Observation and discussion of leading edge vortex shedding from laboratory-scaled cross-flow hydrokinetic turbines in counter-rotating configurations

Minh Doan, Yuriko Kai, Takuya Kawata, Ivan Alayeto, Shinnosuke Obi

研究成果: Conference contribution

抄録

In 2011, John Dabiri proposed the use of counter-rotating vertical-axis wind turbines to achieve enhanced power output per unit area of a wind farm. Since then, various studies in the wind energy and marine hydrokinetic (MHK) literature have been dedicated to pairs of vertical axis turbines in both co-rotating and counter-rotating configurations, in terms of their power production, wake characterization, and optimal array design. Previous experimental works suggest an enhancement of up to 27.9% in the system power coefficient of pair configurations compared to a single turbine. Additionally, previous numerical studies have indicated that the increased power output is correlated with higher torque on the turbine blades which correspondingly produces a stronger leading edge vortex. This paper presents an extended investigation into a pair of laboratory scaled cross-flow hydrokinetic turbines in counter-rotating configurations. Experiments were conducted to observe, compare, and discuss the leading edge vortex shedding from the turbine blades during their positive torque phase. The turbines operated in a small water flume at the diameter-based Reynolds number of 22,000 with a 0.316 m/s freestream velocity and 4% turbulent intensity. Using a monoscopic particle image velocimetry setup, multiple realizations of the water flow around each blade at their positive torque phase were recorded and phase-averaged. Results show consistent leading vortex shedding at these turbine angles while a correlation between the turbine power performance and the vortex size and strength was observed.

本文言語English
ホスト出版物のタイトルFluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791885307
DOI
出版ステータスPublished - 2021
イベントASME 2021 Fluids Engineering Division Summer Meeting, FEDSM 2021 - Virtual, Online
継続期間: 2021 8 102021 8 12

出版物シリーズ

名前American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
3
ISSN(印刷版)0888-8116

Conference

ConferenceASME 2021 Fluids Engineering Division Summer Meeting, FEDSM 2021
CityVirtual, Online
Period21/8/1021/8/12

ASJC Scopus subject areas

  • 機械工学

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