An investigation of the refraction of moving shock in a combination facility

An experimental study on the refraction of a shock at an interface (slip-surface) between moving and quiescent gases has been conducted in a combined facility of shock tunnel and shock tube. It was found that, unlike the early studies of Jahn (1956) and Abdel-Fattah and Henderson (1976, 1978a, b), the flow pattern which belongs to 'slow-fast' or 'fast-slow' refraction depends not only on the parameters on both sides of the slip-surface, but also on the shock itself. Another refraction pattern which has not appeared in the early papers is that, for a given condition of the slip-surface, there exists a shock strength such that the shock wave passes straight through the slip-surface without changing its direction and strength.