Combustion process investigations in an optically accessible DISI engine fuelled with n-butanol during part load operation

The effect of n-butanol on the combustion process in a DISI engine was investigated through in-cylinder pressure measurements and optical data. An optical engine was equipped with a commercial head and with high pressure wall guided injection system. 2000 rpm engine speed was chosen as representative for mid-road load automotive use. Two partially open throttle conditions were tested. All trials were performed at close to stoichiometric air–fuel ratio. Optical diagnostics based on UV–visible imaging and natural emission spectroscopy were applied to study the combustion process from spark ignition to exhaust valve opening. A custom post-detection procedure applied to digital imaging data allowed evaluating the flame area. Results were correlated with volume fraction burned obtained through thermodynamic analysis. UV–visible spectroscopy was applied to investigate formation and evolution of the main chemical compounds characterizing spark ignition and combustion processes. Pollutant measurements (HC, CO, NOx, opacity) at undiluted exhaust, for gasoline and butanol, were correlated with pressure data and in-cylinder optical results. Overall engine operation was found to be similar for both energy sources, with the alternative fuel providing a slight improvement in performance compared to gasoline, for both loads; a significant reduction of NOx and soot was also obtained for alcohol fuelling.

[1]  Agus Zainal Arifin,et al.  Image segmentation by histogram thresholding using hierarchical cluster analysis , 2006, Pattern Recognit. Lett..

[2]  S. Toby,et al.  Reaction of carbon monoxide with ozone: Kinetics and chemiluminescence , 1980 .

[3]  Joachim Demuynck,et al.  The potential of methanol as a fuel for flex-fuel and dedicated spark-ignition engines , 2013 .

[4]  S. Merola,et al.  Analysis of exhausts emitted by i.c. engines and stationary burners, by means of u.v. extinction and fluorescence spectroscopy. , 2001, Chemosphere.

[5]  K. Berglund,et al.  Techno-economics of carbon preserving butanol production using a combined fermentative and catalytic approach. , 2014, Bioresource technology.

[6]  C. Alkemade,et al.  Fundamentals of Analytical Flame Spectroscopy , 1979 .

[7]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[8]  Mustafa Canakci,et al.  Impact of alcohol-gasoline fuel blends on the exhaust emission of an SI engine , 2013 .

[9]  Marshall B. Long,et al.  Experimental and computational study of CH, CH*, and OH* in an axisymmetric laminar diffusion flame , 1998 .

[10]  S. Merola,et al.  Particle and nanoparticle characterization at the exhaust of internal combustion engines , 2008 .

[11]  N. Otsu.  A threshold selection method from gray level histograms , 1979 .

[12]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[13]  Soon H. Kwon,et al.  Threshold selection based on cluster analysis , 2004, Pattern Recognit. Lett..

[14]  C. Law,et al.  An experimental and mechanistic study on the laminar flame speed, Markstein length and flame chemistry of the butanol isomers , 2013 .

[15]  C. Laux,et al.  Nonequilibrium discharges in air and nitrogen plasmas at atmospheric pressure , 2002 .

[16]  S. Merola,et al.  In-Cylinder Spectroscopic Measurements of Combustion Process in a SI Engine Fuelled with Butanol-Gasoline Blend , 2013 .

[17]  H. M. Crosswhite,et al.  The ultraviolet bands of OH Fundamental data , 1962 .

[18]  D. Crosley,et al.  Transition probabilities in the A 2Σ+−X 2Πi electronic system of OH , 1998 .

[19]  Adrian Irimescu,et al.  Compression ratio and blow-by rates estimation based on motored pressure trace analysis for an optical spark ignition engine , 2013 .

[20]  E. Hawkes,et al.  Effect of Ethanol Port-Fuel-Injector Position on Dual-Fuel Combustion in an Automotive-Size Diesel Engine , 2014 .

[21]  Zhen-Hong Fang.  Liquid, Gaseous and Solid Biofuels - Conversion Techniques , 2013 .

[22]  Hao Chen,et al.  Effect of diethyl ether and ethanol additives on the combustion and emission characteristics of biodiesel-diesel blended fuel engine. , 2011 .

[23]  P. Pages,et al.  The Band Spectrum of N2 , 1982 .

[24]  Zuo-hua Huang,et al.  Emission characteristics of a spark-ignition engine fuelled with gasoline-n-butanol blends in combination with EGR , 2012 .

[25]  F. Halter,et al.  Comparison of regulated and non-regulated pollutants with iso-octane/butanol and iso-octane/ethanol blends in a port-fuel injection Spark-Ignition engine , 2012 .

[26]  F. Lacas,et al.  Closed-loop equivalence ratio control of premixed combustors using spectrally resolved chemiluminescence measurements , 2002 .

[27]  K. Fukui,et al.  Formation of the NH(A3.PI., c1.PI.) radicals by electron impact near threshold , 1977 .

[28]  B. Thrush,et al.  Mechanism of chemiluminescent combination reactions involving oxygen atoms , 1962, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[29]  D. Crosley,et al.  ELECTRONIC TRANSITION MOMENT AND ROTATIONAL MOMENT AND ROTATIONAL TRANSITION PROBABILITIES IN CH. II. B2SIGMA --X 2PI SYSTEM , 1996 .

[30]  R. Jones,et al.  The Ultraviolet Absorption Spectra of Aromatic Hydrocarbons. , 1943 .

[32]  K. Okai,et al.  Combined laser induced ignition and plasma spectroscopy: Fundamentals and application to a hydrogen–air combustor ☆ , 2007 .

