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 Fi igure 4.38: No ormalized Axial Vel locity Profiles for r L=4 4D, 6D, 8D (z1 -- z6). For L2a and L3 the tangential velocitty decays in allmost the samme manner as L3 except at a z6. Figure 4.37 4 shows thhe V profiless for the remaaining positionns i.e. z7-z9 9 for L2 and z7 7-z13 for L1. Thhe swirl decay results in the decrease in thhe V valu ues downstrea am to z6 and iincrease in thee size of the vvortex. For botth Reynold ds number the t peak V value moves to larger rradial distancces downstream and at z1 11 for L1, it seemms that the prrofile shape haas changed from Rankine/burger vort tex to nearly solid body rotational forrced vortex. In general, it can be concluded that V graduallyy decays downnstream and thhe vortex enlarges in size with a grradual transittion from Raankine/ Burgeers vortex to t forced vorte ex profile. 4.3.2 Axial Vel locity Profi file Chapter 4 90 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 Fi igure 4.39: No ormalized Axial Vel locity Profiles for r L= 6D, 8D (z7 --- z13) ). Chapter 4 The nor rmalized axial l velocity profi files at positionns z1-z6 for cyliinder lengths of 4D, 6D and 8D are sh hown in figurre 4.38. The prrofiles are nearrly the same fo for a given position excep pt at z6 for cyllinder length 44D where due to the presence of cylin nder outlet an n increase in the axial veloocity is observved. Very smaall variatio ons in magnitu ude of axial velocity are obseerved in the annnular region. . At ReA and z7-z9, the Vz values in the vortex core are lower ffor L3 compareed to L2. Considering C th he Y-axis scalee this differencce however is very small. Foor ReB no such differen nce is observeed. With the decay in the swirl the axiial velocity y distribution for L2 and L3 gradually changes fromm a ‘wake-likke’ 91 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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