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Evaluation of the Predictive Capability of Diesel Nozzle Cavitation Models
Technical Paper
2007-01-0245
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The predictive capability of Lagrangian and Eulerian multi-dimensional computational fluid dynamics models accounting for the onset and development of cavitation inside Diesel nozzle holes is assessed against experimental data. These include cavitation images available from a real-size six-hole mini-sac nozzle incorporating a transparent window as well as high-speed/CCD images and LDV measurements of the liquid velocity inside an identical large-scale fully transparent nozzle replica. Results are available for different cavitation numbers, which correspond to different cavitation regimes forming inside the injection hole. Discharge coefficient measurements for various real-size nozzles operating under realistic injection pressures are also compared and match well with models' predictions.
The calculations performed have indicated that the two Eulerian models predict a large void zone inside the injection hole and fail to capture the transition from incipient to fully developed cavitation, while the Lagrangian model predicts a more diffused and gradual vapour distribution in agreement with the experimental data. However, all models have predicted similarly the velocity increase inside the injection hole caused by the presence of vapour, and a similar reduction in the nozzle discharge coefficient. Liquid turbulence was significantly underestimated by the Eulerian models in the cavitation zone showing decreasing trends in contradiction with experimental observations while this was better simulated by the Lagrangian model.
Following the comparison with experiment, the effect of cavitation model assumptions, numerical implementation, discretisation scheme, model of turbulence grid resolution and cavitation physical sub-models on the predicted results on the nozzle discharge coefficient and hole exit %blockage are evaluated. The latter includes the bubble break-up and its internal initialisation pressure, the influence of the proximity of solid boundaries on the Rayleigh-Plesset equation and the percentage nuclei volume present in the liquid. Overall, it has been found that cavitation modelling has matured to the level where it can usefully identify many of the effects of cavitation on nozzle performance, and so significantly contribute to nozzle design and optimisation.
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Citation
Giannadakis, E., Papoulias, D., Gavaises, M., Arcoumanis, C. et al., "Evaluation of the Predictive Capability of Diesel Nozzle Cavitation Models," SAE Technical Paper 2007-01-0245, 2007, https://doi.org/10.4271/2007-01-0245.Also In
References
- Soteriou, C. Andrews R.J. Smith M. Direct Injection Diesel Sprays and the Effect of Cavitation and Hydraulic Flip on Atomization SAE Paper 950080 1995
- Chaves, H. Knapp M. Kubitzek A. Obermeier F. Experimental Study of Cavitation in the Nozzle Hole of Diesel Injectors Using Transparent Nozzles SAE Paper 950290 1995
- Soteriou, C. Smith M. Andrews R.J. Diesel Injection - Laser Light Sheet Illumination of the Development of Cavitation in Orifices IMechE Paper C529/018/98 1998
- Afzal, H. Arcoumanis C. Gavaises M. Kampanis N. Internal Flow in Diesel Injector Nozzles: Modelling and Experiments IMechE Paper S492/S2/99 1999
- Arcoumanis, C. Badami M. Flora H. Gavaises M. Cavitation in Real-Size Multi-Hole Diesel Injector Nozzles SAE Paper 2000-01-1249 2000
- Arcoumanis, C. Gavaises M. Flora H. Roth H. Visualisation of Cavitation in Diesel Engine Injectors Mécanique & Industries 2 5 375 381 2001
- Roth, H. Gavaises M. Arcoumanis C. Cavitation Initiation, Its Development and Link with Flow Turbulence in Diesel Injector Nozzles SAE Paper 2002-01-0214 2002
- Payri, F. Benajes J. Pastor J.V. Molina S. Influence of the Post-Injection Pattern on Performance, Soot and NOx Emissions in a HD Diesel Engine SAE Paper 2002-01-0502 2002
- Tamaki, N. Shimizu M. Nishida K. Hiroyasu H. Effects of cavitation and internal flow on atomization of a liquid jet Atomization and Sprays 8 2 179 197 1998
- Kubota, A. Kato H. Yamaguchi H. A New Modelling of Cavitating Flows - a Numerical Study of Unsteady Cavitation on a Hydrofoil Section Journal of Fluid Mechanics 240 59 96 1992
- Avva, R.K. Singhal A. Gibson D.H. An Enthalpy Based Model of Cavitation Cavitation and Multiphase Flow Forum ASME FED. 1995
- Schmidt, D.P. Rutland C.J. Corradini M.L. A Numerical Study of Cavitating Flow Through Various Nozzle Shapes SAE Paper 971597 1997
