Abstract
An underexpanded jet issuing from a circular nozzle is used for many industrial applications such as an assist gas for the laser cutting, a cooling jet for the glass tempering process and so on. The impinging jet on a flat plate can be considered to be a simple model of such flow field. In this paper, the oscillatory behavior of impinging jet is numerically studied by solving three dimensional Euler equations using TVD scheme. As a result, the oscillation of the impinging jet is found to be associated with the spiral motion of the free jet and so, the disturbances around the wall jet propagate in the radial and the circumferential direction simultaneously. Furthermore, an irregular oscillation caused by the behavior of the separation bubble in the jet is also discussed.
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