Experimental and Numerical Study of Swirling ... - Solid Mechanics

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Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Figure F 4.21: Normalized N Reyno olds St tress Component @ z1 L3=4 4D Chapter 4 distribu uted compared d to vv . Thhe anti-clockwwise tilt observved in the shappe of oval region may po ossibly be becaause of the helical structure of vortex alonng the cylinder length. The ww componen nt at z1 is showwn in figure 44.21. The vorttex core exhibiits a non-axis symmetric distributiion of ww that indicates the three dimensionality of th he flow and itts consequentt effect on w variance. Thhe effect of vortex core precession p is ssignificant butt the half circlle arc-like shappe of the region with high h variancee seems to inndicate the voortex precessioon superim mposed on the e three dimensional velocityy variations. TThe region with 72 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 F 4.22: Normalized N Reyn nolds Stress S Component @ z3 L3= =4D Chapter 4 minimu um variance or in other wwords comparratively steadyy axial velociity distribu ution is betwe een the core aand the wall region where high values of axial ve elocity are obs served (Figuree 4.10). ww is also large in the near waall region. The relatively y smaller size oof large w vaariance region at ReB is due to smaller vortex core co ompared to onne at ReA. The largest w varian nce at z3 is neearly half the vvalue at z1 (Fiigure 4.22). Thhe forced vortex v region has large ww value except vortex cennter where it is low. Ne ear wall region n also demonsstrate large axxial w ´ disturbbances with thhe swirl de ecaying downs stream the floww. 73 Swirling Flow in a Pipe
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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