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Effects of Low Temperature Reforming (LTR) Products of Low Octane Number Fuels on HCCI Combustion
Technical Paper
2018-01-1682
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to achieve high-efficiency and clean combustion in HCCI engines, combustion must be controlled reasonably. A great variety of species with various reactivities can be produced through low temperature oxidation of fuels, which offers possible solutions to the problem of controlling in-cylinder mixture reactivity to accommodate changes in the operating conditions. In this work, in-cylinder combustion characteristics with low temperature reforming (LTR) were investigated in an optical engine fueled with low octane number fuel. LTR was achieved through low temperature oxidation of fuels in a reformer (flow reactor), and then LTR products (oxidation products) were fed into the engine to alter the charge reactivity. Primary Reference Fuels (blended fuel of n-heptane and iso-octane, PRFs) are often used to investigate the effects of octane number on combustion characteristics in engines. Then PRF0 (n-heptane) and PRF50 (mixture of 50% n-heptane and 50% iso-octane by volume) were chosen as representative low octane number fuels. LTR products were quantitatively detected using online gas chromatograph (GC). High-speed imaging was conducted to illustrate the flame development. A single-zone model was used to evaluate the reactivity of LTR products. The GC measurements indicate that PRF0 and PRF50 cannot chemically react at low reformer temperature of 423 K. When the reformer temperature rises up to 523 K, LTR products mainly include hydrogen, carbon monoxides, aldehydes, alcohols, ketones, alkanes, olefins and alkynes. Due to the higher fuel reactivity, PRF0 produces more reformates than PRF50. According to the experimental engine analysis, the ignition timing is retarded significantly via LTR for both PRFs. The ignition timing difference of PRF0 due to LTR is larger than PRF50. The high-speed images reveal that LTR can lead to a slower flame development. Soot formation persists because of in-cylinder inhomogeneities, and can be lowered by LTR. The reactivity evaluation using the chemical modeling approach manifests that for PRF0 most of the LTR products inhibit mixture reactivity, while there is a large increase in the species enhancing reactivity for PRF50. The impacts of LTR products on ignition depend on both the chemical structure and the concentration in the mixture. The concentration of individual LTR product usually changes along with the reforming conditions. Thus LTR has the potential to control autoignition flexibly in HCCI engines.
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Geng, C., Liu, H., Fang, X., Yang, Z. et al., "Effects of Low Temperature Reforming (LTR) Products of Low Octane Number Fuels on HCCI Combustion," SAE Technical Paper 2018-01-1682, 2018, https://doi.org/10.4271/2018-01-1682.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 Prog Energy Combust Sci 46 12 71 2015
- Yao , M. , Zheng , Z. , and Liu , H. Progress and Recent Trends in Homogeneous Charge Compression Ignition (HCCI) Engines Prog Energy Combust Sci 35 5 398 437 2009
- Agarwal , A.K. , Singh , A.P. , and Maurya , R.K. Evolution, Challenges and Path Forward for Low Temperature Combustion Engines Prog Energy Combust Sci 61 1 56 2017
- Shudo , T. Ignition Control in the HCCI Combustion Engine System Fuelled with Methanol-Reformed Gases Journal of KONES Internal Combustion Engines 12 233 244 2005
- Shudo , T. and Yamada , H. Hydrogen as an Ignition-Controlling Agent for HCCI Combustion Engine by Suppressing the Low-Temperature Oxidation Int. J. Hydrogen Energy 32 3066 3072 2007
- Tsolakis , A. , Megaritis , A. , and Yap , D. Application of Exhaust Gas Fuel Reforming in Diesel and Homogeneous Charge Compression Ignition (HCCI) Engines Fuelled with Biofuels Energy 33 462 470 2008
- Yap , D. , Peucheret , S.M. , Megaritis , A. , Wyszynski , M.L. et al. Natural Gas HCCI Engine Operation with Exhaust Gas Fuel Reforming Int. J. Hydrogen Energy 31 587 595 2006
- Voshtani , S. , Reyhanian , M. , Ehteram , M. et al. Investigating Various Effects of Reformer Gas Enrichment on a Natural Gas-Fueled HCCI Combustion Engine Int. J. Hydrogen Energy 39 19799 19809 2014
