Study of deposition control using transpiration

The introductory experimental phase of a study to determine the conditions under which transpiration may be used to avoid the deposition of small particles was undertaken. The application of this work is to control the deposition of small particles over a surface kept at a temperature below the melting point of compounds likely to exist in the combustion products. Laser beam attenuation methods were used to measure the distribution of glass beads, ranging in size from 1 to 37 microns in a wind tunnel's flow atmosphere. The method of laser beam attenuation measurements is sound and gives indications of its suitability for continued use in modeling applications of this nature.