This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Flash Boiling Evidences of a Multi-Hole GDI Spray under Engine Conditions by Mie-Scattering Measurements
Technical Paper
2015-01-1945
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
During an injection process, a fluid undergoes a sudden pressure drop across the nozzle. If the pressure downstream the injector is below the saturation value of the fluid, superheated conditions are reached and thermodynamic instabilities realized. In internal combustion engines, flashing conditions greatly influence atomization and vaporization processes of a fuel as well as the mixture formation and combustion.
This paper reports imaging behavior of a fuel under both flash boiling and non-flash boiling conditions. A GDI injector, eight-hole, 15.0 cc/s @ 10 MPa static flow, injected a single-component fluid (iso-octane), generating the spray. Experiments were carried out in an optically-accessible constant-volume quiescent vessel by Mie-scattering technique. A C-Mos high-speed camera was used to acquire cycle-resolved images of the spray evolving in the chamber filled with N2 which pressure ranged between 0.05 and 0.3 MPa. Two sets of measurements were carried out with the injector and fuel temperature constant at ambient and 363 K, respectively. A single pulse strategy was adopted, 0.68 ms in duration, with two injection pressures: 10.0 and 20.0 MPa. Tip penetrations, cone-angles, and spray enlargements are reported at all the injection settings.
Recommended Content
Topic
Citation
Montanaro, A. and Allocca, L., "Flash Boiling Evidences of a Multi-Hole GDI Spray under Engine Conditions by Mie-Scattering Measurements," SAE Technical Paper 2015-01-1945, 2015, https://doi.org/10.4271/2015-01-1945.Also In
References
- 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
- Chang , D. , and Lee , C. Preliminary Computational Studies of Flash Boiling for Fuel Injectors in Gasoline Direct Injection Automotive Engines IECEC 2002 Paper No. 20164 2002
- Senda , J. , Hojyo , Y. , and Fujimoto , H. Modelling of Atomization Process in Flash Boiling Spray SAE Technical Paper 941925 1994 10.4271/941925
- George , A. , Tavlarides , L. L. , and Geana , Dan Phase Transitions and Thermal Behavior of Fuel-Diluent Mixtures Energy Fuels 23 6 3068 3077 2009 10.1021/ef900141j
- Xu , M. , Zhang , Y. , Zeng , W. , Zhang , G. et al. Flash Boiling: Easy and Better Way to Generate Ideal Sprays than the High Injection Pressure SAE Int. J. Fuels Lubr. 6 1 137 148 2013 10.4271/2013-01-1614
- Oza , R.D. , Sinnamon , J.F. An Experimental and Analytical Study of Flash-Boiling Fuel Injection SAE Technical Paper 830590 1983
- Park , B.S. , Lee , S.Y. An Experimental Investigation of the Flash Atomization Mechanism Atomization and Sprays 4 1994 159 179
- Yildiz , D. et al A Study on the Dynamic of a Flashing Jet Final Contract Research Report EAR0030/2002 Von Karman Institute for Fluid Dynamics 2002
- Reitz , R.D. A Photographic Study of Flash-Boiling Atomization Aerosol Science and Technology 12 1990 561 569
- Malaguti , S. , Fontanesi , S. , Cantore , G. , Allocca , L. , Montanaro A. Modelling of Primary Breakup of a Gasoline Direct Engine Multi-Hole Spray Atomization and Sprays 23 10 861 888
- Allocca , L. , Montanaro , A. , Di Gioia , R. , Bonandrini , G. Spray Characterization of a Single-Hole Gasoline Injector under Flash Boiling Conditions SAE Technical Paper 2014-32-0041 2014 10.4271/2014-32-0041
- www.sandia.gov/ecn
- Siebers D. L. Liquid-phase fuel penetration in Diesel sprays SAE paper 980809 1998
- Sher , E. , Bar Kohany , T. , Rashkovan , A. Flash Boiling Atomization Prog. Energy Combust. Sci 2008 24 417 39
- Lee , J. , Madablushi , R. , Fotache , S. , Gopalakrishnan , S. , Schmidt , D.P. Flash Flow of Superheated Jet Fuel P. Combust. Inst. 2009 32 3215 22
- Arora , R. , Morgan , C.J. , Naber , J.D. , Lee , S.Y. Flash Boiling Spray Characterization of a Gasoline Multi-hole Injector in a Heated Pressure Vessel ILASS Americas 2011 paper #162, 23rd Annual Conference on Liquid Atomization and Spray Systems Ventura May 15-18
- Zeng , W. , Xu , M. , Zhang , G. , Zhang , Y. , Cleary , D.J. Atomization and Vaporization for Flash-Boiling Multi-Hole Sprays with Alcohol Fuels Fuel 95 2012 287 297
- Allocca , L. , Montanaro , A. , Di Gioia , R. , and Bonandrini , G. Spray Characterization of a Single-Hole Gasoline Injector under Flash Boiling Conditions SAE Technical Paper 2014-32-0041 2014 10.4271/2014-32-0041
- Cleary V , Bowen P , Witlox H Flash liquid jets and two-phase droplet dispersion I. Experiments for derivation of droplet atomization correlations J. Hazard Mater 2007 142 786 96
- Witlox H , Harper M , Bowen P , Cleary V Flashing liquid jets and two-phase droplet dispersion II. Comparison and validation of droplet size and rainout formulations J. Hazard Mater 2007 142 797 809