Abstract
This paper deals with underexpanded sonic jets issuing from long circular pipes towards the atmosphere. The axisymmetric pseudo-shock waves caused by interference with the jet boundary layer were considerable in the jet. In order to investigate the mechanism and behavior of the shock waves, the pressure and velocity distributions in the jets were measured, and these results were compared with schlieren photographs. The inner diameters of the pipes used in these experiments were approximately 9, 13, and 16 mm, and the length was over sixty times each diameter. The experiments were carried out for mean Mach numbers, ranging from 1 to 1.6, at the pipe exit. In this investigation, the general mechanism and length of pseudo-shock waves and the correlation between the static pressure and velocity distributions in jet were clarified for various Mach numbers and three kinds of pipe diameters.
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