Interaction Between Reflected Shock Wave and Nonsteady Jet in Shock Tube Experiment : 1st Report, The Behavior of Reflected Shock Wave

Nitrogen or hydrogen gas is set to spurt from a small circular hole located at the endplate of shock tube at about 0∼9 ms before the shock wave arrives and reflects there. Interacting with the jet the reflected shock wave changes its shape from a plane shock wave to a curved one. We observed the phenomenon by the use of a schlieren system, time counters and pressure gauges. The results of the observation are as follows : (1) It is confirmed that an unstable, curved, reflected shock wave turns back to a stable plane shock wave within 0.1 ms. (2) The pressure and the temperature values behind the reflected shock wave derived from its distance-time relation show a certain amount of jump, which indicates the amount of the interaction between the spurting gas and the shock wave. (3) It is seen that hydrogen jet starts to burn at about 500∼600μ s after the shock reflection is taken place.