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Visual Analyses of End of Injection Liquid Structures and the Behaviour of Nozzle Surface-Bound Fuel in a Direct Injection Diesel Engine
Technical Paper
2019-01-0059
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For efficiency, the majority of modern diesel engines implement multiple injection strategies, increasing the frequency of transient injection phases and thus, end of injection (EOI) events. Recent advances in diagnostic techniques have identified several EOI phenomena pertinent to nozzle surface wetting as a precursor for deposit formation and a potential contributor towards pollutant emissions. To investigate the underlying processes, highspeed optical measurements at the microscopic scale were performed inside a motored diesel engine under low load/idling conditions. Visualisation of the injector nozzle surface and near nozzle region permitted an indepth analysis of the post-injection phenomena and the behaviour of fuel films on the nozzle surface when the engine is not fired. Inspection of the high-speed video data enabled an interpretation of the fluid dynamics leading to surface wetting, elucidating the mechanisms of deposition and spreading. As the needle re-seated, the abrupt pressure drop inhibited atomisation. Large, slow moving, liquid structures were released into the cylinder with the capability of impinging on nearby surfaces, creating localised fuel rich regions, or escaping through the exhaust and contributing towards un-burnt hydrocarbon emissions. Large ligaments remained attached to the nozzle, with some fluid subsequently breaking away while the remaining fuel adhering the nozzle retracted back causing surface wetting. The EOI event was succeeded by further surface wetting due to the expansion of orifice-trapped gas dislodging nozzle-residing fuel that then overspilled onto the external surface. The drop in in-cylinder pressure elicited bubbling within the surface-bound fuel, further increasing the films spreading rate. The resulting bubble agglomerations collapsed in large chain reactions, projecting more fuel into the cylinder. Finally, as the intake valves closed, high velocity intake air was diverted towards the nozzle removing the remaining surface-bound fuel. As a result, a large volume of fuel was released into the combustion chamber after the EOI causing deposits on nearby surfaces or getting released through the exhaust where it would contribute towards un-burnt hydrocarbon emissions. It is likely that the anticipated increase in in-cylinder pressure and temperature if the engine was fired would either reduce the time-scale of these event or completely inhibit them. However, understanding the behaviour of the surface-bound fuel within this environment will aid designs that control surface wetting, thus inhibiting nozzle coking with the capacity to control internal deposits.
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Sykes, D., de Sercey, G., Gold, M., Pearson, R. et al., "Visual Analyses of End of Injection Liquid Structures and the Behaviour of Nozzle Surface-Bound Fuel in a Direct Injection Diesel Engine," SAE Technical Paper 2019-01-0059, 2019, https://doi.org/10.4271/2019-01-0059.Data Sets - Support Documents
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References
- Dieselnet EU Cars and Light Trucks Emission Standards EcoPoint Inc. 2017
- Rahman , M.M. , Mohammed , K.M. , and Bakar , R.A. Effects of Air-Fuel Ratio and Engine Speed on Performance of Hydrogen Fueled Port Injection Engine Journal of Applied Sciences 9 1128 1134 2009 10.3923/jas.2009.1128.1134
- Matsumoto , S. , Yamada , K. , and Date , K. Concepts and Evolution of Injector for Common Rail System SAE Technical Paper 2012-01-1753 2012 10.4271/2012-01-1753
- 2017 http://delphi.com/manufacturers/cv/powertrain/common-rail-systems/
- Barker , J. , Richards , P. , Goodwin , M. , and Wooler , J. Influence of High Injection Pressure on Diesel Fuel Stability: A Study of Resultant Deposits SAE Int. J. Fuels Lubr. 2 1 877 884 2009 10.4271/2009-01-1877
