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Performance investigation of a small Savonius‐Darrius counter‐rotating vertical‐axis wind turbine
Author(s) -
Didane Djamal Hissein,
Maksud Siti Masyafikah,
Zulkafli Mohd Fadhli,
Rosly Nurhayati,
Shamsudin Syariful Syafiq,
Khalid Amir
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4874
Subject(s) - rotor (electric) , wind speed , tip speed ratio , vertical axis wind turbine , turbine , torque , wind power , marine engineering , rotational speed , engineering , automotive engineering , control theory (sociology) , mechanical engineering , physics , electrical engineering , meteorology , computer science , control (management) , artificial intelligence , thermodynamics
Summary This paper describes the study of a small vertical‐axis wind turbine (VAWT) with a combined design of Darrius and Savonius counter‐rotating rotors. The main purpose of this study is to improve the extraction capabilities of a single‐rotor VAWT by using two distinct rotor designs while adopting the counter‐rotating technique. Given that the conversion capabilities and operational speed of the existing wind turbines are still limited, the current technique is used to enhance the efficiency and expand the operating wind speed range of the VAWT. The Darrius and Savonius counter‐rotating rotors were exposed to a similar upstream wind speed using a centrifugal blower. It was found that the Savonius‐Darrius counter‐rotating rotor was able to operate effectively, particularly at the low‐speed wind. By looking at the individual performance of the rotors, it was observed that the conversion efficiency of the H‐type rotor increases as the wind speed increases. However, in the case of the S‐type rotor, it is higher at lower wind speed and tends to decrease as the operating speed increases. Thus, the maximum efficiency of the S‐type rotor was achieved at low speed, whereas the H‐type rotor has achieved its maximum efficiency at the highest operating wind speed. The average efficiency of the present Savonius‐Darrius counter‐rotating rotor has been improved to reach almost 42% and 30% more efficiency in terms of torque and power, respectively.