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oai:www.ideals.illinois.edu:2142/16977 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Hsia, K. Jimmy Nortrup, Eric S. 2010-08-31T20:02:52Z 2010-08-31T20:02:52Z 2012-09-07T16:43:33Z 2010-08-31T20:02:52Z 2010-08 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. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-07-21T17:15:45Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Nortrup_Eric.pdf: 680414 bytes, checksum: d9fbef7c24f05aef5110efa0cc45cf55 (MD5) Made available in DSpace on 2010-08-31T20:02:52Z (GMT). No. of bitstreams: 3 Nortrup_Eric.pdf: 680414 bytes, checksum: d9fbef7c24f05aef5110efa0cc45cf55 (MD5) 1_Nortrup_Eric.pdf: 680619 bytes, checksum: deb39821673de1211b60b53103f2c805 (MD5) license.txt: 4062 bytes, checksum: 466ad2c6233002c9f342f5809010c338 (MD5) Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2010-08-31T20:04:49Z Item is restricted until 2012-08-31T20:04:44Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2012-09-07T16:43:33Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 3 Nortrup_Eric.pdf: 680414 bytes, checksum: d9fbef7c24f05aef5110efa0cc45cf55 (MD5) 1_Nortrup_Eric.pdf: 680619 bytes, checksum: deb39821673de1211b60b53103f2c805 (MD5) license.txt: 4062 bytes, checksum: 466ad2c6233002c9f342f5809010c338 (MD5) Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2012-09-07T16:43:33Z http://hdl.handle.net/2142/16977 en Copyright 2010 Eric Sam Nortrup Diffuser augmented wind turbine (DAWT) CFD study of diffuser geometry effects on diffuser augmented wind turbine performance Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Thesis M.S. MS:Mechanical Engineerng -UIUC 10KS0133MSU