@inproceedings{f46e627de99e4ae7adaba61552df6a0f,
title = "Comparison of density-sensitive and fluorescence visualization in low-density separated flow",
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.",
author = "Tremayne Kaseman and {Le Page}, Laurent and Sean O'Byrne and Harald Kleine and Sudhir Gai",
year = "2016",
month = nov,
day = "15",
doi = "10.1063/1.4967573",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Henning Struchtrup and Andrew Ketsdever",
booktitle = "30th International Symposium on Rarefied Gas Dynamics, RGD 2016",
address = "United States",
note = "30th International Symposium on Rarefied Gas Dynamics, RGD 2016 ; Conference date: 10-07-2016 Through 15-07-2016",
}