Inviscid gas flows in nozzles with a steeply converging contour

Inviscid gas flows in nozzles with a uniform exit flow and contours profiled starting from the lower point of a steeply converging region with an angle theta = -90A degrees are analyzed. It is shown that there exists a class of convergent-divergent contours, within which the flow is characterized by the fact that the line theta = 0 of zero angle of the velocity vector inclination to the x axis consists of two oppositely-directed regions located partially or even completely ahead of the minimum section, while near the minimum sections their regions convex inward the gas stream are in decelerated flow. The minimum sections of the nozzles with M (e) -> 1 approach the center of the nozzle from the right.