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Numerical Modeling of Spray Formation under Flash-boiling Conditions
Technical Paper
2020-01-0328
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Flash boiling occurs in sprays when the ambient gas pressure is lower than the saturation pressure of the injected fuel. In the present work, a numerical study was conducted to investigate solid-cone spray behaviors under various flash-boiling conditions. A new spray cone angle correlation that is a function of injection parameters was developed and used for spray initialization at the nozzle exit to capture plume interactions and the global spray shape. The spray-breakup regime control was adjusted to enable catastrophic droplet breakup, characterized by Rayleigh-Taylor (RT) breakup, near the nozzle exit. The model was validated against experimental spray data from five different injectors, including both multi-hole and single-hole injectors, with injection pressure varying from 100 to 200 bar. Different fuels, including iso-octane, n-heptane, n-pentane, ethanol, and n-butanol, were investigated under a wide range of flash-boiling conditions, in which flash boiling was induced by high injected fuel temperature, ranging from 323 to 493 K, and/or low ambient gas pressure, ranging from 0.1 bar to atmospheric. It is found that flash boiling can significantly increase the spray cone angle near the nozzle exit, causing spray spreading and obvious plume interactions, which strongly influence the global spray shape. For flash boiling induced by high fuel temperature, penetration length tends to decrease because of enhanced liquid breakup and vaporization. For flash boiling induced by low ambient gas pressure, the reduced resistance from the ambient gas and enhanced droplet breakup lead to competing effects on spray penetration. By using the modified breakup regime control and spray cone angle correlation, the model shows good agreement with experimental data in capturing spray spreading, plume interactions and global spray shape in all simulated cases. The modeling approach proposed in this paper is expected to be universally applicable to all solid-cone flash-boiling sprays.
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Tao, M., Liang, L., Wang, Y., and Meeks, E., "Numerical Modeling of Spray Formation under Flash-boiling Conditions," SAE Technical Paper 2020-01-0328, 2020, https://doi.org/10.4271/2020-01-0328.Data Sets - Support Documents
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References
- Sher , E. , Bar-Kohany , T. , and Rashkovan , A. Flash-Boiling Atomization Prog. Energy Combust. Sci. 34 4 417 439 2008 10.1016/j.pecs.2007.05.001
- Lee , J. , Madablushi , R. , Fotache , C. , Gopalakrishnan , S. , and Schmidt , D. Flashing Flow of Superheated Jet Fuel P. Combust. Inst. 32 2 3215 3222 2009 10.1016/j.proci.2008.06.153
- Goto , S. , Yamamoto , Y. , Sugi , T. , Yasunaga , T. et al. A Simulation Model of Spray Flash Desalination System IFAC Proceedings Volumes 41 2 15909 15914 2008
- Cheng , W.L. , Zhang , W.W. , Chen , H. , and Hu , L. Spray Cooling and Flash Evaporation Cooling: The Current Development and Application Renew. Sust. Energ. Rev. 55 614 628 2016 10.1016/j.rser.2015.11.014
- Schmitz , I. , Ipp , W. , and Leipertz , A. Flash Boiling Effects on the Development of Gasoline Direct-Injection Engine Sprays SAE Technical Paper 2002-01-2661 2002 https://doi.org/10.4271/2002-01-2661
- Zeng , W. , Xu , M. , Zhang , G. , Zhang , Y. , and Cleary , D.J. Atomization and Vaporization for Flash-Boiling Multi-Hole Sprays with Alcohol Fuels Fuel 95 287 297 2012 10.1016/j.fuel.2011.08.048
