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Interpretation of spray behavior in complex aerodynamic flows using phase Doppler interferometry and planar-liquid-laser-induced fluorescence

The increasing need to mitigate pollutants produced by liquid fired combustion systems is leading to critical assessment of current systems in an effort to sufficiently refine them. These systems typically feature complex aerodynamic flows which serve to stabilize the reaction and are often the result of years of trail and error testing. In order to advance current systems suitable for future environmentally sensitive applications, basic understanding of the processes occurring is required. Recent developments in optical diagnostic techniques are providing the opportunity to attain such understanding. The present work applies a relatively well established technique (phase Doppler interferometry - PDI) to study the complex behavior of two-phase flows. PDI provides a wealth of information about the droplet size and velocity distributions as well as droplet concentration at discrete points within the flow. In addition, a relatively new technique (planar liquid laser induced fluorescence - PLLIF) is applied in order to extend the understanding of the structure of the flow. The PLLIF technique provides, in principle, the spatial distribution of liquid mass within a plane through the spray. This information is important because, in combustion systems, the homogeneity of the spatial distribution of fuel can play a significant role in the formation of pollutants. The results demonstrate the utility and potential limitations of the PLLIF technique. In addition, basic understanding of the complex flow structure is provided by combining the results from the two techniques.