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Numerical Study of the Effect of Injection Strategy and Compression Ratio on Gasoline/Diesel Fueled RCCI Engine
Technical Paper
2018-32-0017
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
RCCI engine is proven to have better combustion control and to produce very low NOx and soot emissions. However, its operations is limited by HRR and PPRR as well as weak combustion efficiency which results in high levels of HC and CO emissions. Engine geometry and operation parameter such as injection strategy and compression ratio can affect the reactivity of fuels in cylinders as well as the gas temperature increase rate which are the important factors in controlling RCCI combustion. Injection strategies such as single and double injections have been previously studied but the effects are still unpredictable and the effects of compression ratio towards combustion characteristic and emissions require further analysis. This work deploys a 3D computational fluid dynamic (CFD) combustion model to study the effects on combustion characteristic and emissions with respect to single injection, double injection strategy and compression ratio. The model is validated by comparing the simulation result with a previous experimental work. The results show that double injections can produce more extensive combustion propagation than single injection. This is because the second injection of diesel fuel which is more reactive creates steeper reactivity gradient and equivalence ratio gradient throughout the combustion chamber. This also results in lower NOx, soot, HC and CO compare to single injection strategy. Single injection strategy combustion depends on the reactivity gradient and equivalence ratio gradient of injected diesel fuel which need to be at the right levels or else the combustion propagation will be retarded. The study then shifted to study the effect of compression ratio on the best parameter of double injection strategy. The results show that the increase of compression ratio can further reduce soot, HC and CO to a very low level while NOx is observed to increase. Lowering compression ratio results in worsening HC and CO emission due to incomplete combustion of gasoline, The incomplete combustion is likely to be caused by low gas temperature increase rate.
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Azmi, M., Mansor, M., Wan Mahmood, W., and Mohamad, T., "Numerical Study of the Effect of Injection Strategy and Compression Ratio on Gasoline/Diesel Fueled RCCI Engine," SAE Technical Paper 2018-32-0017, 2018, https://doi.org/10.4271/2018-32-0017.Data Sets - Support Documents
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References
- Reitz , R.D. and Duraisamy , G. Review of High Efficiency and Clean Reactivity Controlled Compression Ignition (RCCI) Combustion in Internal Combustion Engines Progress in Energy and Combustion Science 46 12 71 2015
- Paykani , A. et al. Progress and Recent Trends in Reactivity-Controlled Compression Ignition Engines International Journal of Engine Research 17 5 481 524 2015
- Aoyama , T. et al. An Experimental Study on Premixed-Charge Compression Ignition Gasoline Engine SAE Technical Paper 960081 1996 10.4271/960081
- Li , J. , Yang , W. , and Zhou , D. Review on the Management of RCCI Engines Renewable and Sustainable Energy Reviews 69 65 79 2017
- Eichmeier , J.U. , Reitz , R. , and Rutland , C. A Zero-Dimensional Phenomenological Model for RCCI Combustion Using Reaction Kinetics SAE Int. J. Engines 7 1 106 119 2014 10.4271/2014-01-1074
- Jia , Z. and Denbratt , I. Experimental Investigation of Natural Gas-Diesel Dual-Fuel RCCI in a Heavy-Duty Engine SAE Int. J. Engines 8 2 797 807 2015 10.4271/2015-01-0838
- Li , J. et al. Numerical Investigation on the Effect of Reactivity Gradient in an RCCI Engine Fueled with Gasoline and Diesel Energy Conversion and Management 92 342 352 2015
- Li , J. et al. Study on RCCI (Reactivity Controlled Compression Ignition) Engine by Means of Statistical Experimental Design Energy 78 777 787 2014
- Wu , Y. and Reitz , R.D. Effects of Exhaust Gas Recirculation and Boost Pressure on Reactivity Controlled Compression Ignition Engine at High Load Operating Conditions Journal of Energy Resources Technology 137 3 032210 032210-8 2015
- Yu , C. et al. Research on Low Temperature Combustion of Homogeneous Charge Induced Ignition (HCII) in a Light-Duty Diesel Engine Berlin, Heidelberg Springer 2013
- Burton , J.L. et al. Investigation of Transient Emissions and Mixed Mode Combustion for a Light Duty Diesel Engine SAE Technical Paper 2009-01-1347 2009 10.4271/2009-01-1347
- Molina , S. et al. Operating Range Extension of RCCI Combustion Concept from Low to Full Load in a Heavy-Duty Engine Applied Energy 143 211 227 2015
- Hanson , R. et al. An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine SAE Int. J. Engines 3 1 700 716 2010
- Benajes , J. et al. A RCCI Operational Limits Assessment in a Medium Duty Compression Ignition Engine Using an Adapted Compression Ratio Energy Conversion and Management 126 497 508 2016
- Nazemi , M. and Shahbakhti , M. Modeling and Analysis of Fuel Injection Parameters for Combustion and Performance of an RCCI Engine Applied Energy 165 135 150 2016
- Richards , K.J. , Senecal , P.K. , and Pomraning , E. Theory Manual V2.2.0 Madison, WI Convergent Science, Inc. 2014
- Wang , H. , Yao , M. , and Reitz , R.D. Development of a Reduced Primary Reference Fuel Mechanism for Internal Combustion Engine Combustion Simulations Energy & Fuels 27 12 7843 7853 2013
- Li , J. , Yang , W.M. , and Zhou , D.Z. Modeling Study on the Effect of Piston Bowl Geometries in a Gasoline/Biodiesel Fueled RCCI Engine at High Speed Energy Conversion and Management 112 359 368 2016
- Curran , S.J. , Hanson , R.M. , and Wagner , R.M. Reactivity Controlled Compression Ignition Combustion on a Multi-Cylinder Light-Duty Diesel Engine International Journal of Engine Research 13 3 216 225 2012
- Leermakers , C. et al. Gasoline-Diesel Dual Fuel Effect of Injection Timing and Fuel Balance SAE Technical Paper 2011-01-2437 2011 10.4271/2011-01-2437
- Splitter , D. , Hanson , R. , Kokjohn , S. , Wissink , M. et al. Injection Effects in Low Load RCCI Dual-Fuel Combustion SAE Technical Paper 2011-24-0047 2011 10.4271/2011-24-0047