MIT Libraries homeMIT Libraries logoDSpace@MIT

MIT
View Item 
  • DSpace@MIT Home
  • MIT Libraries
  • MIT Theses
  • Theses - Dept. of Aeronautics and Astronautics
  • Aeronautics and Astronautics - Ph.D. / Sc.D.
  • View Item
  • DSpace@MIT Home
  • MIT Libraries
  • MIT Theses
  • Theses - Dept. of Aeronautics and Astronautics
  • Aeronautics and Astronautics - Ph.D. / Sc.D.
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Characterization and mitigation of blade waviness effects on fan performance

Author(s)
Lee, Jinwook,Ph. D.Massachusetts Institute of Technology.
Thumbnail
Download1143739529-MIT.pdf (32.49Mb)
Other Contributors
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics.
Advisor
Zoltán S. Spakovszky and Edward M. Greitzer.
Terms of use
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582
Metadata
Show full item record
Abstract
The role of surface waviness, arising from carbon composite manufacturing process, on aeroengine fan blade performance is characterized. The mechanisms for laminar-turbulent transition are assessed numerically and experimentally over relevant range of aerodynamic and geometric parameters. The governing mechanism (natural transition triggered by receptivity amplification from surface waviness) is explained based on a newly established numerical framework and validated experimentally. Computations and experiments are performed to assess the surface waviness loss mechanism under a relevant range of aerodynamic and geometric parameters. The major feature, with estimated isentropic efficiency loss up to 1%, is identified to be the movement of the natural transition location due to receptivity amplification, via geometric resonance between the Tollmien-Schlichting wavelength and the surface wavelength. An effective numerical framework, referred to as the extended eN method, is established to assess the occurrence of the start of transition by tracing the energy transfer from freestream acoustic disturbance to initiation and growth of Tollmien-Schlichting waves. A subsonic natural transition wind tunnel was designed and constructed to determine the effects of surface waviness on natural transition. The theoretical amplification of Tollmien-Schlichting waves, and the corresponding transition point movement due to surface waviness, is successfully validated by these experiments. The research contributes to aircraft engine fan blade technology through a new capability to estimate the effect of blade surface waviness on fan performance, characterization of the underlying mechanisms, and design guidelines for improvements of modern carbon composite fan blades.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2019
 
Cataloged from PDF version of thesis.
 
Includes bibliographical references (pages 235-240).
 
Date issued
2019
URI
https://hdl.handle.net/1721.1/124171
Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Publisher
Massachusetts Institute of Technology
Keywords
Aeronautics and Astronautics.

Collections
  • Aeronautics and Astronautics - Ph.D. / Sc.D.
  • Aeronautics and Astronautics - Ph.D. / Sc.D.

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

Login

Statistics

OA StatisticsStatistics by CountryStatistics by Department
MIT Libraries homeMIT Libraries logo

Find us on

Twitter Facebook Instagram YouTube RSS

MIT Libraries navigation

SearchHours & locationsBorrow & requestResearch supportAbout us
PrivacyPermissionsAccessibility
MIT
Massachusetts Institute of Technology
Content created by the MIT Libraries, CC BY-NC unless otherwise noted. Notify us about copyright concerns.