Wave structure of the gas flow in a truncated nozzle with a long bell-shaped tip

In recent years, more and attention has been paid to nozzles with an unconventional profile, which differs from that of the classical streamline-profiled Laval nozzle. such nozzles, flow fields typically include interacting supersonic subsonic flows, often recirculation regions a complex wave structure flow. This work is concerned numerical study gas in truncated nozzle elliptical bell-shaped tip whose length long comparison conical section upstream tip. The inside surrounding space was simulated using ANSYS software package. calculations were carried out non-stationary axisymmetric formulation based on Reynolds-averaged Navier–Stokes equations closed use SST turbulence model near-wall functions compressibility correction. calculations, inlet pressure ambient varied. correctness methodological approaches solution problem confirmed authors’ previous works. showed following. At low values (P0 < 50 bar) 1 bar, wall exhibits developed separation zone large-scale vortex small-scale one (near exit). first "barrel" outflowing shows "saddle" low-intensity compression structure. case separated flow, about 15% less than pressure. P0 > 100 nearly proportional upper atmosphere, when going radial direction axis at exit cross-section, static monotonically decreases, reaches minimum, then increases linearly its maximum value wall. sea-level pressure, cross-section behaves same manner for pressures bar. = there exist two extrema: deceases minimum value, decreases slightly