CFD study of diffuser geometry effects on diffuser augmented wind turbine performance
Nortrup, Eric S.
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https://hdl.handle.net/2142/16977
Description
Title
CFD study of diffuser geometry effects on diffuser augmented wind turbine performance
Author(s)
Nortrup, Eric S.
Issue Date
2010-08-31T20:02:52Z
Director of Research (if dissertation) or Advisor (if thesis)
Hsia, K. Jimmy
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Diffuser augmented wind turbine (DAWT)
Abstract
This thesis aims to explore the performance limits of diffuser augmented wind turbines. Many studies of this topic have been performed in the past. Limiting assumptions and manufacturing concerns have forced the majority of previous studies to stray away from finding optimal performance in favor of economical construction. A momentum theory exists that shows the Betz limit can be exceeded by diffuser augmented wind turbines. In a multistage optimization study, geometry factors are considered and compared based on resulting power coefficients. In the final phase of the study a diffuser is chosen and compared to previously designed and tested diffusers. The new diffuser is the first to consider performance based not on rotor area, but on diffuser exit area. This diffuser exceeds the Betz limit based on diffuser exit area without considering the beneficial effects of blade tip vortices that have been found in multiple real-world tests.
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