Development and validation of a quasi-dimensional combustion model for SI engines fuelled by HCNG with variable hydrogen fractions

Spark ignition engines fuelled by hydrogen enriched compressed natural gas (HCNG) have many advantages compared to traditional gasoline, diesel and natural gas engines, especially in emission control. Experimental researches have been continuously conducted to improve HCNG engine's configuration and control strategy aimed at making full use of this new fuel. With the same target, this work presents a predictive model used to simulate the working cycle of HCNG engines which is applicable for variable hydrogen blending ratios. The fundamentals of the thermodynamic model, the turbulent flame propagation model and related equation were introduced. Considering that the most important factor influencing the applicability of the model for variable hydrogen blending ratio is the laminar flame speed, the methods of how to deal with the laminar burning velocity in the model were then described in some more detail. After the determination of model constants by calibration, simulation results were compared with experimental cylinder pressure data for various hydrogen blending ratios, spark timings and equivalence ratios. The results show that simulation and experimental results match quite well except for extremely fuel lean conditions where problems of incomplete combustion become severe.

[1]  Norbert Peters,et al.  Approximations for burning velocities and markstein numbers for lean hydrocarbon and methanol flames , 1997 .

[2]  J. C. Dent,et al.  The Measurement of the Turbulence Characteristics in an Internal Combustion Engine Cylinder , 1975 .

[3]  Fabian Mauss,et al.  Analytic approximations of burning velocities and flame thicknesses of lean hydrogen, methane, ethylene, ethane, acetylene, and propane flames , 1992 .

[4]  Qi Jiao,et al.  Effect of initial pressure on laminar combustion characteristics of hydrogen enriched natural gas , 2008 .

[5]  T. N. Veziroglu,et al.  Hydrogen civilization of the future—A new conception of the IAHE , 2006 .

[6]  Giovanni Pede,et al.  Experimental tests of blends of hydrogen and natural gas in light-duty vehicles , 2008 .

[7]  Bing Liu,et al.  Combustion characteristics of a direct-injection engine fueled with natural gas–hydrogen blends under different ignition timings , 2007 .

[8]  J. M. Novak,et al.  The Prediction of Ignition Delay and Combustion Intervals for a Homogeneous Charge, Spark Ignition Engine , 1978 .

[9]  S. Verhelst,et al.  Laminar and unstable burning velocities and Markstein lengths of hydrogen–air mixtures at engine-like conditions , 2005 .

[10]  R. E. Sonntag,et al.  Introduction to Thermodynamics: Classical and Statistical , 1971 .

[11]  Jehad A. A. Yamin,et al.  Comparative study using hydrogen and gasoline as fuels: combustion duration effect , 2006 .

[12]  B. Nagalingam,et al.  Performance study using natural gas, hydrogen-supplemented natural gas and hydrogen in AVL research engine , 1983 .

[13]  J. Mulholland,et al.  On the Derivation of Global Ignition Kinetics from a Detailed Mechanism for Simple Hydrocarbon Oxidation , 1993 .

[14]  C. R. Ferguson,et al.  A Turbulent Entrainment Model for Spark-Ignition Engine Combustion , 1977 .

[15]  Mohand Tazerout,et al.  Combustion characterization of natural gas in a lean burn spark-ignition engine , 1999 .

[16]  Fanhua Ma,et al.  Study on the extension of lean operation limit through hydrogen enrichment in a natural gas spark-ignition engine , 2008 .

[17]  R. Sierens,et al.  Variable composition hydrogen/natural gas mixtures for increased engine efficiency and decreased emissions , 2000 .

[18]  F. Halter,et al.  Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane–hydrogen–air mixtures , 2005 .

[19]  C R Stone,et al.  Measurement and Modelling of Ignition System Energy and its Effect on Engine Performance , 1989 .

[20]  S. O. Bade Shrestha,et al.  A PREDICTIVE MODEL FOR GAS FUELED SPARK IGNITION ENGINE APPLICATIONS , 1999 .

[21]  S. Wahiduzzaman,et al.  Comparison of Measured and Predicted Combustion Characteristics of a Four-Valve S.I. Engine , 1993 .

[22]  Philip John Bowen,et al.  Laminar-burning velocities of hydrogen-air and hydrogen-methane-air mixtures : An experimental study , 2006 .

[23]  Ferenc Hamori,et al.  Exploring the limits of hydrogen assisted jet ignition , 2006 .

[24]  Zuo-hua Huang,et al.  Measurements of laminar burning velocities for natural gas–hydrogen–air mixtures , 2006 .

[25]  P. G. Hill,et al.  The structure of small-scale turbulence and its effect on combustion in spark ignition engines , 1987 .

[26]  Roger Sierens,et al.  A quasi-dimensional model for the power cycle of a hydrogen-fuelled ICE , 2007 .

[27]  J. R. Smith.  Turbulent Flame Structure in a Homogeneous-Charge Engine , 1982 .

[28]  Alexander A. Konnov,et al.  Effects of hydrogen enrichment on adiabatic burning velocity and NO formation in methane + air flames , 2007 .

[29]  A. Di Benedetto,et al.  Laminar burning velocity of hydrogen-methane/air premixed flames , 2007 .

[30]  Ben Shannon,et al.  Further refinement and validation of a turbulent flame propagation model for spark-ignition engines , 1980 .

[31]  Kirk Collier,et al.  Experimental study of a clean burning vehicle fuel , 1995 .

[32]  Yong Li,et al.  Experimental study on thermal efficiency and emission characteristics of a lean burn hydrogen enriched natural gas engine , 2007 .

[33]  P. G. Hill,et al.  Tests of Thick Flame Combustion Estimates in a Single-Cylinder Engine , 1987 .

[34]  Zuo-hua Huang,et al.  Measurements of Markstein Numbers and Laminar Burning Velocities for Natural Gas-Air Mixtures , 2004 .

[35]  G. Woschni.  A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine , 1967 .

[36]  Yong Li,et al.  Effects of hydrogen addition on cycle-by-cycle variations in a lean burn natural gas spark-ignition engine , 2008 .

[37]  N. Kahraman,et al.  Internal combustion engines fueled by natural gas—hydrogen mixtures , 2004 .

[38]  James C. Keck,et al.  EXPERIMENTAL AND THEORETICAL INVESTIGATION OF TURBULENT BURNING MODEL FOR INTERNAL COMBUSTION ENGINES , 1974 .

[39]  M. T. Overington.  Combustion in Spark-ignition Engines , 1990 .

[40]  G. H. Abd Alla.  Computer simulation of a four stroke spark ignition engine , 2002 .

[41]  J. Ramos.  Internal combustion engine modeling , 1989 .