Abstract
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.
Highlights
Wind energy is one of the most popular renewable energy sources; over the last decades, wind turbines have been extensively developed [1]
Summing up the results of simulation tests, it can be stated that when constructing a Counter-Rotating Wind Turbine (CRWT) turbine, rotors should be placed at a distance of at least 0.5 D or more
Power coefficient can be potentially increased with a Counter-Rotating Wind Turbine (CRWT)
Summary
Wind energy is one of the most popular renewable energy sources; over the last decades, wind turbines have been extensively developed [1]. Horizontal Axis Wind Turbines (HAWT) are, most often, in operation. This type of a wind turbine is commonly studied. Wind Turbines (VAWT), due to their capability to operate independently from wind direction, have gained some industry interest. Another possible solution is the Magnus effect-based wind turbine, which uses rotating cylinders acting as blades. A Counter-Rotating Wind Turbine is a turbine with two counter-rotating rotors. This type of a wind turbine is not yet operating on a commercial scale and still needs development and studies
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
