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Characterization of the Caltech Hypervelocity Expansion Tube via Tunable Diode Laser Absorption Spectroscopy

Schwartz, Tal and Girard, Julian and Finch, Peter M. and Yu, Wesley and Lawson, Joel M. and Strand, Christopher L. and Austin, Joanna M. and Hornung, Hans G. and Hanson, Ronald K. (2021) Characterization of the Caltech Hypervelocity Expansion Tube via Tunable Diode Laser Absorption Spectroscopy. In: AIAA Propulsion and Energy 2021 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2021-3524. ISBN 978-1-62410-611-8. https://resolver.caltech.edu/CaltechAUTHORS:20210901-150138936

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Abstract

We report on measurements of freestream velocity in the Caltech Hypervelocity Expansion Tube (HET) facility. A novel diagnostic was developed based on velocimetry with Tunable Diode Laser Absorption Spectroscopy (TDLAS) targeting the D1 line of nascent atomic potassium. Two experiments at the same nominal condition showed steady flow velocity during the test time and strong agreement between experiments, but a higher velocity than expected from 1D inviscid calculations and preliminary viscous simulations. The goal of these experiments is the characterization of freestream flow conditions in the HET. Future efforts will perform this velocity characterization at additional facility conditions, measure freestream gas state properties, and reduce the measurement uncertainty due to beam alignment.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2021-3524DOIArticle
https://doi.org/10.2514/6.2021-3524.vidDOIVideo
ORCID:
AuthorORCID
Girard, Julian0000-0002-8101-015X
Yu, Wesley0000-0002-1133-3199
Lawson, Joel M.0000-0002-3042-0909
Strand, Christopher L.0000-0002-4112-6668
Austin, Joanna M.0000-0003-3129-5035
Hornung, Hans G.0000-0002-4903-8419
Hanson, Ronald K.0000-0002-8030-5327
Additional Information:© 2021 by the American Institute of Aeronautics and Astronautics, Inc.
Group:GALCIT
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2021-3524
DOI:10.2514/6.2021-3524
Record Number:CaltechAUTHORS:20210901-150138936
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210901-150138936
Official Citation:Tal Schwartz, Julian Girard, Peter M. Finch, Wesley Yu, Joel M. Lawson, Christopher L. Strand, Joanna M. Austin, Hans G. Hornung and Ronald K. Hanson. "Characterization of the Caltech Hypervelocity Expansion Tube via Tunable Diode Laser Absorption Spectroscopy," AIAA 2021-3524. AIAA Propulsion and Energy 2021 Forum. August 2021; DOI: 10.2514/6.2021-3524
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110682
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Sep 2021 17:59
Last Modified:01 Sep 2021 17:59

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