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 5.14: Averag ged 3D Velocity Field at a z 50% port 5 closure e (Color Contour r represe ent the Normaliz zed out of f the plane velocity ty compo onent Vz / V . b Figu ure 5.15: Averag ged 3D Velocity Field at a z 75% port 1 closure e (Color Contour r represe ent the Normaliz zed out of f the plane velocit ty compo onent Vz / V . b observe ed at extreme e radial positiions of the ddiagonal line. . However, thhe differen nce between th he values of mmaximum and minimum V Vz is very smaall. The in-plane velocity y vectors indiccate an increaase with radiaal distance from the cylinder axis. 75% Por rt Closure Chapter 5 The vel locity field at z has also axxial velocity diistribution conncentrated neear 1 the cylinder axis i.e. jet like profile (Figure 5.15) . The profile hhas a sharp peaak compar red to V at z and 50% cllosed port in figure 5.13. BBesides the axiial z 1 velocity y peak does no ot coincide witth the vortex ccore but it is less pronounceed than V at z and 50 0% closed portt. z 1 Here in n this case, ins stead of z thee results are ggiven for z annd z in order to 5 2 3 present and discuss an n important fe feature of the fflow. 120 Effect of Piston Position
Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Figu ure 5.16: Averag ged 3D Velocity Field at a z 75% port 2 closure e (Color Contour r represe ent the Normaliz zed out of f the plane velocit ty compo onent Vz / V . b Figu ure 5.17: Averag ged 3D Velocity Field at a z 75% port 3 closure e (Color Contour r represe ent the Normaliz zed out of f the plane velocit ty compo onent Vz / V . b Chapter 5 The in-plane velocity y profile repreesents an incrrease in magnnitude with thhe increase e in radial dis stance from thhe vortex corre indicating a forced vorteex. Howeve er, a very dist tinct feature tthat is observved is that thee vortex core is behavin ng like a sour rce i.e. the fluuid moves ouutward from the vortex coore followin ng a curved path. p This indiicates that fluid is undergoing an outwarrd movem ment with vorte ex core being the source point. This patteern continues to z wher re due to vor rtex breakdowwn between ppositions z aand z the axiial 2 1 2 velocity y has a wake like profile i. .e. low velocitty at the vorttex core (Figuure 5.16). However, H when flow reachees position z , this pattern cchanges and thhe 3 in-plane e velocity distr ribution has nnow a regular swirling flow pattern (Figuure 5.17). It t must be not ted that throuughout the floow from position z to z , thhe 1 3 tangent tial velocity ha as same profilee i.e. solid boddy rotation (Foorced vortex). A possible e reason for this behavior iis that at highh Reynolds number for 755% port clo osure, the cyli inder inlet proovides a very small area foor fluid to entter into cyl linder resultin ng in a high vvelocity jet of f the fluid at tthe intake porrt. This jet t, from every direction d may meet at some axial distance and then movve 121 Effect of Piston Position
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Manuscript J Mar Sci Technol manus
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50 % and 75 % partially closed inta
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DTU Mechanical Engineering Section
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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