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 Figur re 6.13: Compa arison of Normalized Axial Velocity y Profile at z . 5 Fig gure 6.14: Com mparison of Nor rmalized Axial Velo ocity Profile at z6 6 . Chapter 6 At z in n figure 6.10, RNG k wwith T.I 1% aand RSM still show a reverrse 2 flow in the vortex co ore region andd RNG k with T.I 10% % does not shoow any reverse flow. How wever, the vorrtex core size iis still over preedicted and also the pea ak axial veloci ity magnitudee is comparatiively less thann the measureed value at t that cross-sec ctional position. At z , al ll the simulati ion cases showw a positive axxial velocity in the vortex coore 3 region (Figure ( 6.11). However, thee vortex core siize is still overr predicted with RSM predicting the smallest and RNG k with T.I 1% the largest sizze. The ma aximum axial velocity v is stilll under prediccted. At furth her downstrea am positions fr from z and z in figures 6.122-6.14) the axiial 4 6 velocity y predicted by RSM has ssimilar profilee shape but with a smalller overall magnitude. RNG R k mmodel show faaster mass entrrainment in thhe 156 Numerical Modeling
Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Figure e 6.15: Snapshot t of Velocity Magnitu ude (a) RNG k Model M T.I 1% (b) RNG k Model T.I 10% (c) RSM R T.I 10%. velocity y deficit regio on near the cyylinder axis coompared to RRSM. At z , thhe 6 RNG k model with T.I 10% % case prediccts a jet-like velocity profiile whereas s the T.1 1% case gives a fullly developed aaxial velocity pprofile. 6.2.3 Velocity Magnitudde The con ntour plots fo or the velocityy magnitude iis shown in ffigure 6.15. Thhe plots do oes not show the data averraged over all the time stepps but is insteaad just an instantaneous numerical ssnapshot of thhe flow predicction by all thhe aforeme entioned simu ulation cases affter 0.05s floww time. (a) (b) (c) From fi igure 6.15 for all the simulaation cases, it ccan be seen thhat there existss a large flo ow separation n at the wall wwhen the floww enters the ccylinder. This is obvious sly due to th he 90 bendd that exists between the outlet of thhe converg gent section and a the flow ccylinder. This wall flow sepparation regioon exists ap pproximately between b one tto two diametter lengths along the cylindeer. X Y Z Chapter 6 157 Numerical Modeling
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