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Momentum Flux Measurement on Single-Hole GDI Injector under Flash-Boiling Condition
Technical Paper
2015-24-2480
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Direct Injection technology for Spark Ignition engines is currently undergoing a significant development process in order to achieve its complete potential in terms of fuel conversion efficiency, while preserving the ability to achieve future, stringent emission limits. In this process, improving the fuel spray analysis capabilities is of primary importance. Among the available experimental techniques, the momentum flux measurement is one of the most interesting approaches as it allows a direct measurement of the spray-air mixing potential and hence it is currently considered an interesting complement to spray imaging and Phase Doppler Anemometry. The aim of the present paper is to investigate the fuel spray evolution when it undergoes flash boiling, a peculiar flow condition occurring when the ambient pressure in which the spray evolves is below the saturation pressure of the injected fluid. These thermodynamic conditions can occur in part load operation for GDI (Gasoline Direct Injection) engines, causing the spray flow structure and hence the mixture formation process to be completely altered with respect to standard flow conditions.
To investigate the effects of flash-boiling on the spray evolution, a single-hole GDI research injector designed by Magneti Marelli was analyzed in terms of both global spray shape evolution and of spray momentum flux. A preliminary injection rate analysis was also carried out to investigate the hydraulic behavior of the research injector. The spray tests were executed inside a quiescent vessel at ambient pressure ranging from 40 to 300 kPa. To obtain the flash-boiling conditions, both the injector fixture and the test fuel (n-heptane) temperatures were set between 30 °C and 120 °C. For the spray momentum flux tests, distances from 5 to 40 mm from the nozzle were used. Aiming to compare the internal spray structure under low and high temperature conditions, momentum spatial distribution was also investigated over planes at different distances from the nozzle. The results of this work, obtained in well-defined conditions in terms of fuel composition and spray configuration (single jet), can assist the development of CFD numerical tools as well as contribute to a better understanding of the flash-boiling phenomenon effect to the spray formation and evolution.
Authors
- Lucio Postrioti - Università degli Studi di Perugia
- Maurizio Bosi - Università degli Studi di Perugia
- Andrea Cavicchi - Università degli Studi di Perugia
- Fakhry AbuZahra - Izmir Insitute of Technology
- Rita Di Gioia - Magneti Marelli Powertrain SPA
- Giovanni Bonandrini - Magneti Marelli Powertrain SPA
Citation
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.Also In
References
- Heywood , J. B. Internal Combustion Engine Fundamentals McGraw-Hill Book Co. New York 1988
- Baumgarten , C. Mixture Formation in Internal Combustion Engines Springer-Verlach 2006 978-3-540-30835-5
- Shahed , S. and Bauer , K. Parametric Studies of the Impact of Turbocharging on Gasoline Engine Downsizing SAE Int. J. Engines 2 1 1347 1358 2009 10.4271/2009-01-1472
- 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
- Shengqiwu , Xu M. , Zhang Y. , Z G. e Li L. Analysis of Flash-boiling Spray Mechanism using a Two-Dimensional Transparent Nozzle ILASS Americas 2013
- Aleif P. e van Romunde Z. An analysis of spray development with iso-octane, n-pentane, gasoline, ethanol and n-butanol from a multi-hole injector under hot fuel conditions Elsevier 2013
- Sher E. , Bar-Ko T. e Rashkovan A. Flash-boiling Atomizations Progress in Energy and Combustion Science 34 2007
- S.-P. J. , Romunde Z. v. , Aleiferis P. , R. D. , W. S. , e C.R.F. Cavitation, primary break-up and flash boiling of gasoline, iso-octane and n-pentane with a real-size optical direct-injection nozzle Fuel 89 2592 2607 2010
- Postrioti , L. , Mariani , F. , Battistoni , M. , and Mariani , A. Experimental and Numerical Evaluation of Diesel Spray Momentum Flux SAE Int. J. Engines 2 2 287 299 2010 10.4271/2009-01-2772
- Postrioti , L. and Battistoni , M. Evaluation of Diesel Spray Momentum Flux in Transient Flow Conditions SAE Technical Paper 2010-01-2244 2010 10.4271/2010-01-2244
- Postrioti , L. , Battistoni , M. , Ungaro , C. , and Mariani , A. Analysis of Diesel Spray Momentum Flux Spatial Distribution SAE Int. J. Engines 4 1 720 736 2011 10.4271/2011-01-0682
- Payri R. , García J.M. , Salvador F.J. , Gimeno J. Using Spray Momentum Flux Measurements to Understand the Influence of Diesel Nozzle Geometry on Spray Characteristics Fuel 84 5 551 561 2005
- 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
- Desantes , J. , Payri , R. , Salvador , F. , and Gimeno , J. Prediction of Spray Penetration by Means of Spray Momentum Flux SAE Technical Paper 2006-01-1387 2006 10.4271/2006-01-1387
- Kampmann , S. , Dittus , B. , Mattes , P. , and Kirner , M. The Influence of Hydro Grinding at VCO Nozzles on the Mixture Preparation in a DI Diesel Engine SAE Technical Paper 960867 1996 10.4271/960867
- Rajaratnam N. Turbulent Jets Amsterdam Elsevier 1974
- Grimaldi C. N. , Postrioti L. 2000 Experimental Comparison between Conventional and Bio-derived Fuels Sprays from a Common Rail Injection System SAE Paper 2000-01-1252 SAE 2000 Transactions Journal of Engines, Section 3 109
- Postrioti , L. , Grimaldi , C. , Ceccobello , M. , and Di Gioia , R. Diesel Common Rail Injection System Behavior with Different Fuels SAE Technical Paper 2004-01-0029 2004 10.4271/2004-01-0029
- Postrioti , L. and Ubertini , S. An Integrated Experimental-Numerical Study of HSDI Diesel Injection System and Spray Dynamics SAE Technical Paper 2006-01-1389 2006 10.4271/2006-01-1389
- Postrioti , L. , Buitoni , G. , Pesce , F.C. , Ciaravino , C. Zeuch method-based injection rate analysis of a common-rail system operated with advanced injection strategies 2014 Fuel 128 188 198
- Soudbakhsh , D. and Eskandarian , A. A Collision Avoidance Steering Controller using Linear Quadratic Regulator SAE Technical Paper 2010-01-0459 2010 10.4271/2010-01-0459