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 4.42: Maximum Swirl Parameter (absolute value es) for L=8D, 6D D and 4D. 4 Ta able 4.3: Val lues of Polynomia al Coe efficient for data fitti ing the Maximum m Swi irl Parameter Va alue. outlet. Similarly for L1 from z10-z133 a small increase in S i max which may m be an ind dication of cyylinder outlet effect. The ov S at t different axial positions is fitted usingg a 7 max (Table 4.3). 4 However r, it must be reemembered th measure ements are not conductedd for the who discusse ed before at fu urther downsttream position to be at t larger radial distance fromm cylinder axi measure ed in the near wall regioon. Therefore, slightly be different for z9-z13. AAn integrated cylinder diameter wi ill give the avverage value o position n. th is also observeed verall profile of degree polynomial ffit hat in the curreent experimennt, ole cylinder ddiameter and as ns maximum V is observeed is and V valuues are also not z the actual S value may max value of S for the whoole of swirl at a ggiven measurinng Polyno omial Coefficients Vallues a0 0.5267703922 a1 2.8669913238 a2 -3.3799260164 a3 1.5900002361 a4 -0.3916679792 a5 0.0534433717 a6 -0.003825368 0.0000112153 a7 Chapter 4 94 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 Figu ure 4.43: Mean Normalized Axi ial Vortic city profiles for fo L1=8D D @ ReA and ReB. 4.3.5 The me ean axial vortic city profiles foor L1 are showwn in figure 4.443 for both ReA and ReB B. Since there is no significcant differencee between profiles at z1-z9 z for L2 and L1, only th he results for LL1 are presentedd here. The vor rticity has a Gaussian like profile at z1 witth its peak higgher at ReB thaan ReA. Th his higher vo ortical behaviior of flow aat low Reynoolds number is observe ed until z6 whe ere the differeence in in the vortex corre region is veery z small fo or the two Re eynolds numbbers. As the sswirl decays ddownstream thhe profile peak also dec creases and teends to becomme gradually more uniforrm along the t cylinder cross-section. For measuring positionss z11-z13 the z profiles s become like a straight line and can be coonsidered as uniform. 4.3.6 Mean Axial Vorticiity Mean Vor rtex Core PPosition Chapter 4 The me ean vortex cor re location at ddifferent meassurement posiitions along thhe cylinder length are given g in figurees 4.44-4.46. FFigures show the vortex coore location n for both Rey ynolds numbeers at a given cyylinder lengthh ReA and ReB. 95 Swirling Flow in a Pipe
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Manuscript J Mar Sci Technol manus
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DTU Mechanical Engineering Section
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