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 3.2: Inlet Section S design (modif fication of origina al figure by Andersen et al., a 2008). 3.1.1 A transparent acrylic c cylinder (prooduced using casting proceess to give goood optical properties) is used. The tottal length of tthe cylinder is (L=1945 mmm) with in nternal diamet ter (D= 190 mmm) and exterrnal diameter (Do=200 mmm). One end of the cylinder is fitted innside the inlett section and aat the other ennd an outle et section is fit tted. 3.1.2 Cylinder Inlet Sect tion (Swirll Generatorr) The inlet section co onsists of twwo transparennt ring-shapedd acrylic plattes (Do=60 00 mm) (Figur re 3.2). The pllates are fittedd in parallel bby mounting 660 guide vanes v in betwe een them thuss serving as wwalls boundingg the flow. Thhe distance e between the internal wallss of the plates/ / height of inddividual blade is 100 mm m. A screen with 51% oppen area ratioo is glued aroound the outter periphe ery of the inlet t section as shoown in figure 1. A contractiion section with larger end e at 100mm m and smaller r end 40 mm is mounted innternally at thhe inner periphery p of th he inlet sectioon (profile givven in Appenndix D) (Figuure 3.2). Pos sition of pressure tap Chapter 3 An overview of indiv vidual guide vane construcction is shownn in figure 3. .3. Each gu uide vane has s a thickness of 1 mm andd a width of 226.16 mm. Thhe guide vanes v are then n adjusted in a way that oone end is alligned in radiial directio on with the in nlet. The floww enters the guuide vane in radial directioon and div verts at an ang gle of 35°. Thee guide vanes are mounted at a large radiial distance e from the ge eometric centter of the cylinder and cloose to the inllet (Figure 3.2). This wi ill give some time to the fflow after thee vanes to setttle thereby y minimizing the wake efffects. Furtherr, before enteering in to thhe 32 Experimental Setup
Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Fig gure 3.3: Guid ide Vane design. cylinder, the flow en nters a bell-moouth shape coontraction secttion which will accelera ate the flow an nd reduce thee velocity flucttuations. The acrylic cylindder is enter red in to the e inlet sectionn from one sside and fromm other side, a transparent piston is mounted. Thhe piston can slide inside thhe cylinder thus partially y/ fully closing the cylinderr inlet section, , similar in a wway that in reeal engine the reciproca ating piston uuncovers and covers the sccavenging porrts during the scavenging process. Howwever, currentt work is focused on studyinng the in-c cylinder swirling flow whenn the piston iss at the BDC ( (the inlet to thhe cylinder is fully open n) and piston ppositions wherre it covers thee intake port bby 25%, 50 0% and 75%., depending onn the two expeeriments descriibed in Chaptter 4 and 5. 3.1.3 Outlet Se ection Chapter 3 The out tlet section co onsists of a smmaller internal diameter pippe (De=110 mmm) and len ngth (Le=1415 5mm). Large length of thhe pipe will minimize anny possible e effect on the e nature of thhe swirling floow inside the cylinder due to bending g in connectin ng pipes to oriifice plate andd fan. The shaape of the outllet provide es a flat-botto om head to thhe cylinder. TThe outlet seection can slidde inside the cylinder and facilitatees to conducct experimentts at a desireed effective e length of the e cylinder whiich in this studdy is kept at 4DD, 6D and 8DD. 33 Experimental Setup
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Manuscript J Mar Sci Technol manus
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50 % and 75 % partially closed inta
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V θ / V b V θ / V b V θ / V b 1.
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DTU Mechanical Engineering Section
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