Abstract
The design and performance of two unique fluidized bed particle seeders were assessed experimentally. The seeders were designed to seed the fuel stream and freestream of a scramjet combustor for particle image velocimetry measurements. The fuel stream seeder used alumina powder to generate particles and has been used in the past to obtain particle image velocimetry measurements. The freestream seeder used silica powder and is a new design. Using a probe and filter paper, samples were collected from the output of each seeder at operating conditions near those encountered in scramjet particle image velocimetry studies. The samples were imaged using a scanning electron microscope to obtain qualitative and quantitative data about the particles generated. Both seeders produced particles near the target size of 0.3 μm, although the silica particles were generally smaller in size and more spherical than the alumina particles. Based on these results, it was predicted that the freestream particles would scatter light more uniformly and track the flow more faithfully than the fuel stream particles. The results of this study confirm assumptions on particle size and shape made in previous particle image velocimetry experiments and also indicate that the fuel stream seeder will generate more effective particles using silica powder.
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