Abstract
The structure and evolution of cavitation and its influence on jet patterns from two transparent cross-flow nozzles with holes inclined at 90 degrees (nozzle A) and 80 degrees (nozzle B) to the nozzle axis have been investigated using high-speed motion pictures, flash photography and stroboscopic visualization. At the onset, cavitation inception was in the form of travelling bubbles, which were transported along the flow and clearly detached from the wall. As the flow was increased the bubbles grew and merged into a dense group of bubbles (cloud cavitation), partly unsteady and shedding. Further increasing the flow caused the cavitation at the entrance to transform mainly into a glassy appearance and at this stage the cavitation was well inside the hole and the spray appeared symmetric. When the flow was increased beyond this stage, cavitation extended to the exit of the hole, occupying a significant part of the hole on one side, resulting in a jet that atomized on the side where cavitation was most extensive and a non-atomizing jet on the side with less cavitation. The distribution of cavitation in the hole is very sensitive to the nozzle geometry and it substantially influences the spray dispersion.
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References
Bergwerk W (1959) Flow pattern in diesel nozzle spray holes. Proc Inst Mech Eng 173:25, 655–660
Ganippa LC, Bark G, Andersson S, Chomiak J (2001a) The structure of cavitation and its effect on the spray pattern in a single-hole diesel nozzle. SAE paper 2001-01-2008
Ganippa LC, Bark G, Andersson S, Chomiak J (2001b) Comparison of cavitation phenomena in diesel nozzles. In: International Symposium on Cavitation, California, 2001
Hiroyasu H (2000) Spray break-up mechanisms from the hole-type nozzle and its applications. Atom Sprays 10:511–527
Hiroyasu H, Arai M, Shimizu M (1991) Break-up length of a liquid jet and internal flow in a nozzle. ICLASS-91, Gaithersburg, MD, pp 275–282
Kato M, Kano H, Date K, Oya T, Niizuma K (1997) Flow analysis in nozzle hole in consideration of cavitation. SAE Paper 970052
Kent JC, Brown GM (1983) Nozzle exit flow characteristics for square-edged and rounded inlet geometries. Combust Sci Technol 30:121–132
Nagasaka K, Takagi T, Koyanagi K, Yamauchi T (2000) The development of fine atomization injector. JSAE Rev 21:309–313
O’Hern TJ (1991) An experimental investigation of turbulent shear flow cavitation. J Fluid Mech 215:365–391
Reitz RD, Bracco FV (1982) Mechanism of atomization of a liquid jet. Phys Fluids 25:1730–1742
Soteriou C, Andrews R, Smith M (1995) Direct injection diesel sprays and the effect of cavitation and hydraulic flip on atomization. SAE Paper 950080
Tamaki T, Shimizu M, Nishida K, Hiroyasu H (1998) Effect of cavitating and internal flow on atomization of a liquid jet. Atom Sprays 8:179–197
Taneda S (2000) Instability waves in the shear layer over a separation bubble. J Fluid Dyn Res 27:335–351
von Berg E, Edelbauer W, Tatschl R, Volmajer M, Kegl B, Alajbegovic A, Ganippa LC (2003) Validation of a CFD model for coupled simulation of nozzle flow, primary fuel jet break-up and spray formation. In: Proceedings of ASME Internal Combustion Engine Conference, ICES2003-643, 11–14 May, Salzburg. ASME, New York
von Berg E, Grief D, Tatschl R, Winklhofer E, Ganippa LC (2002) Primary break-up model for diesel jets based on locally resolved flow properties in the injection hole. ILASS-Europe 2002, Zaragoza, 9–11 September
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Ganippa, L.C., Bark, G., Andersson, S. et al. Cavitation: a contributory factor in the transition from symmetric to asymmetric jets in cross-flow nozzles. Exp Fluids 36, 627–634 (2004). https://doi.org/10.1007/s00348-003-0736-4
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DOI: https://doi.org/10.1007/s00348-003-0736-4