<DOC>
<DOCNO>
1371
</DOCNO>
<TITLE>
axisymmetric free mixing with swirl .
</TITLE>
<AUTHOR>
steiger,m.h. and bloom,m.h.
</AUTHOR>
<BIBLIO>
pibal r.628.
</BIBLIO>
<TEXT>
  viscous laminar axially-symmetric
free-mixing with small, moderate,
and large swirl is investigated by a
boundary layer type of analysis with
integral methods .  moderate and small
swirls are formally the same, differing
only in the order of their associated
radial pressure gradients .  neither
induces significant axial pressure gradients,.
consequently their effect on the
axial flow is negligible .  for moderate and
small swirl an interesting feature
is the swirl decay .  in both compressible
and incompressible flow, it is
shown that jet swirl decays more rapidly
than wake swirl whereas both swirls
decay more rapidly than the non-uniformity
in axial velocity .  large swirl
generates axial pressure gradients as well
as large radial pressure gradients,
and therefore alters the streamwise flow .
examples calculated for incompressible
flow, show that the wake is
lengthened by large swirl .  it is expected
that this effect will be diminished
in the presence of higher free-stream
mach numbers which lead to decreased
densities, due to decreased centrifugal
effects, decreased radial pressure
gradients, and decreased axial pressure
gradients .
</TEXT>
</DOC>
