The air-flow pattern through the separator was found to be the controlling factor in its performance. The most desirable pattern prevailed when the velocity of the blowdown portion of the inlet air stream was constant from inlet to blowdown. Particle-path studies showed that an effective louver blade shape separates the region of particle impacts with the blades from the region where the air is passing between the blades. An approximate analysis of the particle paths was developed, which is helpful in explaining the trends in the experimental data.

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