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This paper describes an experimental investigation of the initial region of subsonic coaxial jets of three different mean-velocity ratios λ higher than unity. Detailed measurements have found similarity of the mean velocity and turbulence intensity profiles within the three zones: initial merging, intermediate, and fully merged zone. Similarity with single jet results has been found. In the inner mixing region, however, only the similarity of the mean velocity profiles has been found.

The flow behind two circular cylinders of different diameters, which were joined coaxially has been examined at the Reynolds number of 8 × 104. The detailed pressure spectral measurements indicate the shedding and the distributions of the pressure fluctuations of the vortex wakes associated with the big and small cylinders. The effect of the presence of the small vortex wake on the vortex shedding of the big cylinder and the interaction between them is presented. The wake formed behind the plane of discontinuity has been isolated and presented.

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