Interaction between shock wave and unsteady jet in shock tube

We have observed the interaction between a shock wave and an unsteady jet in shock tube. From the results of the experiment, we have reported that the interaction between the shock wave and the unsteady jet in a shock tube was very strong, and it temporarily generated a hemispherical reflected shock wave. However, we could not clarify the cause of the interaction because of the limits of the experiment. Therefore, we used a numerical computation to clarify it. The computation was carried out by solving axisymmetric viscous flow by means of the MacCormack method. The results obtained from the computations generally supported those expected from the experiment.