OH PLIF visualization of a premixed ethylene-fueled dual-mode scramjet combustor

LML Cantu, ECA Gallo, AD Cutler… - 54th AIAA Aerospace …, 2016 - arc.aiaa.org
54th AIAA Aerospace Sciences Meeting, 2016arc.aiaa.org
Planar laser induced fluorescence (PLIF) 1 is an instantaneous, spatially-resolved optical
measurement technique that involves molecular excitation for both quantitative
measurements and flow visualization. A laser, first expanded into a planar sheet and then
focused in the measurement region, is tuned to a specific absorption transition of the target
molecule; for a certain finite time (depending on the laser pulse duration and the
fluorescence life time), a spontaneous emission of radiation from an upper energy level …
Planar laser induced fluorescence (PLIF) 1 is an instantaneous, spatially-resolved optical measurement technique that involves molecular excitation for both quantitative measurements and flow visualization. A laser, first expanded into a planar sheet and then focused in the measurement region, is tuned to a specific absorption transition of the target molecule; for a certain finite time (depending on the laser pulse duration and the fluorescence life time), a spontaneous emission of radiation from an upper energy level (fluorescence) is emitted from the illuminated region. When the molecule emits energy at the same wavelength the process is called resonance fluorescence. Usually some energy can be lost due to molecular collisions, a process known as collisional quenching. Collisions may also cause rotational and vibrational energy transfers to other adjacent states, resulting in additional spontaneous fluorescence emission lines at longer wavelengths compared to the laser. A schematic representation of this process is shown in the energy diagram in Figure 1.
AIAA Aerospace Research Center
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