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Measurements of Instability in Supersonic Flow with Injection by Time-Resolved Flow Visualization

Schmidt, B. E. and Shepherd, J. E. (2016) Measurements of Instability in Supersonic Flow with Injection by Time-Resolved Flow Visualization. In: 54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2016-0599. ISBN 9781624103933. https://resolver.caltech.edu/CaltechAUTHORS:20190816-130553141

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Abstract

Experiments were performed in a Mach 4 Ludwieg tube to examine the transition process in flow over a sharp cone with boundary layer injection. Full-field images with nitrogen, helium and RC-318 injection reveal that transition occurs earlier with higher injection rates and with lighter injected gas. High-speed imaging at 290 kHz allows the measurement of wavelength and convective velocity by auto- and cross-correlation, respectively, in the cases with nitrogen injection. The wavelength is found to be approximately 8 mm with a convective velocity of 515 m/s, resulting in a frequency range of 60-70 kHz. These properties of the instability waves are roughly constant over all injection rates tested even though the thickness of the injection layer varies by a factor of two.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2016-0599DOIArticle
ORCID:
AuthorORCID
Schmidt, B. E.0000-0001-9193-7760
Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2016 American Institute of Aeronautics and Astronautics. Published Online: 2 Jan 2016. Thanks to Bahram Valiferdowsi, Ali Kiani, and Joe Haggerty for assistance with the models used in the present study. Additional thanks are due to Neal Bitter for insights into the transition process in supersonic flows. Bryan Schmidt acknowledges the support of Foster and Coco Stanback STEM Fellowship for his graduate studies.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Foster and Coco Stanback Postdoctoral FellowshipUNSPECIFIED
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AIAA Paper2016-0599
Record Number:CaltechAUTHORS:20190816-130553141
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190816-130553141
Official Citation:Measurements of Instability in Supersonic Flow with Injection by Time-Resolved Flow Visualization. Bryan E. Schmidt and Joseph Shepherd. 54th AIAA Aerospace Sciences Meeting. January. doi: 10.2514/6.2016-0599
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97955
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Aug 2019 20:22
Last Modified:03 Oct 2019 21:36

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