Using detailed chemical kinetics 3D-CFD model to investigate combustion phase of a CNG-HCCI engine according to control strategy requirements

Abstract Homogeneous Charge Compression Ignition (HCCI) method decline soot and NOx emission by offering high thermal efficiency in order of diesel engine. However, controlling HCCI combustion phenomena is known as the significant setback for its development. Control-oriented models use CA5, CA10, CA50 and CA90 as the most important dependent variables. Start of combustion (SOC), for instance, has already been traced via pressure rise versus crank angle. In fact, these simplifications have been progressed to reach real-time response as the main nature of controlling target. In this study, a 3D CFD model coupled with detailed chemical kinetics has been modified to devise a brief relation between these controlling parameters and what really happens in combustion chamber. The model has been validated with experimental results in four distinct conditions. To detect combustion phase, hydroxyl radical ( OH ) has been suggested as an indicator among all other chemical species due to its significant role in CNG combustion. Various sets of simulations have come up with noticeable findings that CA50 in CNG fueled HCCI engine equals crank angles when OH concentration and pressure rise rate reach their peaks. This result represents OH as a potential robust parameter in HCCI engine control even though this relation is not established well in weak combustion region rather than high heat release rate ( HHR ) cases. Finally, IMEP and BSFC, as the most important performance parameters of an engine have studied versus CA50 and OH concentration variation. The comparison proved good agreement between these two terms except in near-TDC combustion cases.

[1]  Direct Injection Assisted HCCI Combustion of Pre-mixed Natural Gas , 2008 .

[2]  Norimasa Iida,et al.  Combustion Analysis of Natural Gas in a Four Stroke HCCI Engine Using Experiment and Elementary Reactions Calculation , 2003 .

[3]  Christopher J. Rutland,et al.  A New Approach to Model DI-Diesel HCCI Combustion for Use in Cycle Simulation Studies , 2005 .

[4]  A. Rahimi,et al.  Availability analysis of n-heptane and natural gas blends combustion in HCCI engines , 2011 .

[5]  M. Birouk,et al.  Fuel suitability for homogeneous charge compression ignition combustion , 2016 .

[6]  Robert W. Dibble,et al.  Cyclic variations and prior-cycle effects of ion current sensing in an HCCI engine: A time-series analysis , 2016 .

[7]  Mingfa Yao,et al.  Progress and recent trends in homogeneous charge compression ignition (HCCI) engines , 2009 .

[8]  Han Wu,et al.  Research on Combustion Characteristics and Performances of an HCCI Engine Fuelled with Methanol , 2013 .

[9]  Song-Charng Kong,et al.  Modeling the Effects of Geometry Generated Turbulence on HCCI Engine Combustion , 2003 .

[10]  Hua Zhao,et al.  Comparison of combustion characteristics of n-butanol/ethanol-gasoline blends in a HCCI engine. , 2015 .

[11]  Zhijun Wu,et al.  Study on the phase relation between ion current signal and combustion phase in an HCCI combustion engine , 2015 .

[12]  R. H. Thring,et al.  Homogeneous-Charge Compression-Ignition (HCCI) Engines , 1989 .

[13]  F. Dryer,et al.  The Effects of NOx Addition on the Auto Ignition Behavior of Natural Gas under HCCI Conditions , 2002 .

[14]  Zunqing Zheng,et al.  Experimental and numerical study on different dual-fuel combustion modes fuelled with gasoline and diesel , 2014 .

[15]  Hewu Wang,et al.  Numerical study of hydrogen addition to DME/CH4 dual fuel RCCI engine , 2012 .

[16]  M. Birouk,et al.  Comparison study on combustion characteristics and emissions of a homogeneous charge compression ignition (HCCI) engine with and without pre-combustion chamber , 2015 .

[17]  Francisco Espinosa-Loza,et al.  Analysis of the Effect of Geometry Generated Turbulence on HCCI Combustion by Multi-Zone Modeling , 2005 .

[18]  Jerald A. Caton,et al.  Use of a single-zone thermodynamic model with detailed chemistry to study a natural gas fueled homogeneous charge compression ignition engine , 2012 .

[19]  K. Kuo Principles of combustion , 1986 .

[20]  Robert W. Dibble,et al.  A Decoupled Model of Detailed Fluid Mechanics Followed by Detailed Chemical Kinetics for Prediction of Iso-Octane HCCI Combustion , 2001 .

[21]  Takuji Ishiyama,et al.  Study on Combustion Control in Natural-Gas PCCI Engines with Ozone Addition into Intake Gas , 2006 .

[22]  R. Maurya,et al.  Numerical investigation of ethanol fuelled HCCI engine using stochastic reactor model. Part 2: Parametric study of performance and emissions characteristics using new reduced ethanol oxidation mechanism , 2016 .

[23]  Hatim Machrafi,et al.  An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine , 2008 .

[24]  Scott B. Fiveland,et al.  A Four-Stroke Homogeneous Charge Compression Ignition Engine Simulation for Combustion and Performance Studies , 2000 .

[25]  Mahdi Shahbakhti,et al.  Performance prediction of HCCI engines with oxygenated fuels using artificial neural networks , 2015 .

[26]  S. H. Jo,et al.  Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines , 1979 .

[27]  Bengt Johansson,et al.  Operation strategy of a Dual Fuel HCCI Engine with VGT , 2007 .

[28]  Seref Soylu Examination of combustion characteristics and phasing strategies of a natural gas HCCI engine , 2005 .

[29]  J.-Y. Chen,et al.  Experimental and numerical investigation of ion signals in boosted HCCI combustion using cesium and potassium acetate additives , 2016 .

[30]  Song-Charng Kong,et al.  A study of natural gas/DME combustion in HCCI engines using CFD with detailed chemical kinetics , 2007 .

[31]  M. Ishida,et al.  HC2-2: EXPERIMENTAL ANALYSIS OF THERMAL EFFICIENCY IMPROVEMENT DUE TO HIGH EGR RATIO IN HCCI ENGINES FUELLED WITH DME AND NATURAL GAS(HC: HCCI Combustion,General Session Papers) , 2008 .

[32]  Robert W. Dibble,et al.  Experimental investigation of butanol isomer combustion in Homogeneous Charge Compression Ignition (HCCI) engines , 2016 .

[33]  M. Yao,et al.  Numerical study on the chemical reaction kinetics of n-heptane for HCCI combustion process , 2006 .

[34]  Zhi Wang,et al.  A computational study of direct injection gasoline HCCI engine with secondary injection , 2006 .

[35]  Seyed Ali Jazayeri,et al.  A Comprehensive Study on Natural Gas HCCI Engine Response to Different Initial Conditions via a Thermo-Kinetic Engine Model , 2009 .

[36]  Scott B. Fiveland,et al.  Experimental and Simulated Results Detailing the Sensitivity of Natural Gas HCCI Engines to Fuel Composition , 2001 .