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
Fig gure 4.34:
Norm malized Turbulen nt
Kine etic Energy @ z3
L3=4 4D
Chapter 4
With th he enlargemen nt of vortex coore
at z3, the mmaximum
vallue
of turbulent
kinetic energy decreases
(Figure 44.34).
The forrced
vortex reegion,
howeveer,
still has s largest value e of k . For ReeB,
the region surrounding the vortex coore
with minimum m value es of k , is obbserved
only in
a small regiion
of the crooss
sectiona al plane at z3.
Turbulent kkinetic
energyy
is very low along Y-axis at
radial position p Y/R= = ±0.35 from cylinder axis and along XX-axis,
turbulent
kinetic energy has co omparatively inncreased.
For both axes, thee
values of k at
large ra adial distance from f cylinder axis indicate an increase inn
the turbulence
level at t larger dista ance from thhe
cylinder wwall.
This demonstrates
thhe
existenc ce of asymmet tric distributioon
of k also ooutside
the forcced
vortex.
86
Swirling Flow in a Pipe