rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Tollmien-Schlichting and Crossflow Instability Mode Selection on Swept Wings
  name:
    name part: Feliciano, Jeppesen G
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: White, Edward
    role:
      role term: thesis advisor.
  name:
    name part: Texas A&M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2023
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Transport aircraft consume significant fuel and produce commensurate pollution. In-creasing the extent of laminar flow over wings is one strategy to reduce skin friction drag and thus decrease fuel consumption. The boundary layer on swept wings can transition to turbulence due to Tollmein-Schlichting (TS) waves and stationary crossflow vortices. The growth of each instability is well-modeled by stability theory codes, particularly those driven by the parabolized stability equations. However, the realization of a particular mode or a mix of both is highly dependent on mode selection: the combined effects of the receptivity process and initial growth rates. This phenomenon has not been rigorously explored. What is needed is an experiment that demonstrates the possible modes in a range of sweep, pressure distribution, and disturbance conditions to guide simulations regarding what instabilities may exist in what conditions. To achieve this, a slotted, natural-laminar flow airfoil model and a mount that provides variable sweep and pitch were designed and installed in the Klebanoff-Saric Wind Tunnel. Modes were forced according to their receptivity properties. When the TS mode was amplified, 2-D roughness strips and sound pressure were applied; crossflow was forced with DRE arrays. Under single-amplified conditions, TS and crossflow modes were individually selected in the boundary layer. When both modes were amplified, TS and crossflow were selected in-dividually and simultaneously; modes coexisted in the boundary layer. Mixed-mode forcing produced weak stationary crossflow vortices and strong TS waves that nonlinearly inter-acted and led to an earlier breakdown compared to single-mode forcing. Altogether, these results mapped out the possible modes within the range of parameters, building confidence in stability calculations that can be extended to design-operating conditions. The electronic version of this dissertation is accessible from https://hdl.handle.net/1969.1/19…
  note: by Jeppesen Feliciano.
  note: "Major Subject: Aerospace Engineering"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/198644
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Aerospace Engineering
  subject:
    topic: boundary-layer stability
  subject:
    topic: boundary-layer receptivity
  subject:
    topic: crossflow
  subject:
    topic: Tollmien-Schlicting
  subject:
    topic: swept wing
  identifier: https://hdl.handle.net/1969.1/198644
  record info:
    record content source: TXA
    record creation date: 241105
    record change date: 20250326141429.9
    record identifier: in00005621220
    language of cataloging:
      language term: eng