Experimental and Numerical Study of Installed Circular and I-65° Type Cylinders Toward Returning-Blade Savonius Turbine for Augmented Aerodynamic Performance

Gunawan Sakti, Triyogi Yuwono*, Wawan Aries Widodo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this essential investigation, the center point returning turbine blade of a Savonius has been positioned in a staggered alignment with a cylinder type I-65°. The conventional circular cylinder has been cut at an angle of 65° on both sides. This kind of cylinder, known as a cylinder, I-65° type, is made to reduce the aerodynamic drag force on the returning blade. The investigation has been performed under two scenarios, conventional and tandem turbine with installing a Cylinder I-65°. The staggered angle has been set within-20°≤α≤90° relative to the center point of the returning turbine blade. Experimental and numerical approaches based on those scenarios have examined the wind turbine performance. Based on a wind speed (U) of 5 m/s, the study has used a width L=2D-b, where D refers to the turbine blade outside diameter, and b is the turbine e-gap. The 0.5D-diameter cylinder I-65° type is positioned 1.4D upstream of the returning turbine blade. In the CFD study, a 2D numerical computation has been iterated by using ANSYS Fluent® 19.1 in order to investigate the Savonius turbine flow. The experiment results indicate that positioning Cylinder I-65° upstream of the returning blade can raise the Savonius turbine power. Furthermore, adding a Cylinder I-65° has enhanced the maximum Cp of the Savonius turbines by about 12%. The peak CP is obtained at a tips-speed ratio λ=0.8 and staggered angle α=0°. Numerical analysis has been carried out to analyze the airflow phenomenon around the turbine more deeply, and the results have showed good agreement to reveal and strengthen experimental quantitative data.

Original languageEnglish
Pages (from-to)120-131
Number of pages12
JournalInternational Review of Mechanical Engineering
Volume17
Issue number3
DOIs
Publication statusPublished - 2023

Keywords

  • Coefficient of Moment
  • Coefficient of Power
  • Cylinder I-65° Type
  • Returning Blade
  • Savonius Turbine

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