The interaction of a cylindrical converging shock wave with a sinusoidal bounded light-heavy interface in converging shock tube is studied using high-speed schlieren photography. Based on the shock dynamics, the converging test section of the shock tube is well-designed to convert a planar shock wave with an incident shock Mach number of Ma=1.2 into a cylindrical converging one. The soap film technique is adopted to form an initial interface with a sinusoidal shape, separating light gas (air) from heavy gas (SF6). Illuminated by a DC regulated light source, the evolution of the sinusoidal bounded interface after the passage of the incident cylindrical shock and reshock is captured by the high-speed video camera during a single test run and the wave patterns are observed. It is indicated that after the incident shock impact with the interface, the evolution of the sinusoidal bounded interface is promoted in stream-wise due to the increasing of the shock strength, and suppressed in span-wise due to the boundary wall effect. Subsequently, after the reshock passage through the evolving interface, a phase reversal will appear on the crest and the trough, followed by a rapid growth of the perturbation. The motion of the flow filed will be intensified and turbulent mixing dominates the flow filed eventually. Compared with a planar shock case, the variation of the shock strength and the effect of the boundary wall will result in different flow features.
