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Journal of engineering physics

, Volume 20, Issue 5, pp 648–654 | Cite as

Investigation of the closing shock in a supersonic submerged underexpanded gas jet

  • V. I. Nemchenko
Article
  • 36 Downloads

Abstract

The geometry of the closing compression shock and the boundary of a submerged underexpanded gas jet are investigated. The self-similarity of the initial section of the jet at high pressures and the disturbance of the self-similarity as the stream density diminishes are shown experimentally.

Keywords

Statistical Physic High Pressure Compression Shock Initial Section Stream Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notation

p

pressure

T

temperature

γ

ratio of specific heats

ζ

shock intensity

n

ratio between the pressure at a nozzle section and the pressure in the vacuum chamber

M

Mach number

K

Knudsen number

C=K* √n

rarefaction parameter

A, A1, F

proportionality coefficients in empirical formulas describing the closing shock geometry

S

nozzle cross-sectional area

d

nozzle diameter

r

nozzle radius

ξ

half-angle of a conical nozzle

L

geometric closing shock dimension

x0

distance to the closing shock along the jet axis

ω

angle of incidence of the hanging compression shock

ω

angle of reflection of the hanging compression shock

x

distance along the jet axis

y

distance across the jet

k

proportionality coefficient

b

some constant

Subscripts

0

parameter in the adiabatically frozen stream

*

parameter in the critical nozzle section

a

parameter at the nozzle exit

l

limit value

c

parameter in the satellite stream

b

parameter in the vacuum chamber

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Literature cited

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Copyright information

© Consultants Bureau, a division of Plenum Publishing Corporation 1973

Authors and Affiliations

  • V. I. Nemchenko
    • 1
  1. 1.Institute of Chemical PhysicsAcademy of Sciences of the SSSRMoscow

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