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 Fig gure 4.34: Norm malized Turbulen nt Kine etic Energy @ z3 L3=4 4D Chapter 4 With th he enlargemen nt of vortex coore at z3, the mmaximum vallue of turbulent kinetic energy decreases (Figure 44.34). The forrced vortex reegion, howeveer, still has s largest value e of k . For ReeB, the region surrounding the vortex coore with minimum m value es of k , is obbserved only in a small regiion of the crooss sectiona al plane at z3. Turbulent kkinetic energyy is very low along Y-axis at radial position p Y/R= = ±0.35 from cylinder axis and along XX-axis, turbulent kinetic energy has co omparatively inncreased. For both axes, thee values of k at large ra adial distance from f cylinder axis indicate an increase inn the turbulence level at t larger dista ance from thhe cylinder wwall. This demonstrates thhe existenc ce of asymmet tric distributioon of k also ooutside the forcced vortex. 86 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 Fig gure 4.35: Nor rmalized Turbule ent Kin netic Energy @ z5 L3= =4D At z5, k has decrease ed in the nearr wall region aand large valuues are observeed only in the vortex co ore region (Figgure 4.35). Thhe vortex core at ReB containns more tu urbulent kinet tic energy thann at ReA. 4.3 Effect of f Cylindeer Length Chapter 4 In the previous p section 4.2 the PIIV results for L3=4D are annalyzed and thhe effect of o Reynolds nu umber at seleccted measurinng positions aare discussed. In this section the PIV experimental e rresults are stuudied to underrstand the effeect 87 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 />
Fig gure 4.35:<br />
Nor rmalized Turbule ent<br />
Kin netic Energy @ z5<br />
L3= =4D<br />
At z5, k has decrease ed in the nearr<br />
wall region a<strong>and</strong><br />
large valuues<br />
are observeed<br />
only in the vortex co ore region (Figgure<br />
4.35). Thhe<br />
vortex core at ReB containns<br />
more tu urbulent kinet tic energy thann<br />
at ReA.<br />
4.3<br />
Effect <strong>of</strong> f Cylindeer<br />
Length<br />
Chapter 4<br />
In the previous p section<br />
4.2 the PIIV<br />
results for L3=4D are annalyzed<br />
<strong>and</strong> thhe<br />
effect <strong>of</strong> o Reynolds nu umber at seleccted<br />
measurinng<br />
positions aare<br />
discussed. In<br />
this section<br />
the PIV experimental e<br />
rresults<br />
are stuudied<br />
to underrst<strong>and</strong><br />
the effeect<br />
87<br />
<strong>Swirling</strong> Flow in a Pipe
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