Multi-rotor systems using ducted wind turbines for power output increase (Multi lens turbine)

K. Watanabe, Y. Ohya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


A multi-rotor system (MRS) is defined as containing more than one rotor in a single structure. The shrouded wind turbine with a brimmed diffuser (B-DAWT) has demonstrated power augmentation for a given turbine diameter and wind speed by a factor of about 2-5 compared with a bare wind turbine. In the present research, B-DAWTs are used in a multi-rotor system. The power output performance of MRSs using two, three and five B-DAWTs in a variety configurations have been investigated, focusing on the aerodynamics of a MRS with multiple B-DAWTs, spaced in close vicinity in the same vertical plane. Power output increases of up to 8, 12 and 21% in average for a two, three and five-rotor MRS configuration are achieved in comparison to those for the stand-alone configuration. Thus, when B-DAWTs are employed as the unit of a MRS, the total power output is remarkably increased. As the number of units for a MRS is increased from two to five, the increase in power output become larger and larger. This is because that the gap flows between B-DAWTs in a MRS are accelerated and cause lowered pressure regions due to vortex interaction behind the brimmed diffusers. Thus, a MRS with more B-DAWTs can draw more wind into turbines showing higher power output.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
Publication statusPublished - Jan 1 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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