Experimental and Numerical Study of Swirling ... - Solid Mechanics
Experimental and Numerical Study of Swirling ... - Solid Mechanics 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 Figure 4.44: Mean n Vortex Core positi ions for L3=4D. Chapter 4 For all cylinder leng gths L1, L2 andd L3 the meann position of the vortex coore moves in a clockwis se direction frrom z1 near tthe cylinder inlet to the laast position n. This demon nstrates that thhe vortex core has a helical ppath that rotattes in the same s direction n as the swirl direction (Figgures 4.6-4.8). . The radius of the heli ical path is sm mall and lies wwith X/R= 0.1. . For a given ccylinder lengtth, the radi ius of the heli ical path is noot the same foor all the meassuring positionns and the e vortex core location does nnot coincide aat all measurinng positions ffor both th he Reynolds nu umbers. At z1, , the helical ppath has a smaall radius whicch increase es at downstr ream positionns. Only for few consecuutive measurinng position ns, the helix radius r is samee. For L3 andd L2 in figuress 4.44 and 4.445 respecti ively, the helic cal vortex coree path does noot complete onne revolution. 96 Swirling Flow in a Pipe
Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Figure 4.45: Mean n Vortex Core positi ions for L2=6D. Figure F 4.46: : Mean M Vortex Core e po ositions for L1=8D D. Chapter 4 For L1, an interesting g feature is obbserved wheree the helical vortex path dooes not com mplete one rev volution and iinstead seems to re-twists att one side of thhe X-axis. This re-twist behavior in thhe helical patth is observedd from z10-z13. A complete re-twist in the helical voortex path maay be possiblee to observe ffor cylinder lengths more e than 8D. 97 Swirling Flow in a Pipe
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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 />
4.45:<br />
Mean n Vortex Core<br />
positi ions for L2=6D.<br />
Figure F 4.46: :<br />
Mean M Vortex Core e<br />
po ositions for L1=8D D.<br />
Chapter 4<br />
For L1, an interesting g feature is obbserved<br />
wheree<br />
the helical vortex<br />
path dooes<br />
not com mplete one rev volution <strong>and</strong> iinstead<br />
seems to re-twists att<br />
one side <strong>of</strong> thhe<br />
X-axis. This re-twist behavior in thhe<br />
helical patth<br />
is observedd<br />
from z10-z13. A<br />
complete<br />
re-twist in the helical voortex<br />
path maay<br />
be possiblee<br />
to observe ffor<br />
cylinder<br />
lengths more e than 8D.<br />
97<br />
<strong>Swirling</strong> Flow in a Pipe
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