- Grogger, H.A. Alajbegovic A. Calculation of the Cavitating Flow in Venturi Geometries using Two Fluid Model Proc. of FEDSM'98 - 1998 ASME Fluid Engineering Division Summer Meeting Washington, D.C., USA 1998
- Yuan, W. Sauer J. Schnerr G.H. Modeling and Computation of Unsteady Cavitation Flows in Injection Nozzles 1st International Colloquium on Microhydrodynamics Paris, France 2000
- Marcer, R. Le Cottier P. Chaves H. Argueyrolles B. Habchi C. Barbeau B. A Validated Numerical Simulation of Diesel Injector Flow Using a VOF Method SAE Paper 2000-01-2932 2000
- Singhal, A.K. Athavale M.M. Li H.Y. Jiang Y. Mathematical basis and validation of the full cavitation model Proc. of FEDSM'01 - 2001 ASME Fluid Engineering Division Summer Meeting New Orleans, Louisiana, USA 2001
- Singhal, A.K. Athavale M.M. Li H.Y. Jiang Y. Mathematical basis and validation of the full cavitation model Journal of Fluids Engineering-Transactions of the ASME 124 3 617 624 2002
- Giannadakis, E. Gavaises M. Roth H. Arcoumanis C. Cavitation Modelling in Single-Hole Diesel Injector Based on Eulerian-Lagrangian Approach Proc. THIESEL International Conference on Thermo- and Fluid Dynamic Processes in Diesel Engines Valencia, Spain 2004
- Brennen, C.E. Cavitation and Bubble Dynamics New York; Oxford Oxford University Press 1995
- Plesset, M.S. Prosperetti A. Bubble Dynamics and Cavitation Annual Review of Fluid Mechanics 9 145 185 1977
- Bauer, D. 2005
- Giannadakis, E. Modelling of Cavitation in Automotive Fuel Injector Nozzles Imperial College, University of London 2005
- Alajbegovic, A. Grogger H.A. Philipp H. Calculation of Transient Cavitation in Nozzle Using the Two-Fluid Model Proc. 12th Annual Conference on Liquid Atomization and Spray Systems Indianapolis, Indiana, USA 1999
- Alajbegovic, A. Meister G. Greif D. Basara B. Three phase cavitating flows in high-pressure swirl injectors Experimental Thermal and Fluid Science 26 6-7 677 681 2002
- Meyer, R.S. Billet M.L. Holl J.W. Freestream Nuclei and Traveling-Bubble Cavitation Journal of Fluids Engineering-Transactions of the ASME 114 4 672 679 1992
- Feng, Z.G. Michaelides E.E. Drag coefficients of viscous spheres at intermediate and high Reynolds numbers Journal of Fluids Engineering-Transactions of the ASME 123 4 841 849 2001
- Rusche, H. Issa R. The Effect of Voidage on the Drag Force on Particles, Droplets and Bubbles in Dispersed Two-Phase Flow Proc. 2nd Japanese-European Two-Phase Flow Group Meeting Tsukuba, Japan 2000
- Auton, T.R. The dynamics of Bubbles, Drops and Particles in Motion in Liquids, in Department of Applied Mathematics and Theoretical Physics University of Cambridge 1984
- van Wijngaarden, L. Some Problems in the Formulation of the Equations for Gas/Liquid Flows, in Theoretical and Applied Mechanics Koiter W.T. North-Holland Publishing Co Amsterdam, The Netherlands 1976
- Bagchi, P. Balachandar S. Shear versus vortex-induced lift force on a rigid sphere at moderate Re Journal of Fluid Mechanics 473 379 388 2002
- Farrell, K.J. Eulerian/Lagrangian analysis for the prediction of cavitation inception Journal of Fluids Engineering-Transactions of the ASME 125 1 46 52 2003
- Moss, W.C. Levantin J.L. Szeri A.J. A New Damping Mechanism in Strongly Collapsing Bubbles Proc. R. Soc. London A 456 2004 2983 2994 2000
- Hinze, J.O. Turbulence 2nd New York McGraw-Hill 309 1975
- Hsiao, C.-T. Chahine G.L. Liu H.L. Scaling Effect on Bubble Dynamics in a Tip Vortex Flow: Prediction of Cavitation Inception and Noise Report 98007-1 Dynaflow Inc. 2000
- Martínez-Bazán, C. Montañés J.L. Lasheras J.C. On the breakup of an air bubble injected into a fully developed turbulent flow. Part 1. Breakup frequency Journal of Fluid Mechanics 401 157 182 1999
- Gavaises, M. Modelling of Diesel Fuel Injection Processes Imperial College, University of London 1997
- Sato, Y. Sekoguchi K. Liquid velocity distribution in two-phase bubble flow International Journal of Multiphase Flow 2 79 95 1975
- Theofanous, T.G. Sullivan J. Turbulence in 2-Phase Dispersed Flows Journal of Fluid Mechanics 116 343 362 1982
- Ishii, M. Mishima K. 2-Fluid Model and Hydrodynamic Constitutive Relations Nuclear Engineering and Design 82 2-3 107 126 1984
- Roth, H. Giannadakis E. Gavaises M. Arcoumanis C. Omae K. Sakata I. Nakamura M. Yanagihara H. Effect of Multi-Injection Strategy on Cavitation Development in Diesel Injector Nozzle Holes SAE Paper 2005-02-1237, SAE Transactions 2005
- Soteriou, C. Lambert M. Zuelch S. Passerel D. The flow characteristics of high efficiency Diesel nozzles with enhanced geometry holes Proc. THIESEL International Conference on Thermo- and Fluid Dynamic Processes in Diesel Engines Valencia, Spain 2006