- Watkinson , A.P. and Wilson , D.I. Chemical Reaction Fouling: A Review Experimental Thermal and Fluid Science 14 361 374 1997 10.1016/S0894-1777(96)00138-0
- Birgel , A. , Ladommatos , N. , Aleiferis , P. , Milovanovic , N. et al. Investigations on Deposit Formation in the Holes of Diesel Injector Nozzles SAE Int. J. Fuels Lubr. 5 1 123 131 2011 10.4271/2011-01-1924
- Lacey , P. , Gail , S. , Kientz , J.M. , Benoist , G. et al. Fuel Quality and Diesel Injector Deposits SAE Int. J. Fuels Lubr. 5 3 1187 1198 2012 10.4271/2012-01-1693
- Caprotti , R. , Breakspear , A. , Graupner , O. , and Klaua , T. Detergency Requirements of Future Diesel Injection Systems SAE Technical Paper 2005-01-3901 2005 10.4271/2005-01-3901
- Reid , J. , Cook , S. , and Barker , J. Internal Injector Deposits from Sodium Sources SAE Int. J. Fuels Lubr. 7 2 436 444 2014 10.4271/2014-01-1388
- Barker , J. , Richard , P. , Snape , C. , and Meredith , W. Diesel Injector Deposits - An Issue that Has Evolved with Engine Technology SAE Technical Paper 2011-01-1923 2011 10.4271/2011-01-1923
- Magno , A. , Mancaruso , E. , Vaglieco , B.M. , Florio , S. et al. Study on Spray Injection and Combustion of Fouled and Cleaned Injectors by Means of 2-D Digital Imaging in a Transparent CR Diesel Engine SAE Technical Paper 2013-24-0062 2013 10.4271/2013-24-0062
- Cracknell , R. , Wardle , R. , Pos , R. , and Ganippa , L. Effect of Diesel Injector Tip Deposits on Transient Spray Behavior Internationaler Motorenkongress 2016 10.1007/978-3-658-12918-7_13
- Caprotti , R. , Bhatti , N. , and Balfour , G. Deposit Control in Modern Diesel Fuel Injection Systems SAE Int. J. Fuels Lubr. 3 2 901 915 2010 10.4271/2010-01-2250
- Rounthwaite , N.J. , Williams , R. , Mcgivery , C. , Jiang , J. et al. A Chemical and Morphological Study of Diesel Injector Nozzle Deposits - Insights into Their Formation and Growth Mechanisms SAE Int. J. Fuels Lubr. 10 1 106 114 2017 10.4271/2017-01-0798
- Tang , J. , Pischinger , S. , Lamping , M. , Krfer , T. et al. Coking Phenomena in Nozzle Orifices of Dl-Diesel Engines SAE Int. J. Fuels Lubr. 2 1 259 272 2009 10.4271/2009-01-0837
- Stepien , Z. The Reasons and Adverse Effect of Diesel Injector Deposit Formation Combustion Engines 156 20 29 2014
- Risberg , P.A. and Alfredsson , S. The Effect of Zinc and other Metal Carboxylates on Nozzle Fouling SAE Technical Paper 2016-01-0837 2016 10.4271/2016-01-0837
- Rakshit , S. High Speed Flow Simulation in Fuel Injector Nozzles 2012 https://scholarworks.umass.edu/theses/942/
- Li , D. , Kang , Y. , Ding , X. , Wang , X. et al. Effects of Nozzle Inner Surface Roughness on the Performance of Self-Resonating Cavitating Waterjets under Different Ambient Pressures Journal of Mechanical Engineering 63 92 102 2017 10.5545/sv-jme.2016. 3563
- Suh , H.K. and Lee , C.S. Effect of Cavitation in Nozzle Orifice on the Diesel Fuel Atomization Characteristics International Journal of Heat and Fluid Flow 29 1001 1009 2008 10.1016/j.ijheatfluidflow.2008.03.014
- Barker , J. , Cook , S. , and Richards , P. Sodium Contamination of Diesel Fuel, its Interaction with Fuel Additives and the Resultant Effects on Filter Plugging and Injector Fouling SAE Int. J. Fuels Lubr. 6 3 826 838 2013 10.4271/2013-01-2687
- Barsic , N.J. and Humke , A.L. Performance and Emissions Characteristics of a Naturally Aspirated Diesel Engine with Vegetable Oil Fuels SAE Technical Paper 810262 1981 10.4271/810262
- Li , D. , Kang , Y. , Wang , X. , Ding , X. et al. Effects of Nozzle Inner Surface Roughness on the Cavitation Erosion Characteristics of High Speed Submerged Jets Experimental Thermal and Fluid Science 74 444 452 2016 :10.1016/j.expthermflusci. 2016.01.009
- Koci , C.P. , Dempsey , A. , Nudd , J. , and Knier , B. Understanding Hydrocarbon Emissions in Heavy Duty Diesel Engines Combining Experimental and Computational Methods SAE Int. J. Engines 10 3 1093 1109 2017 10.4271/2017-01-0703
