Abstract
Hydroxyl tagging velocimetry (HTV) is reviewed in this paper. HTV is a velocity method that determines the molecular velocity of humid air and combustion flows without additives. In the HTV method, multiple beams of ArF excimer laser (193 nm) light pass through a H2O-laden gas flow and dissociate H2O into H + OH to form a tagging grid of hydroxyl (OH) molecules. The OH grid is tracked over a finite-time interval by laser-induced fluorescence to measure the velocity by time-of-flight. Micro-lens optics have been used to form grids as large as 11x11 to yield ~120 velocity vectors of the two-dimensional flow over a fixed time delay. Instantaneous, single-shot measurements of two-dimensional flow patterns as well as mean and rms profiles are reported in supersonic non-reacting flows and gas turbine exhausts.
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