Development of a high-performance wind turbine equipped with a brimmed diffuser shroud

Yuji Ohya, Takashi Karasudani, Akira Sakurai, Masahiro Inoue

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We have developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The brimmed-diffuser shroud plays the role of a device for collecting and accelerating the approaching wind. Emphasis is placed on positioning the brim at the exit of the diffuser shroud. Namely, the brim generates a very low-pressure region in the exit neighborhood of the diffuser by strong vortex formation and draws more mass flow to the wind turbine inside the diffuser shroud. To obtain a higher power output of the shrouded wind turbine, we have examined the optimal form for the brimmed diffuser, such as the diffuser open angle, brim height, hub ratio, centerbody length, inlet shroud shape and so on. As a result, a shrouded wind turbine equipped with a brimmed diffuser has been developed, and demonstrated power augmentation for a given turbine diameter and wind speed by a factor of about five compared to a standard (bare) wind turbine.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalTransactions of the Japan Society for Aeronautical and Space Sciences
Issue number163
Publication statusPublished - Dec 28 2006

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


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