- Senda , J. , Nishikori , T. , Tsukamoto , T. , and Fujimoto , H. Atomization of Spray under Low-Pressure Field from Pintle Type Gasoline Injector SAE Technical Paper 920382 1992 https://doi.org/10.4271/920382
- Daisuke , K. Spray Characteristic of Multicomponent Fuel The 10th International Symposium on Flow Visualization 2002
- Kamoun , H. , Lamanna , G. , Weigand , B. , and Steelant , J. High-Speed Shadowgraphy Investigations of Superheated Liquid Jet Atomization ILASS Americas 2010
- Gopalakrishnan , S. and Schmidt , D. A Computational Study of Flashing Flow in Fuel Injector Nozzles SAE Int. J. Engines 1 1 160 170 2009 https://doi.org/10.4271/2008-01-0141
- Janet , J.P. , Liao , Y. , and Lucas , D. Heterogeneous Nucleation in CFD Simulation of Flashing Flows in Converging-Diverging Nozzles Int. J. Multiph. Flow 74 106 117 2015 https://doi.org/10.1016/j.ijmultiphaseflow.2015.04.005
- Rachakonda , S.K. , Wang , Y. , Grover , R.O. Jr. , Moulai , M. et al. A Computational Approach to Predict External Spray Characteristics for Flashing and Cavitating Nozzles Int. J. Multiph. Flow 106 21 33 2018 https://doi.org/10.1016/j.ijmultiphaseflow.2018.04.012
- Price , C. , Hamzehloo , A. , Aleiferis , P. , and Richardson , D. Numerical Modelling of Fuel Spray Formation and Collapse from Multi-Hole Injectors under Flash-Boiling Conditions Fuel 221 1 518 541 2018 https://doi.org/10.1016/j.fuel.2018.01.088
- Hou , S. and Schmidt , D.P. Adaptive Collision Meshing and Satellite Droplet Formation in Spray Simulations Int. J. Multiph. Flow 32 8 935 956 2006 https://doi.org/10.1016/j.ijmultiphaseflow.2006.02.013
- Ra , Y. and Reitz , R.D. A Vaporization Model for Discrete Multi-Component Fuel Sprays Int. J. Multiph. Flow 35 2 101 117 2009 https://doi.org/10.1016/j.ijmultiphaseflow.2008.10.006
- Beale , J.C. and Reitz , R.D. Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model Atomization Spray 9 623 650 1999 10.1615/AtomizSpr.v9.i6.40
- von Kuensberg Sarre , C. , Kong , S. , and Reitz , R. Modeling the Effects of Injector Nozzle Geometry on Diesel Sprays SAE Technical Paper 1999-01-0912 1999 https://doi.org/10.4271/1999-01-0912
- Lacey , J. , Poursadegh , F. , Brear , M.J. , Gordon , R. et al. Generalizing the Behavior of Flash-Boiling, Plume Interaction and Spray Collapse for Multi-Hole, Direct Injection Fuel 200 345 356 2017 https://doi.org/10.1016/j.fuel.2017.03.057
- https://ecn.sandia.gov/data/melbourne-spray-g-data/
- Yan , J. , Chen , T. , Gao , S. , Lee , T. et al. Macroscopic and Microscopic Characteristics of Flash Boiling Spray with Binary Fuel Mixtures SAE Technical Paper 2019-01-0274 2019 https://doi.org/10.4271/2019-01-0274
- Aleiferis , P.G. and Van Romunde , Z.R. An Analysis of Spray Development with Iso-Octane, n-Pentane, Gasoline, Ethanol and n-Butanol from a Multi-Hole Injector under Hot Fuel Conditions Fuel 105 143 168 2013 https://doi.org/10.1016/j.fuel.2012.07.044
- Mojtabi , M. , Wigley , G. , and Helie , J. The Effect of Flash Boiling on the Atomization Performance of Gasoline Direct Injection Multistream Injectors Atomization Spray 24 6 467 493 2014 10.1615/AtomizSpr.2014008296
- Postrioti , L. , Bosi , M. , Cavicchi , A. , Abuzahra , F. et al. Momentum Flux Measurement on Single-Hole GDI Injector under Flash-Boiling Condition SAE Technical Paper 2015-24-2480 2015 https://doi.org/10.4271/2015-24-2480
- Matsumura , E. , Senda , J. , Imori , K. , and Sakai , Y. Experimental Investigation of Superheated Fuel Spray Characteristics for D.I.S.I Engines SAE Technical Paper 2017-01-0820 2017 https://doi.org/10.4271/2017-01-0820