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Turbulent Spot Observations within a Hypervelocity Boundary Layer on a 5-degree Half-Angle Cone

Jewell, Joseph S. and Parziale, Nicholaus J. and Leyva, Ivett A. and Shepherd, Joseph E. (2012) Turbulent Spot Observations within a Hypervelocity Boundary Layer on a 5-degree Half-Angle Cone. In: 42nd AIAA Fluid Dynamics Conference and Exhibit. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2012-3062. ISBN 9781600869334. https://resolver.caltech.edu/CaltechAUTHORS:20190826-092412321

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Abstract

Laminar to turbulent transition is a critically important process in hypersonic vehicle design. Higher thermal loads, by half an order of magnitude or more, result from the increased heat transfer due to turbulent flow. Drag, skin friction, and other flow properties are also significantly impacted. Transition to turbulence in initially laminar boundary layers can occur along many paths. In low-speed flow under ideal conditions (quiet freestream, nominally smooth surfaces with favorable or zero pressure gradient and minimal crossflow) transition occurs over a finite distance and is associated with the creation and growth of propagating patches of turbulent flow, known as turbulent spots. Spots may be due to the breakdown of linear instabilities or induced by “bypass mechanisms” associated with nonideal effects in the flow or model. H.W. Emmons (1951) was the first to propose that laminar boundary layers break down through the convergence of spots, after observations of a water-table analogy to air flow. Spot formation has been studied extensively in subsonic flows, a recent review of past and current work on spots in incompressible flows is given by Strand and Goldstein (2011).


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2012-3062DOIArticle
ORCID:
AuthorORCID
Jewell, Joseph S.0000-0002-4047-9998
Parziale, Nicholaus J.0000-0001-9880-1727
Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2012 American Institute of Aeronautics and Astronautics. The authors thank Mr. Bahram Valiferdowsi for his work with design, fabrication, and maintenance, and Prof. Hans Hornung for his advice and support. This project was sponsored by the Air Force Office of Scientific Research under award number FA9550-10-1-0491 and the NASA/AFOSR National Center for Hypersonic Research. The views expressed herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of AFOSR or the U.S. Government.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-10-1-0491
NASA/JPL/CaltechUNSPECIFIED
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AIAA Paper2012-3062
Record Number:CaltechAUTHORS:20190826-092412321
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190826-092412321
Official Citation:Turbulent Spot Observations within a Hypervelocity Boundary Layer on a 5-degree Half-Angle Cone Joseph Jewell, Nicholaus Parziale, Ivett Leyva, and Joseph Shepherd 42nd AIAA Fluid Dynamics Conference and Exhibit. https://doi.org/10.2514/6.2012-3062
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98216
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:26 Aug 2019 17:23
Last Modified:03 Oct 2019 21:39

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