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A Numerical Study of the Influence of Diesel Nozzle Geometry on the Inner Cavitating Flow
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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In order to analyze the influence of nozzle geometry on the internal flow characteristics of a Diesel injector, a CFD analysis of the flow through various nozzle geometries has been carried out with a commercial code. This program includes a numerical model simulating the effect of cavitation. For the flow simulation, cylindrical and conical nozzles with different grades of hydro-grinding were used in order to observe the individual effects of these geometrical parameters.
The model predicts accurately the onset of cavitation, but is very limited for strongly cavitating flow, so that the analysis of the solution may only be qualitatively assessed. However, the simulations confirm the tendency observed in experiments, that the nozzle geometry significantly influences the inner flow characteristics. In particular, by increasing the hydro-grinding radius of the orifice inlet, the mean outlet velocity near the wall and the discharge coefficient are increased, while the zone of cavitating flow is reduced. In addition, it was found that conical nozzles do not produce cavitation.
CitationPayri, R., Margot, X., and Salvador, F., "A Numerical Study of the Influence of Diesel Nozzle Geometry on the Inner Cavitating Flow," SAE Technical Paper 2002-01-0215, 2002, https://doi.org/10.4271/2002-01-0215.
- Arai, M., Shimizu, M., Hiroyasu, H. , “Similarity between the breakup lengths of a high speed liquid jet in atmospheric and pressurized conditions. In ICLASS-91, Gaithersburg, Maryland.
- Arcoumanis, C., Nouri, J.M., Andrews, R.J. , “Application of refractive Index matching to a diesel nozzle internal flow”.Proc. ImechE seminar on diesel fuel injection system, April 14-15
- Arcoumanis, C., Gavaises, M., Nouri, J.M., Abdul-Wahab, E. [1998 a], “Analysis of the flow in the nozzle of a vertical multi-hole diesel engine injector”. SAE Paper 980811.
- Arcoumanis, C., Gavaises, M. [1998 b], “Linking nozzle flow with spray characteristics in a diesel fuel injection system”. Atomization and Sprays, vol. 8, pp. 307-347.
- Arcoumanis, C., Badami, M., Flora, H., Gavaises, M. , “Cavitation in real-size multi-hole diesel injector nozzles”. SAE Paper 2000-01-1249, 2000.
- Avva, R. K., Singhal, A. Gibson, D. H. , “An enthalpy based model of cavitation”. ASME, Hilton Head.
- Badock, C., Wirth, R., Kampmann, S. Tropea, C. , “Fundamental study of the influence of cavitation on the internal flow and atomization of diesel sprays”. Proc. 13th ILASS-Europe 97, pp 53-59. Florence, Jule, 8-10.
- Badock, C., Wirth, R., Fath, A., Leipertz, A. , “Application of laser light sheet technique for the investigation of cavitation phenomena in real size diesel injection nozzles”. Proc, 14th ILASS- Europe 98, pp 236-241, Manchester, July 6-8, 1998.
- Badock, C., Wirth, R., Tropea, C. , “The influence of hydro-grinding on cavitation inside a diesel injection nozzle and primary break-up under unsteady pressure conditions”. Proc. 15th ILASS-Europe 99, Toulouse, July 5-7, 1999.
- Bunnell, R.A., Heister, S.D., Yen, C., Collicott, S.H. , “Cavitating injector flows: a validation of numerical models and simulations of pressure atomizers”, Atomization and Sprays, 9, pp. 445-465.
- Chaves, H., Knapp, M., Kubitzek, A. , “Experimental study of cavitation in the nozzle hole of diesel injectors using transparent nozzles”. SAE Paper 950290.
- Chaves, H., Obermeier, F. , “Correlation between light absortion signals of cavitating nozzle flow within and outside of the hole of a transparent diesel injection nozzle”. Proc. 15th ILASS-Europe, pp. 224-229. Toulouse, July 5-7.
- Chen, Y., Heister, S. D. , “Two-phase modeling of cavitated flows”. In ASME Cavitation and Multiphase Flow Forum, Reno, Nevada.
- Date, K., Nobechi, H., Kano, H., Kato, M., Oya, T. , “Experimental analysis of fuel flow characteristics in the nozzle for direct injection engines”. SAE paper 931002.
- Delannoy, Y., Kueny, J. L. , “Two phase flow approach in unsteady cavitation modelling”. In ASME Cavitation and Multiphase Flow Forum, ASME FED Vol. 98, pp. 153-158
- Desantes, J.M., Arrègle, J., Rodríguez, P. , “Computational model for simulation of diesel injector systems” SAE Paper 1999-01-0915.
- Fluent 5. User's guide Volume 3.
- He, L., Ruiz, F. , “Effect of cavitation on flow and turbulence in plain orifices for high-speed atomization”. Atomization and Sprays, vol. 5, pp. 569-584.
- Hiroyasu, H., Arai, M., Shimizu, M. , Break-up length of a liquid jet and internal flow in a nozzle. In ICLASS-91, Gaithersburg, Maryland, July.
- Kato, M., Kano, H., Date, K., Oya, T., Niizuma, K. , “Flow analysis in nozzle hole in consideration of cavitation”. SAE Paper 970052.Knox-Kelecy, A.L., Farrell, P.C. .
- Knox-Kelecy, A.L., Farrell, P.C. ], “Spectral characteristics of turbulent flow in a scale model of a diesel fuel injector nozzle”. SAE paper 972942.
- Kubota, A., Kato, H., Yamaguchi, H. “A new modelling of cavitating flows: A numerical study of unsteady cavitation on a hydrofoil section”, J. Fluid Mech., 240, pp.59-96.
- Schmidt, D. P., et al , “Detection of cavitation in fuel injector nozzles”. In 8th ISTP Conference, San Francisco, California.
- Schmidt, D. P., Rutland, C. J., Corradini, M. L. , “A numerical study of cavitating flow through various nozzle shapes”. SAE Paper 971597.
- Schmidt, D. P., Corradini, M. L., Rutland, C. , “A two-dimensional, non-equilibrium model of flashing nozzle flow”. In 3rd ASME/JSME Joint Fluids Engineering Conference.
- Soteriou, C., Andrews, R., Smith, M. , “Direct injection diesel sprays and the effect of cavitation and hydraulic flip on atomization”. SAE Paper 950080.
- Soteriou, C., Smith, M., Andrews, R. , “Diesel injector laser light sheet illumination of the development of cavitation in orifices”. Proc. ImechE C529/018/98.