at least 0.5 D (where D is rotor outer diameter) or more. One can then expect a noticeable power increase compared to a single rotor turbine. Placing the second rotor closer than 0.5 D guarantees a significant increase in power, but in such configurations, dynamic interactions between the rotors are visible, resulting in fluctuations in torque and power. Dynamic interactions between rotor blades above 0.5 D are invisible.

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Section: Crwt Parametric Studymentioning

confidence: 99%

Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

Pacholczyk

Karkosiński

2020

Energies

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“…Pacholczyk et al (2017) demonstrated by simulation that a counterrotating 5 MW wind turbine brings approximately 20% of additional power compared to the conventional type. Other results refer to the performance of counter-rotating WECS at different aerodynamic loads and blade pitch angles (Jung et al, 2005;No et al, 2009;Rosenberg et al, 2014;Blecharz and Pacholczyk, 2018;Wang et al, 2022), for different number of blades (Pamuji and Bramantya, 2019), various rotor axial distances (Irawan and Bramantya, 2016;Koehuan and SugiyonoKamal, 2017;Pacholczyk et al, 2019), or different rotor configurations (Radhakrishnan et al, 2022). Thus, Rosenberg et al (2014) demonstrated that the power coefficient for counter-rotating rotors is influenced by the distance between the rotors and their diameters, increasing by 8%-9% when the distance equals the rotor radius and by 7% when the diameter of the upwind rotor is a quarter of the downwind rotor diameter.…”

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Comparative analysis of torque-adding wind energy conversion systems with a counter-rotating vs. conventional electric generator

et al. 2023

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The paper presents a comparative analysis on the steady-state behavior of two counter-rotating wind turbines with same components, where the generator can operate as a counter-rotating (with both a mobile rotor and stator—Case a) vs. conventional (with a fixed stator—Case b) electric machine. These wind energy conversion systems (WECSs) also have two coaxial counter-rotating wind rotors and a one-degree-of-freedom (1-DOF) planetary speed increaser with two inputs and one or two outputs for compatibility with the considered generator. The paper aims at highlighting the efficiency and energy performances of WECSs with a counter-rotating vs. conventional generator by investigating three functional scenarios (A, B, and C) of the two WECS cases (a and b) under the assumption of identical or different counter-rotating wind rotors. A generalized kinetostatic modeling algorithm is first proposed, starting from the general case of WECS with a counter-rotating generator, which allows the establishment of analytical relationships corresponding to speeds and torques at input and output shafts. Numerical simulations of the obtained closed-form model in each scenario highlighted the influence of the constructive parameters on WECS performances, as well as the energetic superiority of WECS, with a counter-rotating generator (Case a) vs. conventional generator (Case b): higher efficiency by 1.2% and more output power by 1% (Scenario A) to 5.5% (Scenario C).

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Numerical investigation on the performance of a small counter-rotating wind turbine

Cited by 2 publications

References 22 publications

Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

Comparative analysis of torque-adding wind energy conversion systems with a counter-rotating vs. conventional electric generator

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