  We consider two cases of interaction between a planar shock and a cylindrical
density interface. In the first case (planar normal shock), the axis of the gas
cylinder is parallel to the shock front, and baroclinic vorticity deposited by
the shock is predominantly two-dimensional (directed along the axis of the
cylinder). In the second case, the cylinder is tilted, resulting in an oblique
shock interaction, and a fully three-dimensional shock-induced vorticity field.
The statistical properties of the flow for both cases are analyzed based on
images from two orthogonal visualization planes, using structure functions of
the intensity maps of fluorescent tracer pre-mixed with the heavy gas. At later
times, these structure functions exhibit power-law-like behavior over a
considerable range of scales. Manifestation of this behavior is remarkably
consistent in terms of dimensionless time defined based on Richtmyer's linear
theory within the range of Mach numbers from 1.1 to 2.0 and the range of gas
cylinder tilt angles with respect to the plane of the shock front (0 to 30
degrees).
