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Effects of Cavitation in Common-Rail Diesel Nozzles on the Soot Formation Process
Technical Paper
2013-01-1602
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A fundamental study to experimentally analyze the effect of cavitation in common-rail diesel nozzles on the soot formation process was carried out. The soot content was characterized by measuring the soot radiation, and an original methodology was developed to suitably characterize the soot formation process from this soot content. After a significant effort to overcome the different difficulties when analyzing the experimental data, the results seem to show a promising conclusion: cavitation reduces the soot formation rate. This reduction is explained, on the one hand, because it leads to a reduction in the effective diameter, thus diminishing the equivalence fuel/air ratio at the lift-off length; and, on the other hand, because it provokes an increase in effective velocity, thus increasing the lift-off length and reducing the corresponding equivalence fuel/air ratio. Concerning this last aspect, the experimental results seem to show that the lift-off length is significantly higher than what may be expected taking into account the increase in effective velocity and the decrease in effective diameter, thus giving evidence that an additional effect must exist to fully explain the increased lift-off length. A possible explanation for this additional increase in the lift-off length could be the higher level of turbulence of the flow exiting the injector, which might lead to a stabilization of the lift-off further downstream. Based on the results obtained in this study, the cylindrical nozzles under cavitating conditions may offer a potential to reduce soot emissions in some specific applications.
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Citation
Payri, F., Lopez, J., Garcia, A., de la Garza de Leon, O. et al., "Effects of Cavitation in Common-Rail Diesel Nozzles on the Soot Formation Process," SAE Technical Paper 2013-01-1602, 2013, https://doi.org/10.4271/2013-01-1602.Also In
References
- Arrègle J. , Pastor J. V. , López J. J. , and García A. Insights on postinjection-associated soot emissions in direct injection diesel engines Combustion and Flame 154 448 461 2008
- Thurnheer T. , Edenhauser D. , Soltic P. , Schreiber D. , Kirchen P. , and Sankowski A. Experimental investigation on different injection strategies in a heavy-duty diesel engine: emissions and loss analysis Energy Conversion and Management 52 457 467 2011
- Pickett L. M. and Siebers D. L. Soot in diesel fuel jets: effects of ambient temperature, ambient density, and injection pressure Combustion and Flame 138 114 135 2004
- Pickett L. M. and Siebers D. L. An investigation of diesel soot formation processes using micro-orifices Proceeding of the Combustion Institute 29 655 662 2002
- Siebers , D. and Higgins , B. Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions SAE Technical Paper 2001-01-0530 2001 10.4271/2001-01-0530
- Pickett L. M. and Siebers D. L. Orifice diameter effects on diesel fuel jet flame structure Journal of Engineering for Gas Turbines and Power 127 187 196 2005
- Idicheria , C. and Pickett , L. Soot Formation in Diesel Combustion under High-EGR Conditions SAE Technical Paper 2005-01-3834 2005 10.4271/2005-01-3834
- Siebers , D. , Higgins , B. , and Pickett , L. Flame Lift-Off on Direct-Injection Diesel Fuel Jets: Oxygen Concentration Effects SAE Technical Paper 2002-01-0890 2002 10.4271/2002-01-0890
- Payri R. , Salvador F. J. , Gimeno J. , and Novella R. Flow regime effects on non-cavitating injection nozzles over spray behavior International Journal of Heat and Fluid Flow 32 273 284 2011
- Desantes , J. , Arrègle , J. , López , J. , and Hermens , S. Experimental Characterization of Outlet Flow for Different Diesel Nozzle Geometries SAE Technical Paper 2005-01-2120 2005 10.4271/2005-01-2120
- Dernotte J. , Hespel C. , Foucher F. , Houillé S. , and Mounaïm-Rousselle C. Experimental study of the influence of fuel physical properties on the diesel injection process in non-vaporizing conditions ILASS-2011 Estoril, Portugal September 2011
- Dernotte J. , Hespel C. , Foucher F. , Houillé S. , and Mounaïm-Rousselle C. Influence of physical fuel properties on the injection rate in a diesel injector Fuel 96 153 160 2012
- López J. J. , Salvador F. J. , de la Garza O. A. , and Arrègle J. A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles Energy Conversion and Management 64 415 423 2012
- Payri F. , Payri R. , Salvador F. J. , and Martínez-López J. A contribution to the understanding of cavitation effects in diesel injector nozzles through a combined experimental and computational investigation Computers and Fluids 58 88 101 2012
- Arcoumanis , C. , Flora , H. , Gavaises , M. , Kampanis , N. et al. Investigation of Cavitation in a Vertical Multi-Hole Injector SAE Technical Paper 1999-01-0524 1999 10.4271/1999-01-0524
- He L. and Ruiz F. Effect of cavitation on flow and turbulence in plain orifices for high-speed atomization Atomization and Sprays 5 569 584 1995
- Som S. , Ramirez A. I. , Longman D. E. and Aggarwal S. K. Effect of nozzle orifice geometry on spray combustion, and emission characteristics under diesel engine conditions Fuel 90 3 1267 1276 2011
