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

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Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines Chapter 4 the flow indicates a vortex breakdown. However, from the current experimental results, the location of the vortex breakdown being before or after the outlet contraction cannot be predicted. 106 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 Tab ble 5.1: Meas suring Positions. Effec E ct of f Pistton PPosiitionn In this chapter c the effe ect of piston poosition on the iin-cylinder swirrling flow durinng the scav venging process is studied usinng the stereoscoopic particle immage velocimettry techniqu ue. The measure rements are conducted at differrent cross-sectioonal planes alonng the cylin nder length and d at piston posit itions covering tthe air intake pport by 0%, 25% %, 50% and d 75%. In this experiment, st tereoscopic PIIV measuremeents are carrieed out using thhe same se etup as describ bed in Chapteer 3. The cylinnder length is kept at 4D annd measuring positions are also kept the same as ddescribed for L in Table 44.1 3 and also o given here in n Table 5.1. Positioon No. The le ength and diameter of e measure ements. The opening of th measure ements are co onducted at 4 cylinder inlet/ intake e port the cyli inder inlet. Th thus pa artially closin translat ted further by translat ted again by 1 compar red to its posit the wid dth of the cylin has red duced by 3cm 1 exhaust pipee is kept coonstant for aall he cylinder innlet has a widtth of 4 cm. Thhe 4 fixed pistonn positions. For fully opeen the pisston is kept alligned with thhe lower end of he piston is thhen translatedd inside the ccylinder by 1cm ng the inlet bby 25%. For 50% closuree the piston is 1cm. In the nnext step for 775% port closuure, the piston is 1cm with a tootal translationn of 3cm insiide the cylindder tion with fullyy open intake port. This meeans that at 755% nder inlet is reeduced to 1cmm and the cylinnder length also m compared tto 4D. Howeever, from thhe experimenttal 1 In th his chapter and other o parts of th he thesis the cylinder inlet is alsso named as inttake port analoggous to scavengge ports in a Two-Stroke low speed marine diesel engin ne. z1 z2 z3 z4 z5 z6 Axial Positions ( z/D ) 0.963 1.489 2.016 2.542 3.068 3.595 Chapter 5 107 Effect of Piston Position
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Manuscript J Mar Sci Technol manus
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00000000 11111111 piston screen con
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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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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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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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