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 F 4.27 7: Normalized N Reyn nolds Stress S Componen nt @ z1 L3=4D Chapter 4 v v r . Downstream D the t flow this ccovariance bettween v andd vr expands to larger radial r distance es with compaaratively smalller magnitude. It seems thhat the peak values, for all a given crosss sectional planne, are observved at the radiial distance e where the fo orced vortex haas its boundarries. Figure 4.27 4 show hig gh values of uw ´´ near cyylinder axis annd cylinder waall regions at z1 and the region in betwween has very low values. NNear the cylindder axis, wh here the vortex x core exists, hhigh values aree concentratedd in two regionns with opposite but same magnittude of covarriance betweeen u and w compon nents. 78 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 Fi igure 4.28: No ormalized Reyno olds Str ress Component @ z3 L3=4D Chapter 4 At z3 in figure 4.28 8, the maximum absolute values of u u´´ w decreasees, howeve er, in the near wall region itt grows radiallly inward towwards the vortex core an nd the concentrated uw ´´ rregion in the vortex core, spreads radiallly outward d. Further r downstream m at z5 in figuure 4.29, the overall magnnitude of u´ w ´ decrease es and is an order o of 10 smmaller than at z1. Comparinng contour ploots for ReA A and ReB in fi igure 4.28, u´ w ´ distributioon at ReA has small gradiennts in the flow f domain. In I other wordds, the flow at ReB is more reesistant towards a uniform spatial distribution of u u´´ w in the fllow domain. AAnother featuure 79 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 F 4.27 7:<br />
Normalized N Reyn nolds<br />
Stress S Componen nt<br />
@ z1 L3=4D<br />
Chapter 4<br />
v v r . Downstream D the t flow this ccovariance<br />
bettween<br />
v <strong>and</strong>d<br />
vr exp<strong>and</strong>s to<br />
larger radial r distance es with compaaratively<br />
smalller<br />
magnitude.<br />
It seems thhat<br />
the peak<br />
values, for all a given crosss<br />
sectional planne,<br />
are observved<br />
at the radiial<br />
distance e where the fo orced vortex haas<br />
its boundarries.<br />
Figure 4.27 4 show hig gh values <strong>of</strong> uw ´´ near cyylinder<br />
axis annd<br />
cylinder waall<br />
regions at z1 <strong>and</strong> the region in betwween<br />
has very low values. NNear<br />
the cylindder<br />
axis, wh here the vortex x core exists, hhigh<br />
values aree<br />
concentratedd<br />
in two regionns<br />
with opposite<br />
but same magnittude<br />
<strong>of</strong> covarriance<br />
betweeen<br />
u <strong>and</strong> w<br />
compon nents.<br />
78<br />
<strong>Swirling</strong> Flow in a Pipe
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