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 Fig gure 5.33: Mea an Normalized Axial A Vort ticity @ Re and a A 75% % port closure. distribu ution, will al lso increase tthe vorticity distribution in the regioon between n vortex core and the nearr wall region. Thus eliminnating the verry weak vo ortical region to the side wwhere vortex core is closer tto the wall. Thhe mean axial a vorticity y distributionn at z in figgure 5.32 is low and moore 5 uniform mly distributed d. When the t intake por rt is closed by 75% as shownn in figure 5.333, compared to other positions p of pis ston, at z thee strong vorticcity of the vorrtex core regioon 1 no lon nger exist. In nstead the voorticity distriibution is unniform with a compar ratively lower value. The voorticity distribuution is also uuniform and thhe plots ar re not shown due d to noise innclusion as meentioned earliier. In general it can be concluded c tha at with the inccrease in intakke port closuree the mean axiial velocity y distribution in the cylindder becomes mmore uniformm starting from downstream and mov ving to upstream cross-sectional positionss. 5.2 Cylinder r Wall Prressure MMeasureme ents Chapter 5 For each piston posit the sam me manner as pressure e manometer Furness s limited HD755 softwar average ® tion the static differential prressure has be s discussed inn section 4.4. Extech (resolution oof 1 Pa) is u digital diffe ferential microo manometer range. For a given positioon and Reyn , the measurem ments were coonducted for 5 re with a acqu uisition frequeency of 1 read e value is obtained. Figuress 5.34 & 5.35 ® een measured in HD7755 differentiial used for the ccases where thhe r could not bbe used due to nolds number, , using Extechh 5 minutes (using data loggin ding per seconnd) and then a give the normmalized pressu ® ng an ure 142 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 5.34: Avera age Static Pressur Drop along the Cylind @ Re e = 6.5 x 10 4 re der . Figu ure 5.35: Averag ge Static Pressure Drop along a the Cylind @ Re = 3.25 x 10 4 e der . Chapter 5 drop alo ong the measu uring cylinderr for different piston positioons/ intake poort opening g and Reynold ds numbers Ree and Re . A B It can be b observed th hat pressure ddrop profiles aalong the meaasuring cylindder exhibit nearly same shape s for diffeerent piston poositions providing fully opeen and pa artially closed intake portss. However, tthe significannt aspect is thhe variatio on in magnitud de of the normmalized pressuure drop at a ggiven measurinng position n. Although th he closure of iintake port is iincreased in a linear behavior i.e. 0%, 25%, 505 and d 75%, the connsequent cylinnder static walll pressure droop at a give en measuring position increeases in a nonn-linear behaviior. Figure 5.336 shows the normaliz zed wall stattic pressure drop at z and Re . Thhe 2 A measure ement data ha as been fitted using a powerr law functionn. This indicattes 143 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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