Experimental and Numerical Study of Swirling ... - Solid Mechanics
Experimental and Numerical Study of Swirling ... - Solid Mechanics
Experimental and Numerical Study of Swirling ... - Solid Mechanics
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Experi imental <strong>and</strong> <strong>Numerical</strong> N Stud dy <strong>of</strong> <strong>Swirling</strong> g Flow in Scaveenging<br />
Processs<br />
for 2-Stroke<br />
Marin ne Diesel Engin nes<br />
Chapter 4<br />
Swir S rling g Floow<br />
inn<br />
a PPipee<br />
Stereosco opic PIV meas surements <strong>of</strong> in in-cylinder conffined<br />
swirling flow have beeen<br />
carried out. o The measu urements are coonducted<br />
for three<br />
different cyylinder<br />
lengths in<br />
order to o characterize the effect <strong>of</strong> cylinder lengthh<br />
on the swirrling<br />
flow. LDDA<br />
measure ements have al lso been carrieed<br />
out at the iinlet<br />
section too<br />
study the floow<br />
pr<strong>of</strong>ile <strong>and</strong> a distribution n.<br />
The swi<br />
knowle<br />
parame<br />
roughn<br />
transfer<br />
scaveng<br />
characte<br />
confine<br />
test mo<br />
outlet s<br />
slide in<br />
aspect r<br />
become<br />
cylinde<br />
characte<br />
this ex<br />
(alignm<br />
room te<br />
two diff<br />
m 3 /s (a<br />
differen<br />
10 4 irling pipe flo ow experiment<br />
dge <strong>of</strong> author r, generally fo<br />
eters like Rey ynolds numb<br />
ess (Senoo et t al., 1972) a<br />
r application. Since the focu<br />
ging process in i large <strong>and</strong> l<br />
erization <strong>of</strong> th he effect <strong>of</strong> ch<br />
ed swirling flow w has been stu<br />
odel described d in Chapter<br />
section assemb bly, containin<br />
side the cylind der, measurem<br />
ratios i.e. cyli inder length<br />
es possible to o measure at<br />
r length is ch hanged. This<br />
eristics at a sp pecific positio<br />
periment the e internal dia<br />
ment <strong>of</strong> guide vanes in the<br />
emperature is s used as the f<br />
fferent flow rat tes with averag<br />
accuracy ± 2% %) measured<br />
ntial manomet ter. The corre<br />
± 18 870 <strong>and</strong> ReB =3 3.25 x 10<br />
from th he volumetric<br />
differen ntial manom<br />
experim mental results<br />
areas <strong>of</strong> f fundamental<br />
4 ts, conducted prior to curre<br />
ocus on studyiing<br />
the effects<br />
ber, swirl inteensity,<br />
swirl<br />
<strong>and</strong> vortex breeakdown<br />
on<br />
us in this studdy<br />
is on the sw<br />
low speed twwo<br />
stroke dies<br />
hange in cylindder<br />
length on<br />
udied. The expperiment<br />
is co<br />
3 using stereeo<br />
PIV techni<br />
ng outlet pipee<br />
fitted to cyli<br />
ments are condducted<br />
for 3 di<br />
equal to 8D, 6D <strong>and</strong> 4D.<br />
same measurring<br />
position<br />
helps in stuudying<br />
the va<br />
on while the ccylinder<br />
length<br />
ameter <strong>of</strong> the<br />
cylinder, d<br />
e swirl generaator)<br />
is kept c<br />
fluid <strong>and</strong> meaasurements<br />
ar<br />
ge values <strong>of</strong> QQA=0.149<br />
m<br />
d using an o<br />
esponding Rey<br />
± 9335)<br />
based on th<br />
flow rate meaasured<br />
using a<br />
eter. It is, however, wo<br />
can also be usseful<br />
for intere<br />
studies in turrbulent<br />
confin<br />
3 ent work, to thhe<br />
s <strong>of</strong> variation <strong>of</strong><br />
decay, relativve<br />
heat <strong>and</strong> maass<br />
wirling flow ffor<br />
sel engines, thhe<br />
n the in-cylindder<br />
onducted on thhe<br />
ique. Since thhe<br />
inder head, caan<br />
ifferent cylindder<br />
In this wayit<br />
even after thhe<br />
riation in floow<br />
h changes. Foor<br />
degree <strong>of</strong> swiirl<br />
constant. Air at<br />
re conducted at<br />
/s <strong>and</strong> QB= 0.07445<br />
orifice plate with a U-tubbe<br />
ynolds numbeers<br />
(ReA = 6.5 x<br />
he average vellocity<br />
calculateed<br />
an orifice platee<br />
with a U-tubbe<br />
orth mentionning<br />
that thhe<br />
ested readers wwithin<br />
different<br />
ned swirling floows.<br />
Table 4.1 4 provides th he detail for thhe<br />
axial positioon<br />
<strong>of</strong> differentt<br />
cross-sectionnal<br />
planes where measu urements are cconducted<br />
foor<br />
each cylindder<br />
length. Thhe<br />
axial di istance ‘z’ is measured m fromm<br />
cylinder boottom-dead-cennter<br />
(BDC) i. .e.<br />
piston surface s when the port is fuully<br />
open (Figgure<br />
3.4). It caan<br />
be seen that<br />
position n 1-6 are common<br />
in all thhe<br />
three cylindder<br />
lengths (8D,<br />
6D <strong>and</strong> 4DD)<br />
<strong>and</strong> for r cylinder len ngths 6D <strong>and</strong>d<br />
8D positionn<br />
1-9 are commmon.<br />
For thhis<br />
reason, in order to describe d the eeffect<br />
on variaation<br />
in cylindder<br />
length in a<br />
simple <strong>and</strong> clear way y, the pr<strong>of</strong>ile plots are divided<br />
in two parts<br />
for a giveen<br />
47<br />
<strong>Swirling</strong> Flow in a Pipe
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