Comparison of density-sensitive and fluorescence visualization in low-density separated flow

Tremayne Kaseman*, Laurent Le Page, Sean O'Byrne, Harald Kleine, Sudhir Gai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)

Abstract

This paper compares two methods used to visualize low-density hypersonic separated flow fields: resonantly enhanced shearing interferometry (RESI) and planar laser-induced fluorescence (PLIF) of nitric oxide. The two methods are both used on a leading-edge separated flow configuration, and the values of the recompression neck position and thickness are compared between the two methods. It is seen that the lithium seeding in the RESI technique has a discernible effect on the flow behavior, changing the motion of the forebody shock wave during the experiment compared with unseeded flow, and the seeding also appears to prevent the recompression neck from moving further downstream during the tunnel run compared with the unseeded flow. The seeded lithium itself is also found to only enhance the density gradients in the flow during the first 550s of flow time. The PLIF images are consistent with the RESI results for both neck position and thickness to within the measurement uncertainty, indicating that the RESI is not significantly influenced by 3D effects, but that the seeding of lithium required for the RESI does appear to have an effect on the position of the recompression neck and of the forebody shock after the test time. The thickness and location of the recompression neck is not significantly different for leading-edge radii of 10 and 30 μm.

Original languageEnglish
Title of host publication30th International Symposium on Rarefied Gas Dynamics, RGD 2016
EditorsHenning Struchtrup, Andrew Ketsdever
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414488
DOIs
Publication statusPublished - 15 Nov 2016
Externally publishedYes
Event30th International Symposium on Rarefied Gas Dynamics, RGD 2016 - Victoria, Canada
Duration: 10 Jul 201615 Jul 2016

Publication series

NameAIP Conference Proceedings
Volume1786
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference30th International Symposium on Rarefied Gas Dynamics, RGD 2016
Country/TerritoryCanada
CityVictoria
Period10/07/1615/07/16

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