Jet and droplet breakup modelling approaches

• Autorzy: Kapusta Ł. J. , Jaworski P. , Kowalski J.

Identyfikatory

DOI

10.5604/12314005.1165975

• Języki publikacji: EN

Abstrakty

EN

Three-dimensional computational fluid dynamics (CFD) plays important role in engines development. The mixture formation in a direct-injection piston engines poses a huge challenge in successful simulations of the engine processes. It is due to the fact that the spray as a two-phase flow complicates the computational process. Moreover, this multiphase flow is not uniform. Three main zones, depending on the distance from the nozzle exit are visible when a liquid is injected. Very dense so called “thick” in a direct vicinity of the injector hole, than “thin” as a result of pri-mary breakup downstream the injector and finally in the certain distance from the injector appears “very thin” region as a result of secondary breakup. It is important to take into account that the liquid phase in various regimes behaves differently and is under influence of different phenomena. The modelling approach needs to take in to consideration all those elements. This paper focuses on presentation of the theory and numerical models for primary and secondary breakup phenomena. The primary breakup is a process that results from a combination of three mechanisms: turbu-lence within liquid phase, implosion of cavitation’s bubbles and aerodynamic forces acting on a liquid jet. Secondary breakup regime occurs mainly due to the aerodynamic interactions between the liquid and the gaseous phase.

Słowa kluczowe

EN

spray; modelling; simulation; breakup; injection; CFD; computational fluid dynamics CFD

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2015
• Tom: Vol. 22, No. 3
• Strony: 83--90
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Kapusta Ł. J.

• Warsaw University of Technology, Institute of Heat Engineering Nowowiejska Street 21/25, 00-665 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Jaworski P.

• Warsaw University of Technology, Institute of Heat Engineering Nowowiejska Street 21/25, 00-665 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Kowalski J.

• Gdynia Maritime University, Department of Engineering Sciences Morska Street 81-87, 81-226 Gdynia, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Dukowicz, J. K., A particle-fluid numerical model for liquid sprays, J. Comput. Phys, Vol. 35, pp. 229-53, 1980.
• [2] Heywood, J. B., Internal Combustion Engine Fundamentals, McGraw-Hill, 1988.
• [3] Stiesch, G., Modeling Engine Spray and Combustion Processes, Springer, 2003.
• [4] Arcoumanis, C., Gavaises, M., French, B., Effect of fuel injection processes on the structure of diesel sprays, SAE Tech. Pap., 970799, 1997.
• [5] Nurick, W. H., Orifice cavitation and its effect on spray mixing, J. Fluids. Eng., Vol. 98, pp. 681-687, 1976.
• [6] Kercheva, B., Kapusta, Ł. J., Teodorczyk, A., LES numerical study on n-hexane injection in a compression ignition engine, Arch. Combust., 2, 2014.
• [7] Spray Module, AVL fire version 2013.1, AVL List Gmbh, Graz, Austria 2013.
• [8] Pilch, M., Erdman, C., Use of breakup time data and velocity history data to predict the maximum size of stable fragments for acceleration-induced breakup of a liquid drop, Int. J. Multiph. Flow., Vol. 13, pp. 741-757, 1987.
• [9] O’Rourke, P. J., Amsden, A. A., The TAB method for numerical calculation of spray droplet break-up, SAE Tech. Pap., 872089, 1987.
• [10] Reitz, R. D., Diwakar, R., Structure of high-pressure fuel sprays, SAE Tech. Pap., 870598, 1987.
• [11] Huh, K. Y., Gosman, A. D., A phenomenological model of diesel spray atomisation, Proc. Int. Conf. Multiph. Flows, Tsukuba, Japan 1991.
• [12] Su, T. F., Patterson, M. A., Reitz, R. D., Farrell, P. V., Experimental and numerical studies of high pressure multiple injection sprays, SAE Tech. Pap., 960861, 1996.
• [13] Reitz, R. D., Modeling atomization processes in high-pressure vaporizing sprays, At. Spray Technol., Vol. 3, pp. 309-337, 1987
• [14] Vujanović, M., Numerical modelling of multiphase flow in combustion of liquid fuel, PhD thesis, University of Zagreb, 2010.
• [15] Dukowicz, J. K., Quasi-steady droplet phase change in the presence of convection, 1979.
• [16] Jankowski, A., Modelling of Combustion Processes of Liquid Fuels, Journal of KONES, Powertrain and Transport, Vol. 19, No 4, pp. 239-244, Warsaw 2012.
• [17] Jankowski, A., Laser Research of Fuel Atomization and Combustion Processes in the Aspect of Exhaust Gases Emission, Journal of KONES Vol. 15, No. 1, pp. 119-126, Warsaw 2008.
• [18] Jankowski, A., Siemińska-Jankowska, B., Sandel, A., Bocheński, C., Investigation of the Fuel Spray Atomization Spectrum in Common Rail System for Diesel Engines, Journal of KONES, Vol. 10, No. 1-2, pp. 53-64, Warsaw 2003.
• [19] Żurek, J., Jankowski, A.: Experimental and Numerical Modelling of Combustion Process of Liquid Fuels under Laminar Conditions, Journal of KONES, Vol. 21, No. 3, s. 309-316, Warsaw 2014.