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 Figure F 4.36: : Normalized N Tang gential Velocity V Profiles for fo L=4D, L 6D, 8D (z1 1 --- z6). of varia ation in cylind der length forr each Reynoldds number. TThe profile ploots for diff ferent flow ch haracteristics aare presented separately forr each Reynoldds number r and as desc cribed in tabble 4.1, first a comparisonn of results ffor cylinder lengths of 4D D, 6D and 8DD are discussedd i.e. measurinng planes (z1-zz6) and the en the results for f z7-z13 are giiven for the cyylinder lengthss of 6D and 8DD. The con ntour plots for 3D velocity field, axial voorticity, Reynoolds stresses annd turbulent kinetic ene ergy are discussed only for selected meassuring positionns and rem maining results are given in Appendix C. 4.3.1 Tangentia al Velocityy Profile Chapter 4 88 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 Fig gure 4.37: Nor rmalized Tangential Velo ocity Profiles for L=6 6D, 8D (z7 --- z13). The no ormalized tang gential velocitty profiles at mmeasuring poositions z1-z6 aare shown in figure 4.35 for cylinder llengths of 4D, , 6D and 8D. Xv indicates X- axis afte er the origin of o the coordinnate system iss shifted to thee approximateed mean vortex center. It I can be seen that despite thhe change in ccylinder lengtth, there is s almost no variation in the V profille at z1-z5. OOnly very smaall variatio ons are observe ed near the peeak V values. At z6, the V profile for LL3 has slightly higher pe eak value at neegative Xv /R ppositions commpared to L2 annd L3. The e reason is that the positioon z6 is locateed very close to the cylindder outlet and a flow at that t position feels the effecct of being aaccelerated with increase e in axial str rain due to smaller diammeter of cylinnder outlet ii.e d D 0.58 . i i Chapter 4 89 Swirling Flow in a Pipe
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DTU Mechanical Engineering Section
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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