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a shrouded wind turbine generating high output power with wind-lens technology与wind-lens笼罩风力涡轮机发电输出功率高技术
Energies 2010, 3, 634–649; doi:10.3390/en3040634
OPEN ACCESS
energies
ISSN 1996-1073
/journal/energies
Article
A Shrouded Wind Turbine Generating High Output Power with
Wind-lens Technology
Yuji Ohya * and Takashi Karasudani
Research Institute for Applied Mechanics, Kyushu University/ Kasuga 816-8580, Japan;
E-Mail: karasu@riam.kyushu-u.ac.jp
* Author to whom correspondence should be addressed; E-Mail: ohya@riam.kyushu-u.ac.jp;
Tel.: +81-92-583-7777; Fax: +81-92-583-7779.
Received: 20 January 2010; in revised form: 6 February 2010 / Accepted: 27 February 2010 /
Published: 31 March 2010
Abstract: 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 shrouded wind
turbine with a brimmed diffuser has demonstrated power augmentation by a factor of
about 2–5 compared with a bare wind turbine, for a given turbine diameter and wind speed.
This is because a low-pressure region, due to a strong vortex formation behind the broad
brim, draws more mass flow to the wind turbine inside the diffuser shroud.
Keywords: wind turbine; diffuser; brim; power augmentation; wind tunnel experiment
1. Introduction
For the application of an effective energy resource in the future, the limitation of fossil fuels is clear
and the security of alternative energy sources is an important subject. Furthermore, due to concerns for
environmental issues, i.e., global warming, etc., the development and application
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