- Neshat , E. , Khoshbakhti , S.R. , and Parsa , S. Numerical Analysis of the Effects of Reformer Gas on Supercharged n-Heptane HCCI Combustion Fuel 200 488 498 2017
- Reyhanian , M. and Hosseini , V. Various Effects of Reformer Gas Enrichment on Natural-Gas, Iso-Octane and Normal-Heptane HCCI Combustion Using Artificial Inert Species Method Energy Convers Manage 159 7 19 2018
- Peucheret , S. , Feaviour , M. , and Golunski , S. Exhaust-Gas Reforming Using Precious Metal Catalysts Appl. Catal. B 65 201 206 2006
- Gomes , S.R. , Bion , N. , Blanchard , G. et al. Thermodynamic and Experimental Studies of Catalytic Reforming of Exhaust Gas Recirculation in Gasoline Engines Appl. Catal. B 102 44 53 2011
- Zhu , L. , He , Z. , Xu , Z. et al. In-Cylinder Thermochemical Fuel Reforming (TFR) in a Spark-Ignition Proc. Combust. Inst. 36 3487 3497 2017
- Herbinet , O. , Husson , B. , Serinyel , Z. et al. Experimental and Modeling Investigation of the Low-Temperature Oxidation of n-Heptane Combust. Flame 159 3455 3471 2012
- Lenhert , D.B. , Miller , D.L. , Cernansky , N.P. et al. The Oxidation of a Gasoline Surrogate in the Negative Temperature Coefficient Region Combust. Flame 156 549 564 2009
- Chen , B. , Liu , X. , Liu , H. et al. Soot Reduction Effects of the Addition of Four Butanol Isomers on Partially Premixed Flames of Diesel Surrogates Combust. Flame 177 123 136 2017
- Liu , H. , Zhang , P. , Liu , X. et al. Laser Diagnostics and Chemical Kinetic Analysis of PAHs and Soot in Co-Flow Partially Premixed Flames Using Diesel Surrogate and Oxygenated Additives of n-Butanol and DMF Combust. Flame 188 129 141 2018
- National Institute of Standards and Technology NIST Chemistry WebBook http://webbook.nist.gov/chemistry/
- Tang , Q. , Liu , H. , and Yao , M. Simultaneous Measurement of Natural Flame Luminosity and Emission Spectra in a RCCI Engine under Different Fuel Stratification Degrees SAE Technical Paper 2017-01-0714 2017 10.4271/2017-01-0714
- Dec , J.E. and Espey , C. Chemiluminescence Imaging of Auto-Ignition in a DI Diesel Engine SAE Technical Paper 982685 1998 10.4271/982685
- Dec , J.E. , Hwang , W. , and Sjöberg , M. An Investigation of Thermal Stratification in HCCI Engines Using Chemiluminescence Imaging SAE Technical Paper 2006-01-1518 2006 10.4271/2006-01-1518
- Tang , Q. , Liu , H. , Li , M. et al. Optical Study of Spray-Wall Impingement Impact on Early-Injection Gasoline Partially Premixed Combustion at Low Engine Load Applied Energy 185 708 719 2017
- Wu , H. , Wang , R. , Ou , D. et al. Reduction of Smoke and Nitrogen Oxides of a Partial HCCI Engine Using Premixed Gasoline and Ethanol with Air Appl Energy 88 3882 3890 2011
- Zhang , C. , Pan , J. , Tong , J. et al. Effects of Intake Temperature and Excessive Air Coefficient on Combustion Characteristics and Emissions of HCCI Combustion Proc Environ Sci 11 1119 1127 2011
- Bendu , H. and Murugan , S. Homogeneous Charge Compression Ignition (HCCI) Combustion: Mixture Preparation and Control Strategies in Diesel Engines Renewable and Sustainable Energy Reviews 38 732 746 2014
- Xie , H. , Lu , J. , Chen , T. et al. Chemical Effects of the Incomplete-Oxidation Products in Residual Gas on the Gasoline HCCI Auto-Ignition Combust. Sci. Technol. 186 273 296 2014
- Wolk , B. , Ekoto , I. , Northrop , W.F. et al. Detailed Speciation and Reactivity Characterization of Fuel-Specific In-Cylinder Reforming Products and the Associated Impact on Engine Performance Fuel 185 348 361 2016
- Kee , R.J. , Rupley , F.M. , and Miller , J.A. 1989
- Lawrence Livermore National Laboratory Gasoline Surrogate, D.M. https://combustion.llnl.gov/mechanisms/surrogates/gasoline-surrogate
- Mehl , M. , Pitz , W. , Sjöberg , M. et al. Detailed Kinetic Modeling of Low-Temperature Heat Release for PRF Fuels in an HCCI Engine SAE Technical Paper 2009-01-1806 2009 10.4271/2009-01-1806
- Mehl , M. , Pitz , W. , Westbrook , C. et al. Autoignition Behavior of Unsaturated Hydrocarbons in the Low and High Temperature Regions Proc. Combust. Inst. 33 201 208 2011
- Mehl , M. , Pitz , W. , Westbrook , C. et al. Kinetic Modeling of Gasoline Surrogate Components and Mixtures under Engine Conditions Proc. Combust. Inst. 3 193 200 2011
- Heywood , J.B. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988 678 680