Abstract. The behavior of supersonic mixing layers under three x conditions has been examined by schlieren photography and laser y Doppler velocimetry. In the schlieren photographs, some largeYo scale, repetitive patterns were observed within the mixing layer; ( however, these structures do not appear to dominate the mixing layer character under the present flow conditions. It was found that 7 higher levels of secondary freestream turbulence did not increase the b peak turbulence intensity observed within the mixing layer, but slightly increased the growth rate. Higher levels of freestream turbu-~/ lence also reduced the axial distance required for development of the 0 mean velocity. At higher convective Mach numbers, the mixing # layer growth rate was found to be smaller than that of an incompressible mixing layer at the same velocity and freestream density a ratio. The increase in convective Mach number also caused a de~b crease in the turbulence intensity (a./A U).

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The behavior of supersonic mixing layers under three x conditions has been examined by schlieren photography and laser y Doppler velocimetry. In the schlieren photographs, some large-Yo scale, repetitive patterns were observed within the mixing layer;( ) however, these structures do not appear to dominate the mixing layer character under the present flow conditions. It was found that 7 higher levels of secondary freestream turbulence did not increase the 6 peak turbulence intensity observed within the mixing layer, but slightly increased the growth rate. Higher levels of freestream turbu-~/ lence also reduced the axial distance required for development of the 0 mean velocity. At higher convective Mach numbers, the mixing Ft layer growth rate was found to be smaller than that of an incom-0 pressible mixing layer at the same velocity and freestream density a ratio. The increase in convective Mach number also caused a de-~b crease in the turbulence intensity (%/A U).

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