Experimental and Numerical Study of Swirling ... - Solid Mechanics

Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging
Processs
for 2-Stroke
Marin ne Diesel Engin nes
Figure
4.6:
Averag ged 3D Velocity
Field at a z1 for L=4D
(Color Contour represen nt
the Normalized
out of
the pla ane velocity
compon nent Vz / Vb.
Chapter 4
If the size
of vortex core c is to be ddefined
as thee
radial distannce
from vortex
core to the high velocity
region theen
at z5 the sizze
of the vorteex
has increaseed
to almo ost half of the e cylinder radiius.
Moreoverr
it can also bbe
observed thhat
from ax xial location z1 z to z5 the floww
decays dowwnstream
and also position of
vortex core moves in clockwisee
direction foollowing
the in-plane swiirl
velocity y. For both Reynolds R nummbers
the size of vortex is nnow
nearly thhe
same an nd the asymm metry/ three-dimmensionality
of the velocityy
field seems to
have increased.
55
Swirling Flow in a Pipe