This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Comparison of the Homogeneous Relaxation Model and a Rayleigh Plesset Cavitation Model in Predicting the Cavitating Flow Through Various Injector Hole Shapes
Technical Paper
2013-01-1613
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Two cavitation models are evaluated based on their ability to reproduce the development of cavitation experimentally observed by Winklhofer et al. inside injector hole geometries. The first is Singhal's model, derived from a reduced form of the Rayleigh-Plesset equation, implemented in the commercial CFD package Fluent. The second is the homogeneous relaxation model, a continuum model that uses an empirical timescale to reproduce a range of vaporization mechanisms, implemented in the OpenFOAM framework. Previous work by Neroorkar et al. validated the homogeneous relaxation model for one of the nozzle geometries tested by Winklhofer et al. The present work extends that validation to all the three geometries considered by Winklhofer et al in order to compare the models' ability to capture the effects of nozzle convergence.
As showed by the comparison between numerical and experimental data, both considered cavitation models well predict the effect of nozzle convergence on mass flow rate and the onset of cavitation and choking. However, they show lack of accuracy in reproducing vapor and flow velocity distributions. This may be due to condensation effects, assumptions regarding momentum transfer between phases, and the inadequacy of existing turbulence models for cavitating conditions.
Recommended Content
Authors
Citation
Brusiani, F., Negro, S., Bianchi, G., Moulai, M. et al., "Comparison of the Homogeneous Relaxation Model and a Rayleigh Plesset Cavitation Model in Predicting the Cavitating Flow Through Various Injector Hole Shapes," SAE Technical Paper 2013-01-1613, 2013, https://doi.org/10.4271/2013-01-1613.Also In
References
- Mahr , B. Future and Potential of Diesel Injection Systems THIESEL 2002 Conference on Thermo- and Fluid-Dynamic Processes in Diesel Engines
- Roth , H. , Gavaises , M. , and Arcoumanis , C. Cavitation Initiation, Its Development and Link with Flow Turbulence in Diesel Injector Nozzles SAE Technical Paper 2002-01-0214 2002 10.4271/2002-01-0214
- Gavaises , M. and Andriotis , A. Cavitation Inside Multi-hole Injectors for Large Diesel Engines and Its Effect on the Near-nozzle Spray Structure SAE Technical Paper 2006-01-1114 2006 10.4271/2006-01-1114
- He , L. and Ruiz , F. Effect of Cavitation on Flow and Turbulence in Plain Orifice for High-Speed Atomization Atomization and Sprays 1995 5 6 569 584
- Soteriou , C. , Andrews , R.J. , Torres , N. , Smith , M. , and Kunkulagunta , R. Through the Diesel Nozzle Hole - A Journey of Discovery II Proc. ILASSEurope Zurich, Switzerland September 2001
- Som , S. , Aggarwal , S. , El-Hannouny , E. , and Longman , D. Investigation of nozzle flow and cavitation characteristics in a diesel injector Journal of Engineering for Gas Turbines and Power 132 4 2010
- Senda , J. , Hojyo , Y. , and Fujimoto , H. Modelling of Atomization Process in Flash Boiling Spray SAE Technical Paper 941925 1994 10.4271/941925
- Schmidt , D. P. , Rakshit S. , and Neroorkar , K Thermal and Inertial Equilibrium in Small, High-Speed, Cavitating Nozzle Simulations 11th Triennial International Conference on Liquid Atomization and Spray Systems Vail, Colorado USA July 2009
- Brennen , C. E. Cavitation and Bubble Dynamics Oxford University Press Oxford 1995
- Singhal , A. K. , Li , H. Y. , Athavale , M. M. , and Jiang , Y. Mathematical Basis and Validation of the Full Cavitation Model ASME FEDSM'01 New Orleans, Louisiana 2001
- Zwart , P.J. , Gerber , A.G. , and Belamri , T. A Two-Phase Flow Model for Predicting Cavitation Dynamics Fifth International Conference on Multiphase Flow Yokohama, Japan 2004
- Neroorkar , K. , Shields , B. , Grover , R. Jr. , Plazas Torres , A. et al. Application of the Homogeneous Relaxation Model to Simulating Cavitating Flow of a Diesel Fuel SAE Technical Paper 2012-01-1269 2012 10.4271/2012-01-1269
- Gopalakrishnan , S. and Schmidt , D. A Computational Study of Flashing Flow in Fuel Injector Nozzles SAE Int. J. Engines 1 1 160 170 2009 10.4271/2008-01-0141
- Neroorkar , K. Modeling of Flash Boiling Flows in Injectors with Gasoline-Ethanol Fuel Blends PhD thesis The University of Massachusetts-Amherst 2011
- Neroorkar , K. and Schmidt , D. A Computational Investigation of Flash-Boiling Multi-hole Injectors with Gasoline-Ethanol Blends SAE Technical Paper 2011-01-0384 2011 10.4271/2011-01-0384
- Winklhofer , E. , Kull , E. , Kelz , E. , and Morozov , A. Comprehensive hydraulic and flow field documentation in model throttle experiments under cavitation conditions 17th Annual Conference on Liquid Atomization and Spray Systems Zurich, Switzerland September 2001
- Weller , H. , Tabor , G. , Jasak , H. , and Fureby , C. A tensorial approach to computational continuum mechanics using object-oriented techniques Computers in Physics 12 6 620 631 1998
- Schmidt , D. P. Cavitation in Diesel Fuel Injector Nozzles PhD thesis The University of Wisconsin-Madison 1997
- Negro , S. , Brusiani , F. , and Bianchi , G. Superheated Sprays of Alternative Fuels for Direct Injection Engines SAE Technical Paper 2012-01-1261 2012 10.4271/2012-01-1261
- Negro , S. , Brusiani , F. , and Bianchi , G. A Numerical Model for Flash Boiling of Gasoline-Ethanol Blends in Fuel Injector Nozzles SAE Int. J. Fuels Lubr. 4 2 237 256 2011 10.4271/2011-24-0003
- Downar-Zapolski , P. , Bilicki , Z. , Bolle , L. , and Franco , F. The Non-Equilibrium Relaxation Model for One- Dimensional Flashing Liquid Flow 3rd ASME/JSME Joint Fluids Engineering Conference 208 616 1999
- Schmidt , D. , Gopalakrishnan , S. , and Jasak , H. Multidimensional Simulation of Thermal Non-Equilibrium Channel Flow Intl. J. of Multiphase Flow 36 284 292 2010
- Reocreux , M. Contribution a letude des debits critiques en ecoulement diphasique eau-vapeur PhD thesis Universite Scientifique Medicale de Grenoble, France 1974
- Versteeg , H.K. , Malalasekera , W. An Introduction to Computational Fluid Dynamics: The Finite Volume Method 2nd Longman 2006
- Launder , B. E. and Spalding , D. B. The Numerical Computation of Turbulent Flows Computer Methods in Applied Mechanics and Engineering 3 269 289 1974
- Weber , J. , Peters , N. , Diwakar , R. , Siewert , R. et al. Simulation of the Low-Temperature Combustion in a Heavy Duty Diesel Engine SAE Technical Paper 2007-01-0904 2007 10.4271/2007-01-0904