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Study of ECN Injectors’ Behavior Repeatability with Focus on Aging Effect and Soot Fluctuations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
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The Engine Combustion Network (ECN) has become a leading group concerning the experimental and computational analysis of engine combustion phenomena. In order to establish a coherent database for model validation, all the institutions participating in the experimental effort carry out tests at well-defined boundary conditions and using wellcharacterized hardware.
In this framework, the reference Spray A injectors have produced different results even when tested in the same facility, highlighting that the nozzle employed and its fouling are important parameters to be accounted for.
On the other hand, the number of the available Spray A injectors became an issue, due to the increasing number of research centers and simultaneous experiments taking place in the ECN community.
The present work has a double aim: on the one hand, to seek for an appropriate methodology to “validate” new injectors for ECN experiments and to provide new hardware for the ECN community. On the other hand, to investigate injector characteristics reproducibility, with particular focus on the effect of injector aging and on the data scattering observed in soot measurements.
In order to investigate these issues, a set of 10 new injectors with identical nominal Spray A specifications were purchased and characterized using ECN standard diagnostics. A full characterization of the injector-set was performed including nozzle orifice diameter, rate of injection, liquid/vapor phase penetrations, ignition delay, lift-off length, and high-speed 2D soot extinction.
The results outline a global agreement with the ECN dataset, also when parametric variations are applied. These results therefore validate this injector set which can be included in the ECN injector pool. Moreover, the analysis of the discrepancies observed among the injector set highlighted their causes. The differences observed in the vapor phase penetration and in liftoff length appeared to be related to slight differences measured in the average mass flow rate. A substantial impact of the nozzle aging on the liquid length measurements was observed and quantified. The injector aging showed a first order effect on the liquid length results, in particular on the first experiments performed on a brand new injector. The most likely aging agent detected in the present work is the pre-burn event performed in the high-temperature high-pressure vessel employed for the tests. This aging effect should be taken into account for future injector validations.
Finally, the lift-off length and the soot extinction measured during a single test appeared strictly depending on each other: factor two differences in soot KL were observed to be the consequence of minimal differences in lift-off length (10-20%).
These observations, based on a high number of measurements, underline the impact of the injector singularities on the spray/combustion characteristics, even when comparing nominal identical injectors.
CitationBardi, M., Bruneaux, G., and Malbec, L., "Study of ECN Injectors’ Behavior Repeatability with Focus on Aging Effect and Soot Fluctuations," SAE Technical Paper 2016-01-0845, 2016, https://doi.org/10.4271/2016-01-0845.
- Sandia National Labs. Engine Combustion Network (ECN) http://www.sandia.gov/ecn/ January 10 2016
- Pickett , L. , Genzale , C. , Bruneaux , G. , Malbec , L. et al. Comparison of Diesel Spray Combustion in Different High-Temperature, High-Pressure Facilities SAE Int. J. Engines 3 2 156 181 2010 10.4271/2010-01-2106
- Meijer , M. , Somers , B. , Johnson , J. , Naber , J. et al. Engine Combustion Network (ECN): characterization and comparison of boundary conditions for different combustion vessels Atomization and Sprays 22 9 777 806 2012
- Bardi , M. , Payri , R. , Malbec , L.-M. , Bruneaux , G. et al. Engine Combustion Network: Comparison of Spray Development, Vaporization, and Combustion in Different Combustion Vessels Atomization and Sprays 22 10 807 842 2012
- Kastengren , A.L. , Tilocco , F.Z. , Powell , C.F. , Manin , J. et al. Engine Combustion Network (ECN): Measurements of Nozzle Geometry and Hydraulic Behavior Atomization and Sprays 22 12 1011 1052 2012
