Interaction between reflected shock wave and unsteady jet in shock tube. (3rd Report, Numerical analysis about the interaction between reflected shock wave and unsteady jet).

We have observed the interaction between a shock wave and an unsteady jet in a 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 hemispherically reflected shock wave. We could not clarify the cause of the interaction because of the limits of the experiment. Therefore, we used numerical computation to clarify it. The computations were carried out by solving two-dimensional Eulertype equations by means of the FLIC method. The results obtained from the computation generally supported those expected from the experiment. The results are summarized as follows : (1) The interaction between a reflected shock wave and the jet was very strong and it temporarily generated a hemispherical reflected shock wave. (2) The pressure, density and temperature of the apex of the hemispherical reflected shock wave were estimated to be 2 to 3 times higher temporarily, than those of the reflected shock wave in the absence of the jet.