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 F 4.21:
Normalized N Reyno olds
St tress Component
@ z1 L3=4 4D
Chapter 4
distribu uted compared d to vv . Thhe
anti-clockwwise
tilt observved
in the shappe
of oval region may po ossibly be becaause
of the helical
structure of vortex alonng
the cylinder
length.
The ww
componen nt at z1 is showwn
in figure 44.21.
The vorttex
core exhibiits
a non-axis
symmetric
distributiion
of ww
that indicates
the three
dimensionality
of th he flow and itts
consequentt
effect on w variance. Thhe
effect of
vortex core precession p is ssignificant
butt
the half circlle
arc-like shappe
of the region with high h variancee
seems to inndicate
the voortex
precessioon
superim mposed on the e three dimensional
velocityy
variations. TThe
region with
72
Swirling Flow in a Pipe