- Malbec , L. , Egúsquiza , J. , Bruneaux , G. , and Meijer , M. Characterization of a Set of ECN Spray A Injectors: Nozzle to Nozzle Variations and Effect on Spray Characteristics SAE Int. J. Engines 6 3 1642 1660 2013 10.4271/2013-24-0037
- Meijer , M. , Malbec , L.-M. , Bruneaux , G. , and Somers , L. Engine Combustion Network:‘Spray A’Basic Measurements and Advanced Diagnostics 12th Triennial International Conference on Liquid Atomization and Spray Systems (ICLASS 2012) Heidelberg, Germany 2012
- Agence Nationale Recherche ECN France http://www.agence-nationale-recherche.fr/en/anr-funded-project/?tx_lwmsuivibilan_pi2[CODE]=ANR-14-CE22-0015 October 27 2015
- Macian , V. , Bermudez , V. , Payri , R. , and Gimeno , J. New technique for determination of internal geometry of a diesel nozzle with the use of silicone methodology Experimental techniques 27 2 39 43 2003
- Pickett , L. , Manin , J. , Payri , R. , Bardi , M. et al. Transient Rate of Injection Effects on Spray Development SAE Technical Paper 2013-24-0001 2013 10.4271/2013-24-0001
- Benajes , J. , Payri , R. , Bardi , M. , and Martí-Aldaraví , P. Experimental characterization of diesel ignition and liftoff length using a single-hole injector Applied Thermal Engineering 58 1-2 554 563 2013
- Baert , R. , Frijters , P. , Somers , B. , Luijten , C. et al. Design and Operation of a High Pressure, High Temperature Cell for HD Diesel Spray Diagnostics: Guidelines and Results SAE Technical Paper 2009-01-0649 2009 10.4271/2009-01-0649
- Nesbitt , J.E. , Johnson , S.E. , Pickett , L.M. , Siebers , D.L. et al. Minor species production from lean premixed combustion and their impact on autoignition of diesel surrogates Energy & Fuels 25 3 926 936 2011
- Payri , R. , García-Oliver , J.M. , Bardi , M. , and Manin , J. Fuel temperature influence on diesel sprays in inert and reacting conditions Applied Thermal Engineering 35 185 195 2012
- Settle , G.S. Schlieren and Shadowgraph Techniques Springer-Verlag Berlin 2001
- 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
- Manin , J. , Bardi , M. , and Pickett , L.M. Evaluation of the liquid length via diffused back-illumination imaging in vaporizing diesel sprays International Symposium COMODIA 2012 2012
- Dec , J. A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging SAE Technical Paper 970873 1997 10.4271/970873
- Dec , J. and Coy , E. OH Radical Imaging in a DI Diesel Engine and the Structure of the Early Diffusion Flame SAE Technical Paper 960831 1996 10.4271/960831
- 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
- Meijer , M. , Galle , J. , Somers , L. , Griensven , J. et al. High-Speed Characterization of ECN Spray A Using Various Diagnostic Techniques SAE Int. J. Engines 6 2 1238 1248 2013 10.4271/2013-01-1616
- Manin , J. , Pickett , L. , and Skeen , S. Two-Color Diffused Back-Illumination Imaging as a Diagnostic for Time-Resolved Soot Measurements in Reacting Sprays SAE Int. J. Engines 6 4 1908 1921 2013 10.4271/2013-01-2548
- Ghandhi , J.B. and Heim , D.M. An optimized optical system for backlit imaging The Review of scientific instruments 80 5 056105 2009
- Skeen , S. A. , Manin , J. , Dalen , K. , and Pickett , L.M. Extinction-based imaging of soot processes over a range of diesel operating conditions 8th US National Combustion Meeting Salt Lake City, Utah 2013
- 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 1-2 114 135 2004
- Manin , J. , Kastengren , A. , and Payri , R. Understanding the Acoustic Oscillations Observed in the Injection Rate of a Common-Rail Direct Injection Diesel Injector Journal of Engineering for Gas Turbines and Power 134 12 122801 2012
- CMT-Motores Termicos Virtual mass flow rate generator http://www.cmt.upv.es/ECN03.aspx October 2 2015
- Pastor , J.V. , López , J.J. , García , J.M. , and Pastor , J.M. A 1D model for the description of mixing-controlled inert diesel sprays Fuel 87 13-14 2871 2885 2008
- Ricart , L.M. , Reltz , R.D. , and Dec , J.E. Comparisons of Diesel Spray Liquid Penetration and Vapor Fuel Distributions With In-Cylinder Optical Measurements Journal of Engineering for Gas Turbines and Power 122 4 588 595 1999
- Higgins , B. , Mueller , C. , and Siebers , D. Measurements of Fuel Effects on Liquid-Phase Penetration in DI Sprays SAE Technical Paper 1999-01-0519 1999 10.4271/1999-01-0519
- Pickett , L. , Siebers , D. , and Idicheria , C. Relationship Between Ignition Processes and the Lift-Off Length of Diesel Fuel Jets SAE Technical Paper 2005-01-3843 2005 10.4271/2005-01-3843