- Turner , J.E. , Stetsyuk , V. , Crua , C. , Pearson , R.J. et al. The Effect of Operating Conditions on Post-Injection Fuel Discharge in an Optical Engine 13th Triennial International Conference on Liquid Atomization and Spray Systems 2015 https://iclass2015.tw/index.php
- Turner , J. , Sykes , D. , Sercey , G.D. , Stetsyuk , V. et al. A Quantitative Analysis of Nozzle Surface Bound Fuel for Diesel Injectors ILASS 2017 - 28th European Conference on Liquid Atomization and Spray Systems 2017 10.4995/ILASS2017.2017.4661
- Pos , R. , Avulapati , M. , Wardle , R. , Cracknell , R. et al. Combustion of Ligaments and Droplets Expelled after the End of Injection in a Multi-Hole Diesel Injector Fuel 197 459 466 2017 10.1016/j.fuel.2017.02.048
- Crua , C. , Heikal , M.R. , and Gold , M.R. Microscopic Imaging of the Initial Stage of Diesel Spray Formation Fuel 157 140 150 2015 :10.1016/j.fuel.2015.04. 041
- Swantek , A.B. , Duke , D. , Tilocco , F.Z. , Sovis , N. et al. End of Injection, Mass Expulsion Behaviors in Single Hole Diesel Fuel Injectors ILASS Americas 26th Annual Conference on Liquid Atomization and Spray Systems 2014 http://www.ilass.org/2/index.html
- Swantek , A.B. , Kastengren , A.L. , Duke , D. , Tilocco , F.Z. et al. A Further Examination of Fuel Dribble from Single Hole Diesel Nozzles ILASS Europe 26th Annual Conference 2014 http://ilasseurope.org/events/26th-ilass-europe-2014/
- Moon , S. , Huang , W. , Li , Z. , and Wang , J. End-Of-Injection Fuel Dribble of Multi-Hole Diesel Injector: Comprehensive Investigation of Phenomenon and Discussion on Control Strategy Applied Energy 179 7 16 2016 10.1016/j.apenergy.2016.06.116
- Eagle , W.E. and Musculus , M.P.B. Cinema-Stereo Imaging of Fuel Dribble after the End of Injection in an Optical Heavy-Duty Diesel Engine Thiesel 2014 Conference on Thermo- and Fluid Dynamic Processes in Direct Injection Engines 2014 10.1177/1468087414560307
- Lockett , R. , Jeshani , M. , Makri , K. , and Price , R. An Optical Characterization of Atomization in Non-Evaporating Diesel Sprays SAE Technical Paper 2016-01-0865 2016 10.4271/2016-01-0865
- Kirsch , V. , Reddemann , M.A. , Palmer , J. , and Kneer , R. Zooming into Primary Breakup Mechanisms of High-Pressure Automotive Sprays ILASS Europe: Conference on Liquid Atomization and Spray Systems 2017 10.4995/ILASS2017.2017.4603
- Battistoni , M. , Xue , Q. , and Som , S. Large-Eddy Simulation (Les) of Spray Transients: Start and End of Injection Phenomena Oil Gas Sci. Technol. Rev. IFP Energies nouvelles 71 4 2016 10.2516/ogst/2015024
- Anantharaman , S. and Baskaran , M. A Research on Factors Affecting Nozzle Tip Temperature in Diesel Engines SAE Technical Paper 2015-01-2791 2015 10.4271/2015-01-2791
- Leuthel , R. , Pfitzner , M. , and Frobenius , M. Numerical Study of Thermal-Fluid-Interaction in a Diesel Fuel Injector SAE Technical Paper 2008-01-2760 2008 10.4271/2008-01-2760
- Sazhin , S.S. , Qubeissi , M.A. , Nasiri , R. , Gunko , V.M. et al. A Multi-Dimensional Quasi-Discrete Model for the Analysis of Diesel Fuel Droplet Heating and Evaporation Fuel 129 238 266 2014 10.1016/j.fuel.2014.03.028
- Liley , P.E. , Hewitt , G.F. , and Beaton , C.F. Physical Property Data for the Design Engineer New York Hemisphere Pub. Corp 1989
- Bonn , D. , Eggers , J. , Indekeu , J. , Meunier , J. et al. Wetting and Spreading Reviews of Modern Physics 81 739 805 2009 10.1103/RevModPhys.81.739
- Brennen , C. 44 1995 10.1017/CBO9781107338760
- Koci , C.P. , Ra , Y. , Krieger , R. , Andrie , M. et al. Multiple-Event Fuel Injection Investigations in a Highly-Dilute Diesel Low Temperature Combustion Regime SAE International Journal of Engines 2 1 837 857 2009 10.4271/2009-01-0925
- Zhu , J. , Kuti , O.A. , and Nishida , K. Effects of Injection Pressure and Ambient Gas Density on Fuel - Ambient Gas Mixing and Combustion Characteristics of D.I. Diesel Spray SAE Technical Paper 2011-01-1819 2011 10.4271/2011-01-1819