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 4.29: Normalized N Reyno olds St tress Component @ z5 L3=4D Chapter 4 that can n be observed for plots at z11, z3 and z5 is that near walll regions, at thhe two end ds of X-axis, ha as opposite siggns of uw ´´ . TThis shows that similar to thhe two reg gions near the cylinder axis, an opposite ccovariance alsoo exists betweeen u and w componen nts in the near r wall regions aat two sides off cylinder axis. . The con ntour plots for vw ´´ at z1 iin figure 4.30, , show similarr distribution as for u´ w ´ i.e. large va alues of vw ´´ exit in the neear wall regionn and two smaall regions near the cylin nder axis althoough with oppposite signs. The significannt differen nce is that th he orientatioon of the twwo regions is approximateely 80 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 4.30: No ormalized Reynol lds Str ress Component @ z1 z L3=4D Chapter 4 orthogo onal (in antic clockwise direection) to those in case of uw ´´ (Figuure 4.27). The T peak value es of vw ´´ aree also nearly thhe same as u´ w ´ . The v´ w ´ stress starts s spreading inn the other reggions however the peak valuues at z3 are e almost half the t values at zz1 (Figure 4.311). The spreadd of vw ´´ is not purely in i radial direc ction. From thhe contour ploots it can be seeen that the twwo small regions r with high h values oof vw ´´ near the cylinder axis enlarge in outward d radial direct tion as well ass in clockwise tangential dirrection whereeas the ne ear wall reg gion enlargess radially innward and ttangentially in 81 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 />
Fi igure 4.30:<br />
No ormalized Reynol lds<br />
Str ress Component<br />
@ z1 z L3=4D Chapter 4<br />
orthogo onal (in antic clockwise direection)<br />
to those<br />
in case <strong>of</strong> uw ´´ (Figuure<br />
4.27). The T peak value es <strong>of</strong> vw ´´ aree<br />
also nearly thhe<br />
same as u´ w ´ .<br />
The v´ w ´ stress starts s spreading inn<br />
the other reggions<br />
however the peak valuues<br />
at z3 are e almost half the t values at zz1<br />
(Figure 4.311).<br />
The spreadd<br />
<strong>of</strong> vw ´´ is not<br />
purely in i radial direc ction. From thhe<br />
contour ploots<br />
it can be seeen<br />
that the twwo<br />
small regions r with high h values o<strong>of</strong><br />
vw ´´ near the cylinder axis enlarge in<br />
outward d radial direct tion as well ass<br />
in clockwise tangential dirrection<br />
whereeas<br />
the ne ear wall reg gion enlargess<br />
radially innward<br />
<strong>and</strong> ttangentially<br />
in<br />
81<br />
<strong>Swirling</strong> Flow in a Pipe
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