Evaluation of EGR techniques on a HSDI diesel engine using first law analysis

The effects of different EGR strategies on engine efficiency and the resulting energy flows at two speed/load conditions (1500 rpm/6.8 bar nIMEP and 1750 rpm/13.5 bar nIMEP) were studied using a first law analysis approach. The EGR strategies tested were: cooled high-pressure EGR (baseline), the application of EGR with the swirl flap closed and the use of EGR under constant λ conditions. The closed swirl flap EGR strategy reduced brake efficiency under high load conditions and increased heat transfer to the coolant for both load cases. Soot and CO emissions increased at high load, however with an increase in NO x relative to the baseline case. The constant λ EGR strategy reduced brake efficiency under low load, as well as the heat flow to the coolant for both load cases. The constant λ EGR strategy benefits smoke emissions and increases combustion EGR tolerance, albeit with a penalty in NO x emission.

[1]  Adam Weall,et al.  Comparing the Effect of a Swirl Flap and Asymmetric Inlet Valve Opening on a Light Duty Diesel Engine , 2017 .

[2]  Felix Leach,et al.  Comparing the Effect of Fuel/Air Interactions in a Modern High-Speed Light-Duty Diesel Engine , 2017 .

[3]  Antonio García,et al.  Evaluation of EGR Effect on the Global Energy Balance of a High Speed DI Diesel Engine , 2016 .

[4]  Martin Tuner,et al.  Experimental Comparison of Heat Losses in Stepped-Bowl and Re-Entrant Combustion Chambers in a Light Duty Diesel Engine , 2016 .

[5]  Paul C. Miles,et al.  A review of design considerations for light-duty diesel combustion systems , 2016 .

[6]  Samir Raorane,et al.  Analytical and Developmental Techniques Utilized in the Structural Optimization of a New Lightweight Diesel Engine , 2015 .

[7]  Francisco Payri,et al.  Experimental and Theoretical Analysis of the Energy Balance in a DI Diesel Engine , 2015 .

[8]  B. Duboc,et al.  The effect of fuel additives on diesel fuel delivery system and combustion performance , 2014 .

[9]  Christian Donn,et al.  Experimental Heat Flux Analysis of an Automotive Diesel Engine in Steady-State Operation and During Warm-Up , 2011 .

[10]  L. Smith,et al.  Application of a First Law Heat Balance Method to a Turbocharged Automotive Diesel Engine , 2009 .

[11]  P. Pacaud,et al.  Reduction of the Compression Ratio on a HSDI Diesel Engine : Combustion Design Evolution for Compliance the Future Emission Standards , 2008 .

[12]  Paul C. Miles,et al.  Fuel Injection and Mean Swirl Effects on Combustion and Soot Formation in Heavy Duty Diesel Engines , 2007 .

[13]  Paul C. Miles,et al.  The effect of swirl ratio and fuel injection parameters on CO emission and fuel conversion efficiency for high-dilution, low-temperature combustion in an automotive diesel engine. , 2006 .

[14]  Naeim A. Henein,et al.  Effect of Injection Pressure and Swirl Motion on Diesel Engine-out Emissions in Conventional and Advanced Combustion Regimes , 2006 .

[15]  John M. E. Storey,et al.  Simultaneous Low Engine-Out NOx and Particulate Matter with Highly Diluted Diesel Combustion , 2003 .

[16]  Shuji Kimura,et al.  Ultra - Clean Combustion Technology Combining a Low - Temperature and Premixed Combustion Concept fo , 2001 .

[17]  K. Akihama,et al.  Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature , 2001 .

[18]  J. Dec,et al.  Diffusion-Flame / Wall Interactions in a Heavy-Duty DI Diesel Engine , 2001 .

[19]  Paul C. Miles,et al.  The Influence of Swirl on HSDI Diesel Combustion at Moderate Speed and Load , 2000 .

[20]  Roland Larsson,et al.  Lubricant thermal conductivity and heat capacity under high pressure , 2000 .

[21]  Hua Zhao,et al.  The effects of exhaust gas recirculation on diesel combustion and emissions , 2000 .

[22]  Susan T. Bagley,et al.  A Study of the Effects of Exhaust Gas Recirculation on Heavy-Duty Diesel Engine Emissions , 1998 .

[23]  Zoran Filipi,et al.  FIRST AND SECOND LAW ANALYSES OF A NATURALLY ASPIRATED, MILLER CYCLE, SI ENGINE WITH LATE INTAKE VALVE CLOSURE , 1998 .

[24]  William M. Silvis,et al.  An Algorithm for Calculating the Air/Fuel Ratio from Exhaust Emissions , 1997 .

[25]  J. Naber,et al.  Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays , 1996 .

[26]  A. C. Alkidas,et al.  The Use of Availability and Energy Balances in Diesel Engines , 1989 .

[27]  A. C. Alkidas,et al.  The Distribution of Heat Rejection from a Single-Cylinder Divided-Chamber Diesel Engine , 1981 .

[28]  Donald J. Patterson,et al.  Heat Balance Provides Insight into Modern Engine Fuel Utilization , 1977 .

[29]  Giovanni Fiengo,et al.  Introduction to Internal Combustion Engines , 2013 .

[30]  P. Miles.  Turbulent Flow Structure in Direct-Injection, Swirl-Supported Diesel Engines , 2008 .

[31]  Cherian A. Idicheria,et al.  Effect of EGR on diesel premixed-burn equivalence ratio , 2007 .

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