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 Figu ure 6.8: Comp parison of Norm malized Tangentia al Veloci ity Profile at z . 6 Figu ure 6.9: Comp parison of Norm malized Axial Veloc city Profile at z . 1 6.2.2 Axial Ve elocity Chapter 6 For nor rmalized axial l velocity proffiles, at z , all the simulatioon cases resultt a 1 wake-lik ke profile but with a recirrculation zonne in the vorttex core regioon (Figure 6.9). This see ems to be a mmajor differencce between thhe experimenttal and num merical results s because the experimental data, at z doees not show anny 1 recircul lation. Since no n measuremeents have beenn carried out at cross sectionnal position ns before z , it t is however unnknown whetther or not in the experiment 1 setup th here exists an ny recirculation prior to z . The vortex ccore size is also 1 predicte ed to be larg ger than the experimentaal data. This shows a pooor agreement with the experimentall data. RNG k modell with T.I 100% predicts s a comparativ vely lower peaak axial velociity magnitudee than the othher simulat tion cases. All the modells show reasoonable agreemment with thhe experim mental axial ve elocity profile in the region close to the wwall i.e X/R =00.6 to 0.8. 154 Numerical Modeling
Experi imental and Numerical N Stud dy of Swirling Flow in Scaveenging Processs for 2-Stroke Chapter 6 Marin ne Diesel Engin nes Figu ure 6.10: Comp parison of Norm malized Axial Veloc city Profile at z . 2 Fig gure 6.11: Com mparison of Norm malized Axial Velo ocity Profile at z . 3 Figur re 6.12: Compa arison of Normalized Axial Velocity y Profile at z . 4 155 Numerical Modeling
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DTU Mechanical Engineering Section
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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