Experimental investigation and phenomenological model development of flame kernel growth rate in a gasoline fuelled spark ignition engine

As flame kernel growth plays a major role in combustion of premixed-charge in spark ignition engines for higher energy efficiency and less emission, the experimental study was carried out on a single cylinder spark ignition research engine for measurement of flame kernel growth rate (FKGR) using spark plug fibre optics probe (VisioFlame sensor). The FKGR was measured on the engine at different power output with varied spark ignition timings and different engine speeds. The experimental results indicate that the FKGR was the highest with the maximum brake torque (MBT) spark timing and it decreases with increase in the engine speed. The FKGR at engine speed of 1000RPM was the highest of 1.81m/s with MBT timing (20°bTDC) as compared to 1.6m/s (15°bTDC), 1.67m/s (25°bTDC), and 1.61m/s (30°bTDC) with retarded and advanced timing. In addition to this, a phenomenological model was developed for calculation of FKGR. It was observed from the model that FKGR is function of equivalence ratio, engine speed, in-cylinder pressure and charge density. The experimental results and methodology emerged from this study would be useful for optimization of engine parameters using the FKGR and also further development of model for alternative fuels.

[1]  Roger Sierens,et al.  Modeling the Initial Growth of the Plasma and Flame Kernel in SI Engines , 2003 .

[2]  Hui Xie,et al.  Study on spark assisted compression ignition (SACI) combustion with positive valve overlap at medium–high load , 2013 .

[3]  Z. H Kodah,et al.  Combustion in a spark-ignition engine , 2000 .

[4]  M. Sunwoo,et al.  Flame kernel formation and propagation modelling in spark ignition engines , 2001 .

[5]  John B. Heywood,et al.  A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines , 1993 .

[6]  M. Dixit,et al.  Tata McGraw Hill Education Private Limited , 2015 .

[7]  G. Ziegler,et al.  Flow Field Effects on Flame Kernel Formation in a Spark-Ignition Engine , 1988 .

[8]  Vedat S. Arpaci,et al.  Spark ignition of propane-air mixtures near the minimum ignition energy: Part II. A model development , 1991 .

[9]  Jan Swevers,et al.  Minimization of the fuel consumption of a gasoline engine using dynamic optimization , 2009 .

[10]  P. W. Schreiber,et al.  Electrical Conductivity and Total Emission Coefficient of Air Plasma , 1973 .

[11]  C. Pera,et al.  Effects of residual burnt gas heterogeneity on early flame propagation and on cyclic variability in spark-ignited engines , 2013 .

[12]  Olivier Colin,et al.  On the use of a tabulation approach to model auto-ignition during flame propagation in SI engines , 2011 .

[13]  Fabrice Foucher,et al.  Radio frequency spark plug: An ignition system for modern internal combustion engines , 2014 .

[14]  Hong Guang Zhang,et al.  Study on the effect of engine operation parameters on cyclic combustion variations and correlation coefficient between the pressure-related parameters of a CNG engine , 2013 .

[15]  K. A. Subramanian,et al.  Study of Flame Characteristics of a Spark Ignition Engine for Gasoline Fuel , 2009 .

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

[17]  J. Heywood,et al.  How Heat Losses to the Spark Plug Electrodes Affect Flame Kernel Development in an SI-Engine , 1990 .

[18]  C. Bae,et al.  The effects of tumble and swirl flows on flame propagation in a four-valve S.I. engine , 2007 .

[19]  T. S. Morton,et al.  Estimating the mean flow field in combustion chambers , 2014 .

[20]  Eran Sher,et al.  On the birth of spark channels , 1992 .

[21]  John B. Heywood,et al.  Flame initiation in a spark-ignition engine , 1986 .

[22]  Wai K. Cheng,et al.  Flame Kernel Development in a Methanol Fueled Engine , 1993 .

[23]  C. D. Rakopoulos,et al.  Development and validation of a multi-zone combustion model for performance and nitric oxide formation in syngas fueled spark ignition engine , 2008 .

[24]  Anqi Zhang,et al.  An Experimental Study of Flame Kernel Evolution in Lean and Diluted Methane-Air Mixtures at Engine-Like Conditions , 2014 .

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

[26]  Eran Sher,et al.  A theoretical study of the ignition of a reactive medium by means of an electrical discharge , 1985 .

[27]  Asok K. Sen,et al.  Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine , 2011 .

[28]  Charles A. Amann,et al.  Cylinder-Pressure measurement and Its Use in Engine Research , 1985 .

[29]  Andrea Unich,et al.  Numerical evaluation of internal combustion spark ignition engines performance fuelled with hydrogen – Natural gas blends , 2012 .

[30]  Hameed Metghalchi,et al.  On flame kernel formation and propagation in premixed gases , 2010 .

[31]  Myung Taeck Lim,et al.  Prediction of spark kernel development in constant volume combustion , 1987 .

[32]  George Kosmadakis,et al.  Investigating the effect of crevice flow on internal combustion engines using a new simple crevice model implemented in a CFD code , 2011 .

[33]  J. P. Holman,et al.  Experimental methods for engineers , 1971 .

[34]  Rudolf Maly,et al.  A Fundamental Model for Flame Kernel Formation in S. I. Engines , 1992 .

[35]  Dennis N. Assanis,et al.  The effects of spark timing, unburned gas temperature, and negative valve overlap on the rates of stoichiometric spark assisted compression ignition combustion , 2013 .