- Schmidt D. L. , and Corradini M. L. Analytical prediction of the exit flow of cavitating orifices Atomization and Sprays 7 6 603 616 1997
- Payri R. , García J. M. , Salvador F. J. , and Gimeno J. Using spray momentum flux measurement to understand the influence of diesel nozzle geometry on spray characteristics Fuel 84 551 561 2005
- Payri R. , Salvador F. J. , Gimeno J. , and Zapata L. D. Diesel nozzle geometry influence on spray liquid-phase fuel penetration in evaporative conditions Fuel 87 1165 1176 2008
- Salvador F. J. , Hoyas S. , Novella R. , and Martínez-López J. Numerical simulation and extended validation of two-phase compressible flow in diesel injector nozzles Proc. IMechE Part D: J. Automobile Engineering 225 545 563 2010
- Desantes , J. , Payri , R. , Salvador , F. , and Gimeno , J. Measurements of Spray Momentum for the Study of Cavitation in Diesel Injection Nozzles SAE Technical Paper 2003-01-0703 2003 10.4271/2003-01-0703
- Naber , J. and Siebers , D. Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays SAE Technical Paper 960034 1996 10.4271/960034
- Arai M. , Shimizu M. , and Hiroyasu H. Similarity between the breakup lengths of a high speed liquid jet in atmospheric and pressurized conditions CLASS-91 Gaithersburg, Maryland 1991
- Hiroyasu H. , Arai M. , and Shimizu M. Break-up length of a liquid jet and internal flow in a nozzle ICLASS-91 Gaithersburg, Maryland 1991
- Soteriou , C. , Andrews , R. , and Smith , M. Direct Injection Diesel Sprays and the Effect of Cavitation and Hydraulic Flip on Atomization SAE Technical Paper 950080 1995 10.4271/950080
- Schmidt D. P. , and Corradini M. L. The internal flow of diesel fuel injector nozzles: a review Internal Journal of Engine Research 2 1 2001
- Payri R. , Molina S. , Salvador F. J. , and Gimeno J. A study of the relation between nozzle geometry, internal flow and characteristics in diesel fuel injection systems KSME International Journal 18 7 1222 1235 2004
- Khatamnezhad H. , Khalilarya S. , Jafarmadar S. , Nemati A. , and Jafari B. The influence of cavitation phenomenon in a diesel injector on the spray characteristics and combustion process of a DI diesel engine Australian Journal of Basic and Applied Sciences 5 6 538 555 2011
- Benajes J. , Molina S. , González C. , and Donde R. The role of nozzle convergence in diesel combustion Fuel 87 1849 1858 2008
- Payri , F. , Arrègle , J. , López , J. , and Hermens , S. Effect of Cavitation on the Nozzle Outlet Flow, Spray and Flame Formation in a Diesel Engine SAE Technical Paper 2006-01-1391 2006 10.4271/2006-01-1391
- Fimml W. , Chmela F. G. , Pirker G. , and Wimmer A. Influence of cavitation in the injection nozzle on combustion in diesel engines International Journal of Engine Research 11 375 390 2010
- Macián V. , Bermúdez V. , Payri R. , and Gimeno J. New technique for the determination of the internal geometry of diesel nozzle with the use of silicone methodology Experimental Techniques 39 43 2003
- Bosch , W. The Fuel Rate Indicator: A New Measuring Instrument for Display of the Characteristics of Individual Injection SAE Technical Paper 660749 1966 10.4271/660749
- Bermúdez , V. , García , J. , Juliá , E. , and Martínez , S. Engine with Optically Accessible Cylinder Head: A Research Tool for Injection and Combustion Processes SAE Technical Paper 2003-01-1110 2003 10.4271/2003-01-1110
- Payri F. , Pastor J. V , García J. M. , and Pastor J. M. Contribution to the application of two-colour imaging to diesel combustion Measurement Science and Technology 18 2579 2598 2007
- Monin , C. Characterization of the soot formation process in a diesel diffusion flame in low temperature conditions (in Spanish) PhD. Thesis Universitat Politècnica de València 2009
- Hottel H. C. , and Broughton F. P. Determination of true temperature and total radiation from luminous gas Industrial and Engineering Chemistry 4 166 175 1932
- Lopez , J. , Garcia-Oliver , J. , Martin , J. , Chemisky , J. et al. A Soot Radiation Model for Diesel Sprays SAE Technical Paper 2012-01-1069 2012 10.4271/2012-01-1069
- Nurick W. H. Orifice cavitation and its effects on spray mixing Journal of fluids engineering 98 681 687 1976
- Tree D. R. and Svensson K. I. Soot processes in compression ignition engines Progress in Energy Combustion Science 33 272 309 2007
- García J. M. Contribution to the study of turbulent combustion of DI diesel engine sprays (in Spanish) PhD. Thesis Universitat Politècnica de València 2004
- Arrègle J. , López J. J. , García J. M. , and Fenollosa C. Development of a zero-dimensional diesel combustion model. Part 1: Analysis of the quasi-steady diffusion combustion phase Applied Thermal Engineering 23 1301 1317 2003
- Argueyrolles , B. , Dehoux , S. , Gastaldi , P. , Grosjean , L. et al. Influence of injector nozzle design and cavitation on coking phenomenon SAE Technical Paper 2007-01-1896 2007 10.4271/2007-01-1896
- Payri , F. , Arrègle , J. , López , J. , and Hermens , S. Effect of Cavitation on the Nozzle Outlet Flow, Spray and Flame Formation in a Diesel Engine SAE Technical Paper 2006-01-1391 2006 10.4271/2006-01-1391
- Desantes J. M. , Arrègle J. , López J. J. , and Cronhjort A. Scaling laws for free turbulent gas jets and diesel-like sprays Atomization and Sprays 16 443 476 2006