• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    SEPARATION AND CIRCULATION CONTROL ON A THICK BLUNT ELLIPTICAL AIRFOIL

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_etd_10442_sip1_m.pdf
    Size:
    71.77Mb
    Format:
    PDF
    Description:
    azu_etd_10442_sip1_m.pdf
    Download
    Author
    Chen, Chunmei
    Issue Date
    2009
    Advisor
    Wygnanski, Israel J.
    Committee Chair
    Wygnanski, Israel J.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Various methods of Active Flow Control (AFC) were experimentally investigated on an elliptic airfoil to improve our understanding of the flow mechanisms and identify the parameters, governing fluidic control of separation and circulation. Steady blowing, steady suction and Zero Mass Flux Forcing (ZMFF) were applied to enhance the performance of the airfoil at all possible parts of the flight envelope. All three modes of actuation were two dimensional. The unique design of the model enabled one to vary the slot-widths, their locations and their orientations, without a change of hardware. Changes in the free stream velocity, amplitudes and frequencies of the periodic forcing, or mass flow associated with the steady suction or blowing were also investigated. Wedges attached to the trailing edge of the ellipse modified the shape and sharpness of the trailing edge thus determining the Kutta condition rather than letting it be freely established by the AFC. For steady blowing the increment of the lift coefficient scales with the momentum coefficient (C(μ)), provided that the slot is thin. The lift increment generated by the blowing is adversely affected by wider slots and a deleterious effect on C(L) was observed at low C(μ). The lift increment was independent of Reynolds numbers of the airfoil and the jet but it depended on the slot location and orientation. An imposed Kutta condition, even when carried out by a small protuberance had a significant effect on C(L). The drag was not necessarily reduced by the blowing and C(μ) was not its primary scaling parameter. Suction is much more effective than blowing at low levels of C(μ). Neither C(μ), nor volume flow coefficient, C(Q), provides universal relation for suction. ZMFF is most effective in reattaching separated flow but the traditional does not provide the universal scaling for ZMFF. Much higher level of input was required to attach separated flow than to keep the flow attached.
    Type
    text
    Electronic Dissertation
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Aerospace Engineering
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.