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

Pacholczyk, Michał; Karkosiński, Dariusz

doi:10.3390/en13153880

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…(5) Mutual induction factor and induced FS velocity at RR The mutual induction factor from the FR to the RR is calculated by the ADM results and the thrust coefficient of the FR by using the ADM results and the thrust coefficient of the FR as Equation (7). The FS velocity is replaced by the induced FS velocity as Equation ( 11) at the RR.…”

Section: ) Initial Conditionsmentioning

confidence: 99%

“…Pacholczyk et al [7] applied the ALM for the calculation of CCRR performance. No significant interference was found between the two rotors if the clearance between the two rotors is 0.5 time of the rotor diameter (D), which is significantly larger than the CCRR in the present study (0.1 D).…”

Section: Introductionmentioning

confidence: 99%

“…The MP model transfers the interaction between two numerical regions. The application of the present model is limited for a steady symmetric flow [7], which is assumed in the present study. Each of the FRs and RRs is represented by one blade, periodic boundary conditions are applied in the rotation direction, and the interaction between the two rotors is transmitted at the radial position of each blade [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of Individual Rotor Mutual Induction (IRMI) Method for Coaxial Counter-Rotating Rotor

Yoshida,

Fuchiwaki,

Matsuoka

2024

Applied Sciences

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A coaxial counter-rotating rotor (CCRR), which has two rotors rotating in the opposite directions on the same axis, is seen as a promising technology for low-cost floating tidal current/ocean current power generation using single-point mooring, as the torques of the front and rear rotors are cancelled. In the evaluation and design of such turbines, there is a need for an accurate analysis method with a low computational load that considers the strong mutual induction between the two rotors placed close together. An individual rotor mutual induction (IRMI) method was developed in this study, aiming to significantly reduce the calculation time of conventional computational fluid dynamics (CFD), considering the mutual induction that are not considered in conventional modified blade element and momentum methods. In this method, the basic characteristics of the front and rear rotors are calculated in advance using full-model CFD. In calculations for the CCRR, in addition to these individual characteristics of each rotor, the interaction between the rotors is considered using the actuator disk model CFD calculated in advance. The condition where the torques of the front and rear rotors are cancelled is determined at the same time. This method was used to analyze models in which the front and rear rotors were approximately the same diameter and placed close together (10% of the rotor diameter). A comparison with the mixing plane model CFD revealed that they agree quite well when mutual induction is considered, although both the power and thrust are overcalculated when it is ignored. The simulation time of the IRMI would be almost counter-proportional to the numbers of TSR conditions to solve as compared with the CFD with the MP model.

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Section: ) Initial Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Individual Rotor Mutual Induction (IRMI) Method for Coaxial Counter-Rotating Rotor

Yoshida,

Fuchiwaki,

Matsuoka

2024

Applied Sciences

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“…Investigation on DRWT has been carried recently to optimize its performance by several parameters and to reveal the mechanism. Experiments with PIV [1,2] and methods including blade element momentum method [3] vortex methods and CFD [4,5] are applied. BEM method faces the challenge of modelling the nonuniform inflow of rear rotor and rotor-rotor interaction, while vortex methods based on potential theory can consider the interaction of either wake and either rotor with less computational cost than CFD.…”

Section: Introductionmentioning

confidence: 99%

Unsteady aerodynamic modelling for dual-rotor wind turbines with lifting surface method and free wake model

Chen

Yin

et al. 2022

J. Phys.: Conf. Ser.

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A time-marching aerodynamic model for dual-rotor wind turbines (DRWT) is presented with the lifting surface method and free wake model. The performance of a reference DRWT by two axial connected NREL 5MW wind turbines is calculated to verify the algorithm. The output converges with remarkable oscillation. Free wakes swell under the coupling effect. The accumulated power of DRWT outranges single-rotor wind turbine (SRWT) by a limited extent under certain operating conditions. The front rotor (FR) produces the major portion of the power, especially for low inflow velocity. The unsteadiness of performance and spanwise load is further investigated, and the result shows that the power output of the rear rotor (RR) undergoes greater fluctuation than FR. The rotor-rotor induction strengthens both the rotors’ performance before they align and weakens it when they rotate away. The additional disturbance caused by FR’s tip vortices acts negatively on RR’s torque by upwashing the blade tip.

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“…Combining the previous concepts, Pacholczyk et al [43] proposed a small counterrotating wind turbine consisting of two counter-rotating rotors, a 1-DOF planetary gearbox and a counter-rotating generator. The authors investigated its performance and operational point as functions of axial distance and tip speed ratio of each rotor.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

et al. 2021

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Increasing the efficiency of wind power conversion into electricity poses major challenges to researchers and developers of wind turbines, who are striving for new solutions that can ensure better use of local wind potential in terms of both feasibility and affordability. The paper proposes a novel concept of wind systems with counter-rotating wind rotors that can integrate either conventional or counter-rotating electric generators, by means of the same differential planetary speed increaser, aiming at providing a comparative analysis of the energy performance of counter-rotating wind turbines with counter-rotating vs. conventional electric generators. To this end, a generalized analytical model for angular speeds and torques has been developed, which can be customized for both system configurations. Three numerical simulation scenarios have been contrasted: (a) a scenario with identical wind rotors in both systems, (b) a scenario with the secondary wind rotors being identical in the two applications, but different from the primary rotors, and (c) a scenario with different secondary rotors in the two wind turbines. The results have shown that the wind systems with counter-rotating generator are more efficient and have a higher amplification ratio, compared to systems with conventional generators. In addition, the analyzed wind system with a counter-rotating generator displays better energy performance with low values for output power and ratio of input speeds, whereas the wind turbine with a conventional generator proves to be more efficient in the high-value range of the above-mentioned parameters.

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

Cited by 8 publications

References 24 publications

Development of Individual Rotor Mutual Induction (IRMI) Method for Coaxial Counter-Rotating Rotor

Development of Individual Rotor Mutual Induction (IRMI) Method for Coaxial Counter-Rotating Rotor

Unsteady aerodynamic modelling for dual-rotor wind turbines with lifting surface method and free wake model

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

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