Study of blast-bow wave interactions in a shock tube and shock tunnel.

A double-driver shock tube was developed firing tandem shocks to study the interaction of a (second) shock with a bow shock (established by the first shock). The model was mounted at the open end of the tube. For observing real-air effects (to 7900 °K, 210 atm) on the interactions, a high-energy shock tube was used. The stagnation-point pressure had a peak jump of 1.3 to 1.85 times the steady-state jump. Several one-dimensional and three-dimensional theoretical methods for predicting the stagnation-point pressure are evaluated in comparison with the data.