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

摘要: 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 are both on a leading-edge configuration, the values recompression neck position thickness compared between methods. It is seen that lithium seeding in RESI technique has discernible effect behavior, changing motion forebody shock wave during experiment with unseeded flow, also appears prevent from moving further downstream tunnel run flow. seeded itself found only enhance density gradients first 550 µs time. PLIF images consistent results for within measurement uncertainty, indicating RE...