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Journal of Applied Mechanics and Technical Physics

2002 year, number 4

Structure of a supersonic jet with varied geometry of the nozzle entrance

V. I. Zapryagaev, A. V. Solotchin, and N. P. Kiselev
Institute of Theoretical and Applied Mechanics,
Siberian Division, Russian Academy of Sciences, Novosibirsk 630090
Pages: 538-543

Abstract

The structure of a supersonic
underexpanded low-pressure-ratio jet
exhausted from a nozzle with variable
geometry of the entrance section is
experimentally studied. Total pressure
distributions in the initial cross
sections of the examined jets are
obtained. Based on these distributions,
the coordinates of the mixing-region
boundaries are found. The curvature of
streamlines in the mixing layer within
the first two barrels of an
underexpanded jet is determined. A
dependence generalizing the measurement
results on the curvature of streamlines
in the first barrel of a weakly
underexpanded jet is obtained in
dimensionless coordinates.