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 Tab ble 3.1: Optic cal Details of LD DA System m . Figure 3.18: Overview of LDA measurem ment positions (Schnippe er, 2010). Pro operty Wave elength Focal Length Beam Diameter D Beamm 1 BBeam 2 514.5 nnm 488 nm 310 mmm 3110 mm 1.35 mmm 1.335 mm Chapter 3 46 Experimental Setup
Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging Processs for 2-Stroke Marin ne Diesel Engin nes Chapter 4 Swir S rling g Floow inn a PPipee Stereosco opic PIV meas surements of in in-cylinder conffined swirling flow have beeen carried out. o The measu urements are coonducted for three different cyylinder lengths in order to o characterize the effect of cylinder lengthh on the swirrling flow. LDDA measure ements have al lso been carrieed out at the iinlet section too study the floow profile and a distribution n. The swi knowle parame roughn transfer scaveng characte confine test mo outlet s slide in aspect r become cylinde characte this ex (alignm room te two diff m 3 /s (a differen 10 4 irling pipe flo ow experiment dge of author r, generally fo eters like Rey ynolds numb ess (Senoo et t al., 1972) a r application. Since the focu ging process in i large and l erization of th he effect of ch ed swirling flow w has been stu odel described d in Chapter section assemb bly, containin side the cylind der, measurem ratios i.e. cyli inder length es possible to o measure at r length is ch hanged. This eristics at a sp pecific positio periment the e internal dia ment of guide vanes in the emperature is s used as the f fferent flow rat tes with averag accuracy ± 2% %) measured ntial manomet ter. The corre ± 18 870 and ReB =3 3.25 x 10 from th he volumetric differen ntial manom experim mental results areas of f fundamental 4 ts, conducted prior to curre ocus on studyiing the effects ber, swirl inteensity, swirl and vortex breeakdown on us in this studdy is on the sw low speed twwo stroke dies hange in cylindder length on udied. The expperiment is co 3 using stereeo PIV techni ng outlet pipee fitted to cyli ments are condducted for 3 di equal to 8D, 6D and 4D. same measurring position helps in stuudying the va on while the ccylinder length ameter of the cylinder, d e swirl generaator) is kept c fluid and meaasurements ar ge values of QQA=0.149 m d using an o esponding Rey ± 9335) based on th flow rate meaasured using a eter. It is, however, wo can also be usseful for intere studies in turrbulent confin 3 ent work, to thhe s of variation of decay, relativve heat and maass wirling flow ffor sel engines, thhe n the in-cylindder onducted on thhe ique. Since thhe inder head, caan ifferent cylindder In this wayit even after thhe riation in floow h changes. Foor degree of swiirl constant. Air at re conducted at /s and QB= 0.07445 orifice plate with a U-tubbe ynolds numbeers (ReA = 6.5 x he average vellocity calculateed an orifice platee with a U-tubbe orth mentionning that thhe ested readers wwithin different ned swirling floows. Table 4.1 4 provides th he detail for thhe axial positioon of differentt cross-sectionnal planes where measu urements are cconducted foor each cylindder length. Thhe axial di istance ‘z’ is measured m fromm cylinder boottom-dead-cennter (BDC) i. .e. piston surface s when the port is fuully open (Figgure 3.4). It caan be seen that position n 1-6 are common in all thhe three cylindder lengths (8D, 6D and 4DD) and for r cylinder len ngths 6D andd 8D positionn 1-9 are commmon. For thhis reason, in order to describe d the eeffect on variaation in cylindder length in a simple and clear way y, the profile plots are divided in two parts for a giveen 47 Swirling Flow in a Pipe
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DTU Mechanical Engineering Section
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