Analysing the cavitation phenomena in in-nozzle flows

• Autorzy: Vajda B. , Žunič Z. , Kegl B.
• Języki publikacji: EN

Abstrakty

EN

The geometry of the diesel fuel injection nozzle and fuel flow characteristics in the nozzle significantly affects the processes of fuel atomization, combustion and formation of pollutant emissions in diesel engine. To improve the process of fuel injection, CFD packages are used. Since CPU times are often high, partial models are used for the analysis. In presented paper the influence ,of different density of mesh on the cavitation phenomena is being analysed. The theoretical backgrounds of the cavitation occurrence presented in the first part of the paper are followed by the numerical analyses of two-phase flow in same simplified nozzle models. The numerical analyses are made using computation fluid dynamic (CFD) program Fire. The numerical analysis is made for two different types of fluid, diesel (D2) and biodiesel (B 100). Numerical analysis also includes various densities of meshes and their influence on results. The two-phase flow is analysed using a two-equation approach, where all conservation equations are solved for every phase. Numerical analysis results are compared to the experimental observations of the two-phase flow available from the literature. The results are compared for various meshes and various fluid types. The results show that higher pressure yields mode cavitation and point out the importance of mesh densities.

Słowa kluczowe

EN

two-phase flow; cavitation; injector nozzle; CFD; nodalisation analysis

• 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: 2010
• Tom: Vol. 17, No. 2
• Strony: 475--482
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Vajda B.

autor

Žunič Z.

autor

Kegl B.

Bibliografia

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• [2] FIRE Version 9 – Users manual, Multiphase flow, AVL, 2009.
• [3] Ganippa, L. C., et al., The structure of cavitation and its effect on the spray pattern in a single hole diesel nozzle, SAE paper 2001-01-2008.
• [4] Ganippa, L. C., et al., Comparison of cavitation phenomena in transparent scaled-up single hole diesel nozzles, 4th international symposium on cavitation, California Institute of Technology, Pasadena, 2001.
• [5] Göschel, B., Einspritzdüsenverschleiß, Forschungverinigung Verbrenungskraftmachinen e.V., Heft R245, 1974.
• [6] Hardenberg, H., Die Nadelhubabhaengigkeit der Durchflussbeiwerte von Lochduessen fuer Direkteinspritzdieselmotoren, MTZ 46, pp. 143-146, 1985.
• [7] ISO-4113:1988, Road Vehicles- Calibration Fluid Diesel Injection Equipment.
• [8] Kato, M., et al., Flow Analysis in Nozzle Hole in Consideration of Cavitation, SAE 970052
• [9] Kavitation, Abschlüßberichtüber die Ergebnise des Schwerpunktprogramm 1966-1972, Deutsche Forschungsgemeinschafts, Boppard 1974.
• [10] König, G., et al., Analysis of flow and cavitation Phenomena in diesel injection nozzles and its effects on spray and mixture formation, 5 Internationales Symposium für Verbrennungsdiagnostik der AVL Deutschland, Baden Baden 2002.
• [11] Melcher, K., Chomiak, J., Experimentelle Untersuchung der Stroemung durch Dieseleinspritzduesen in stationaer betriebenen Grossmodel, Bosch Techn. Berichte Nr. 5, 1976.
• [12] Oishi, Y., et al., A computational Study into the Effect of the Injection Nozzle Inclintion Angle on the Flow Characteristics in Nozzle Holes, SAE Paper 920580.
• [13] Yoda, T., Tsuda, T., Influence of injection Nozzle improvement on DI Diesel Engine, SAE Paper 970356.