Hydroxyl Tagging Velocimetry in Cavity-Piloted Mach 2 Combustor (Postprint)
VANDERBILT UNIV NASHVILLE TN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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Hydroxyl tagging velocimetry HTV measurements of velocity were made in a Mach 2 scramjet combustor with a wall cavity flameholder. In the HTV method, ArF excimer laser 193 nm beams pass through a humid gas flow and dissociate H2O into H OH to form a tagging grid of OH molecules. Previously demonstrated with a 7x7 grid of hydroxyl OH molecules, HTV is now demonstrated with an 11x11 grid of OH tracked by planar laser-induced fluorescence to yield about 120 velocity vectors of the two-dimensional flow over a fixed time delay. Instantaneous, single-shot measurements of two-dimensional flow patterns were made in the non-reacting Mach 2 flow from step to step in the cavity under low- and high-backpressure conditions. Single-shot profiles were analyzed to yield mean and rms velocity profiles in the Mach 2 non-reacting flow. A set of velocity data spanning the entire length of the cavity for an open wall cavity in a supersonic flow under low and high backpressure conditions was compiled for validation of CFD models.
- Fluid Mechanics