Abstract
Two-dimensional supersonic jet flows of air have been investigated by optical methods. The density distributions on the boundary of the jets under full expansion, over pressure and under pressure conditions at various Mach numbers were measured by an interferometer. The density distributions are of the form of error functions. For the full expansion and the over pressure cases, there is no interaction between the boundary layer flow and the flow in the core of the jet. The divergence of the jet mixing region decreases with increase of Mach number. For the under pressure case, there is interaction between the boundary layer and the shock. The shock is curved and the flow field behind the shock is non-uniform.
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