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Transition Delay in Hypervelocity Boundary Layers by Means of CO₂/Acoustic Instability Interactions

Leyva, Ivett A. and Laurence, Stuart and Beierholm, Amy War-Kei and Hornung, Hans G. and Wagnild, Ross and Candler, Graham (2009) Transition Delay in Hypervelocity Boundary Layers by Means of CO₂/Acoustic Instability Interactions. In: 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2009-1287. ISBN 978-1-60086-973-0. https://resolver.caltech.edu/CaltechAUTHORS:20200117-080200964

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Abstract

A novel method to delay transition in hypervelocity flows over slender bodies by injecting CO₂ into the boundary layer of interest is investigated. The results presented here consist of both experimental and computational data. The experimental data was obtained at Caltech's T5 reflected shock tunnel, while the computational data was obtained at the University of Minnesota. The experimental model was a 5 degree sharp cone, chosen because of its relevance to axisymmetric hypersonic vehicle designs and the wealth of experimental and numerical data available for this geometry. The model was instrumented with thermocouples, providing heat transfer measurements from which transition locations were determined and the efficacy of adding CO₂ in delaying transition was gauged. For CO₂/N₂ freestream blends without injection, the transition Reynolds number more than doubled for mixtures with 40% CO₂ mole fraction compared to the case of 100% N₂. For the cases with injection, shadowgraph visualizations were obtained, allowing verification of the injection timing. The computations provide encouraging results that for the injection schemes proposed CO₂ is reaching high enough temperatures to excite vibrational modes and thus delay transition.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2009-1287DOIArticle
ORCID:
AuthorORCID
Hornung, Hans G.0000-0002-4903-8419
Additional Information:This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Published online: 15 Jun 2012.
Group:GALCIT
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Other Numbering System NameOther Numbering System ID
AIAA Paper2009-1287
Record Number:CaltechAUTHORS:20200117-080200964
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200117-080200964
Official Citation:Transition Delay in Hypervelocity Boundary Layers by Means of CO2/Acoustic Instability Interactions. Ivett Leyva, Stuart Laurence, Amy Beierholm, Hans Hornung, Ross Wagnild, and Graham Candler. 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. January 2009; doi: 10.2514/6.2009-1287
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100779
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Jan 2020 17:17
Last Modified:17 Jan 2020 17:17

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