Abstract
Cold spray is a relatively new coating technology that produces deposits by high velocity impact of feed stock powders onto the substrate in order to impart corrosion resistance, abrasion resistance and so on. The purpose of this study is to clarify the flow conditions in the supersonic nozzle for cold spray. We measured the static pressure of the divergent nozzle using the pressure sensors attached to the nozzle. In addition, one-dimensional numerical analysis was performed, and was compared with the experimental result. As a result, the choked position in the experiment was found to be different from the one-dimensional analysis by the gasdynamic throat. Therefore, we calculated the position of the gasdynamic throat by the formula derived from theoretical analysis of quasi-one dimensional steady flow of insulation friction. However the error was negligible. Thus, the formula could not be used in this study. Assuming that there is the gasdynamic throat, the result of one-dimensional analysis was close to the experimental values.
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