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
Figu ure 3.16:
Seedin ng Setup (Pergole esi
F., 200 09).
A plastic
pipe (diam meter 40mm) iis
tied with tthe
internal pperiphery
of thhe
metal frame fr in a heli ical shape so aas
to cover thee
whole breaddth
of the mettal
frame and a consequen ntly the inlet surface. A lott
of small holees
are drilled in
the pipe
wall facing the inlet of thhe
experimenttal
setup and tthe
two ends of
the pipe e are connecte ed to the seedd
generator. Thhe
radial distaance
of the pippe
wall fro om the inlet surface s is suffficient
enoughh
not to affecct
the incominng
flow an nd provides a uniform u seedinng
across the iinlet
surface.
3.5.3
For each
Re, measure
along the t length of
piston surface s as refer
PIV sna apshots are tak
perform med using m
Dynam micStudio
pixels w
pixels a
® ements are coonducted
at diifferent
cross ssectional
plannes
the cylinder, , with their ddistances
meassured
from thhe
rence (Figure 3.4). At everyy
position and a given Re, 9994
ken. Data proocessing
and annalysis
of the PIV images aare
ulti-pass ‘Adaaptive
Correlation’
algoritthm
in Dantec
soft tware. The initial
interrogattion
window ssize
is 128 x 1228
with two refin nement steps tto
a final interrrogation
areaa
of size 32 x 332
nd 50% overla ap of the side oof
the interroggation
area.
3.6
Data Acq quisition aand
Process ssing
LDA Set tup
Chapter 3
LDA measurement m
has h been conduucted
using twwo
componennt
laser Doppller
anemom meter system (Figure 3.17). Laser beam ffrom
4W (maaximum
outpuut)
coheren nt Innova Ar-ion
laser is spliitted
in to greeen
( = 514.5 nm) and bluee
(
44
Experimental Setup