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
Fi igure 4.18:
No ormalized Reynolds
Str ress Component
@ z1 z L3=4D
Chapter 4
The vv v component t, behaving in the same mannner
as uu aat
z1, is confineed
and con ncentrated in the vortex coore
as an oval shaped regionn
aligned alonng
the y-ax xis (Figure 4.1 18). Further, tthe
deviation from the meaan
v values aare
minimu um in the reg gion outside thhe
forced vorttex
core and in
the near waall
region at a X/R =0.7 the e value is almoost
half the maximum
deviaation.
At z3 in n figure 4.19, the alignmentt
of oval shapped
region is ttilted
to a smaall
degree in anticlockw wise direction and the deviation
in v sppreads
to largger
radial positions p alon ng its axis. TThe
maximumm
deviations, along the ovval
shaped region, still ar re observed in the region cloosed
to vortex core.
69
Swirling Flow in a Pipe