Abstract
The structure of a supersonic hot jet at Mach 1.8 injected into a coaxial supersonic flow at Mach 1.5 is analyzed by differential interferometry, the total pressure ratio being a variable parameter. Density profiles are deduced assuming the flow to be axisymmetric. The flow is characterized by a very stable region downstream of two conical shocks and by a region located between the injection plane and the second conical shock where viscosity is locally nonnegligible and the jet exhibits high gradients permitting the transition from injection conditions to the far-field stabilized flow conditions. Density profiles superimposed on the visualizations show that the minima are always located along the boundary of the potential cone and the reflected shocks and, further downstream, along the boundary between the inner and outer parts of the jet.
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