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Description
Ray tracing is performed from a point source located on the axis of a cylindrical shear layer at a Mach number ranging up to Mj=2. In all cases, some of the rays originally directed upstream are guided by the jet flow. These guided jet rays (GJR) can be entirely or partially confined inside the jet depending on the Mach number and the ray initial angle. They can travel in the upstream or downstream directions, or not propagate axially. For subsonic Mach numbers, upstream-travelling GJR are found in all cases, and downstream-travelling GJR are observed above a threshold Mach number. For supersonic Mach numbers, both upstream- and downstream-travelling GJR exist. These results are consistent with the properties of the guided jet waves described in previous studies.