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 />
Fig gure 5.33:<br />
Mea an Normalized Axial A<br />
Vort ticity @ Re <strong>and</strong> a A<br />
75% % port closure.<br />
distribu ution, will al lso increase tthe<br />
vorticity distribution in the regioon<br />
between n vortex core <strong>and</strong> the nearr<br />
wall region.<br />
Thus eliminnating<br />
the verry<br />
weak vo ortical region to the side wwhere<br />
vortex core<br />
is closer tto<br />
the wall. Thhe<br />
mean axial a vorticity y distributionn<br />
at z in figgure<br />
5.32 is low <strong>and</strong> moore<br />
5<br />
uniform mly distributed d.<br />
When the t intake por rt is closed by 75% as shownn<br />
in figure 5.333,<br />
compared to<br />
other positions p <strong>of</strong> pis ston, at z thee<br />
strong vorticcity<br />
<strong>of</strong> the vorrtex<br />
core regioon<br />
1<br />
no lon nger exist. In nstead the voorticity<br />
distriibution<br />
is unniform<br />
with a<br />
compar ratively lower value. The voorticity<br />
distribuution<br />
is also uuniform<br />
<strong>and</strong> thhe<br />
plots ar re not shown due d to noise innclusion<br />
as meentioned<br />
earliier.<br />
In general it<br />
can be concluded c tha at with the inccrease<br />
in intakke<br />
port closuree<br />
the mean axiial<br />
velocity y distribution in the cylindder<br />
becomes mmore<br />
uniformm<br />
starting from<br />
downstream<br />
<strong>and</strong> mov ving to upstream<br />
cross-sectional<br />
positionss.<br />
5.2<br />
Cylinder r Wall Prressure<br />
MMeasureme<br />
ents<br />
Chapter 5<br />
For each<br />
piston posit<br />
the sam me manner as<br />
pressure e manometer<br />
Furness s<br />
limited<br />
HD755<br />
s<strong>of</strong>twar<br />
average<br />
®<br />
tion the static differential prressure<br />
has be<br />
s discussed inn<br />
section 4.4. Extech<br />
(resolution o<strong>of</strong><br />
1 Pa) is u<br />
digital diffe ferential microo<br />
manometer<br />
range. For a given positioon<br />
<strong>and</strong> Reyn<br />
, the measurem ments were coonducted<br />
for 5<br />
re with a acqu uisition frequeency<br />
<strong>of</strong> 1 read<br />
e value is obtained.<br />
Figuress<br />
5.34 & 5.35<br />
®<br />
een measured in<br />
HD7755<br />
differentiial<br />
used for the ccases<br />
where thhe<br />
r could not bbe<br />
used due to<br />
nolds number, , using Extechh<br />
5 minutes (using<br />
data loggin<br />
ding per seconnd)<br />
<strong>and</strong> then a<br />
give the normmalized<br />
pressu<br />
®<br />
ng<br />
an<br />
ure<br />
142<br />
Effect <strong>of</strong> Piston Position
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