[33]  L. Gary,et al.  ABELL F. Dereck, Defining The Business. The Starting Point of Strategic Planning . USA, Prentice Hall, Englewood Cliffs, New Jersey, 1980. , 1996 .

[34]  A. G. Gaydon,et al.  The identification of molecular spectra , 1950 .

[35]  Emiliano Pipitone,et al.  An Analytical Approach for the Evaluation of the Optimal Combustion Phase in Spark Ignition Engines , 2010 .

[36]  J. H. Scanlon,et al.  Calculation of CO(X1Σ+) + 0(3P) recombination chemiluminescence spectrum , 1986 .

[37]  M. J. Cinelli,et al.  Reactivity of methane in a nitrogen discharge afterglow , 2002 .

[38]  N. Selçuk,et al.  Determination of soot temperature, volume fraction and refractive index from flame emission spectrometry , 2007 .

[39]  Qingsong Yu,et al.  An Optical Emission Study on Expanding Low-Temperature Cascade Arc Plasmas , 1998 .

[40]  S. Pellerin,et al.  N2+/N2 ratio and temperature measurements based on the first negative N2+ and second positive N2 overlapped molecular emission spectra , 2004 .

[41]  P. Aleiferis,et al.  Characterisation of flame development with ethanol, butanol, iso-octane, gasoline and methane in a direct-injection spark-ignition engine , 2013 .

[42]  Yakup Sekmen,et al.  The effects of ethanol―unleaded gasoline blends on engine performance and exhaust emissions in a spark-ignition engine , 2009 .

[43]  C. D. Rakopoulos,et al.  Exhaust emissions with ethanol or n-butanol diesel fuel blends during transient operation: A review , 2013 .

[44]  James S. Wallace,et al.  Spark Spectroscopy for Spark Ignition Engine Diagnostics , 1995 .

[45]  Chao Jin,et al.  Progress in the production and application of n-butanol as a biofuel , 2011 .

[46]  Jerry Seitzman,et al.  CH∗ chemiluminescence modeling for combustion diagnostics , 2009 .

[47]  L. Ntziachristos,et al.  Review of motor vehicle particulate emissions sampling and measurement: From smoke and filter mass to particle number , 2014 .

[48]  A. Ramesh,et al.  Effective utilisation of butanol along with gasoline in a spark ignition engine through a dual injection system , 2013 .

[49]  D. Hulwan,et al.  Performance, emission and combustion characteristic of a multicylinder DI diesel engine running on diesel–ethanol–biodiesel blends of high ethanol content , 2011 .

[50]  Jianquan Luo,et al.  Efficient production of acetone-butanol-ethanol (ABE) from cassava by a fermentation-pervaporation coupled process. , 2014, Bioresource technology.

[51]  S. Szwaja,et al.  Combustion of n-butanol in a spark-ignition IC engine , 2010 .

[52]  Gerardo Valentino,et al.  Optical diagnostics of the combustion process in a PFI SI boosted engine fueled with butanol–gasoline blend , 2012 .

[53]  D. Veynante,et al.  Stabilization of a Turbulent Premixed Flame Using a Nanosecond Repetitively Pulsed Plasma , 2006, IEEE Transactions on Plasma Science.

[54]  L. Verstraete,et al.  The visible and ultraviolet absorption of large polycyclic aromatic hydrocarbons , 1992 .

[55]  Gerardo Valentino,et al.  Combustion process investigation in a high speed diesel engine fuelled with n-butanol diesel blend by conventional methods and optical diagnostics , 2014 .

[56]  A. G. Gaydon.  The spectroscopy of flames , 1957 .

[57]  Haji Hassan Masjuki,et al.  Effect of ethanol–gasoline blend on NOx emission in SI engine , 2013 .

[58]  Yannis Hardalupas,et al.  Effect of fuel type on equivalence ratio measurements using chemiluminescence in premixed flames , 2010 .

[59]  S. Madronich,et al.  Visible‐ultraviolet absorption cross sections for NO2 as a function of temperature , 1988 .

[60]  F. Halter,et al.  Experimental determination of laminar burning velocity for butanol and ethanol iso-octane blends , 2011 .

[61]  G. Guelachvili,et al.  Extensive analysis of the red system of the CN molecule with a high resolution Fourier Spectrometer , 1978 .

[62]  H. M. Crosswhite,et al.  THE ULTRAVIOLET BANDS OF OH , 1975 .

[63]  Nasib Qureshi,et al.  Bioconversion of barley straw and corn stover to butanol (a biofuel) in integrated fermentation and simultaneous product recovery bioreactors , 2014 .

[64]  G. A. Diamandis,et al.  On the stability of the classical vacua in a minimal SU(5) five-dimensional supergravity model , 2001, hep-th/0111046.

[65]  Dimitrios C. Rakopoulos,et al.  Investigation of the combustion of neat cottonseed oil or its neat bio-diesel in a HSDI diesel engine by experimental heat release and statistical analyses , 2010 .

[66]  V. Soloiu,et al.  PFI (port fuel injection) of n-butanol and direct injection of biodiesel to attain LTC (low-temperature combustion) for low-emissions idling in a compression engine , 2013 .

[67]  A. G. Gaydon,et al.  Mechanism of formation of CH, C2, OH and HCO radicals in flames , 1953 .

[68]  C. D. Rakopoulos,et al.  Influence of properties of various common bio-fuels on the combustion and emission characteristics of high-speed DI (direct injection) diesel engine: Vegetable oil, bio-diesel, ethanol, n-butanol, diethyl ether , 2014 .

[69]  Dimitrios C. Kyritsis,et al.  The combustion of n-butanol/diesel fuel blends and its cyclic variability in a direct injection diesel engine , 2011 .