The static tests of an experimental, point-design, shrouded plug nozzle are the focus of current experimental and computational efforts. Unlike a conventional plug nozzle, the presence of a shroud results in converging-diverging nozzlelike behavior at off-design nozzle pressure ratios and a return to conventional plug nozzlelike behavior at design conditions. The static experimental tests brought to light unsteady characteristics related to shock/shock and shock/boundary-layer interactions at off-design and steady-operational characteristics at design conditions. Through a series of axisymmetric computations, the flow structure, unsteady characteristics, and static pressure distributions are analyzed in conjunction with the experiments. The computational results are in good agreement with experimental observations and are found to be a fast, efficient way of understanding the experimental data and, thereby, the nature of shrouded, plug-nozzle flowfields.

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