The numerical results of supersonic jet are non-dimensionalized by the nozzle exit diameter for the analysis of jet structures. Recently, the micro-nozzles of milli-m or micro-m size are used in industrial engineering. In these cases, it seems that the similarity in jet structures has not been guaranteed. This paper aims to clarify the influence of the nozzle diameter on the structure of under-expanded supersonic jet by numerical analysis. In this study, the jet structure, the location and the diameter of Mach disk, the sonic line and the boundary layer in the nozzle are analyzed decreasing the nozzle diameter from 12.7 mm.
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