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 />
Figure<br />
4.44:<br />
Mean n Vortex Core<br />
positi ions for L3=4D.<br />
Chapter 4<br />
For all cylinder leng gths L1, L2 <strong>and</strong>d<br />
L3 the meann<br />
position <strong>of</strong> the vortex coore<br />
moves in a clockwis se direction frrom<br />
z1 near tthe<br />
cylinder inlet<br />
to the laast<br />
position n. This demon nstrates that thhe<br />
vortex core has a helical ppath<br />
that rotattes<br />
in the same s direction n as the swirl direction (Figgures<br />
4.6-4.8). . The radius <strong>of</strong><br />
the heli ical path is sm mall <strong>and</strong> lies wwith<br />
X/R= 0.1. . For a given ccylinder<br />
lengtth,<br />
the radi ius <strong>of</strong> the heli ical path is noot<br />
the same foor<br />
all the meassuring<br />
positionns<br />
<strong>and</strong> the e vortex core location<br />
does nnot<br />
coincide aat<br />
all measurinng<br />
positions ffor<br />
both th he Reynolds nu umbers. At z1, , the helical ppath<br />
has a smaall<br />
radius whicch<br />
increase es at downstr ream positionns.<br />
Only for few consecuutive<br />
measurinng<br />
position ns, the helix radius r is samee.<br />
For L3 <strong>and</strong>d<br />
L2 in figuress<br />
4.44 <strong>and</strong> 4.445<br />
respecti ively, the helic cal vortex coree<br />
path does noot<br />
complete onne<br />
revolution.<br />
96<br />
<strong>Swirling</strong> Flow in a Pipe
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