Abstract

A separated flow in a truncated ideal contour nozzle due to overexpansion is studied numerically for different pressure ratios. The classical pattern of a FSS is obtained for very low and high pressure ratios. Between these two ranges of pressure ratios, an uncommon cap shock pattern without reattachment of the boundary layer appears. The influence of the thick base annulus height on the separated nozzle flow is also studied. The results are then compared and validated using experimental data. This article was chosen from Selected Proceedings of the 1st French Seminar on Turbulence and Space Launchers (CNES-Paris, 13-14 June 2002) ed P Vuillermoz, P Comte and M Lesieur.

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