Abstract
A non-intrusive laser diagnostic known as molecular tagging velocimetry was used to find quantitative off-body velocity measurements in the wake of a sphere in the Mach 7 Ludwieg Tube Wind Tunnel located at The University of Texas at San Antonio. Acetone gas seeded in the flow was excited using the 4th harmonic of a pulse-burst Nd:YAG laser. The experimental results were used to validate and compare to simulations using a continuous Galerkin flow solver. Both the experimental and simulated results agreed on negative velocities in the viscous shear layer. Near the centerline of the sphere, average velocities of-200 m/s were observed due to reverse flow in the recirculation region. Outside of the shear layer, velocities of 800 m/s were observed in both the experimental and simulated results. The overall average uncertainty for the strut-mounted and free-flight case was estimated to be ±27 m/s. The flow features of the wake were visualized using schlieren imaging, and the experimental results agreed well with the simulated results.
| Original language | English |
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| Title of host publication | AIAA Aviation Forum and ASCEND, 2024 |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| ISBN (Print) | 9781624107160 |
| DOIs | |
| State | Published - 2024 |
| Event | AIAA Aviation Forum and ASCEND, 2024 - Las Vegas, United States Duration: Jul 29 2024 → Aug 2 2024 |
Publication series
| Name | AIAA Aviation Forum and ASCEND, 2024 |
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Conference
| Conference | AIAA Aviation Forum and ASCEND, 2024 |
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| Country/Territory | United States |
| City | Las Vegas |
| Period | 07/29/24 → 08/2/24 |
Funding
This research was supported by Oak Ridge National Laboratory under award number DE-AC05-00OR22725. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of Oak Ridge National Laboratory or the U.S. Government. The authors would also like to thank Patrick Hughes and Rafael Lopez from the Hypersonics Lab at UTSA for their help in this study.