Experimental and numerical studies on the possibility of duct flow low-power generation using a butterfly wind turbine

Yutaka Hara, Shohei Kogo, Katsuhiro Takagaki, Makoto Kawanishi, Takahiro Sumi, Shigeo Yoshida

Research output: Contribution to journalArticle


An objective of this study is to demonstrate the validity of using a small wind turbine to recover the fluid energy flowing out of an exhaust duct for the generation of power. In these experiments, a butterfly wind turbine of a vertical axis type (D = 0.4 m) is used. The output performance is measured at various locations relative to the exit of a small wind tunnel (W = 0.65 m), representing the performance expected in an exhaust duct flow. Two-dimensional numerical analysis qualitatively agrees with the experimental results for the wind turbine power coefficient and rate of energy recovery. When the turbine is far from the duct exit (more than 2.5 D), an energy recovery rate of approximately 1.3% is obtained.

Original languageEnglish
Pages (from-to)19-29
Number of pages11
JournalInternational Journal of Fluid Machinery and Systems
Issue number1
Publication statusPublished - Jan 1 2017


All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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