CFD Investigation into Diesel PCCI Combustion with Optimized Fuel Injection

A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection velocity were examined. The mixing process and formation of soot and nitrogen oxide (NOx) emissions were investigated as the focus of the research. The results show that the fuel splitting proportion and the injection timing impacted the combustion and emissions significantly due to the considerable changes of the mixing process and fuel distribution in the cylinder. While the spray, inclusion angle and injection velocity at the injector exit, can be adjusted to improve mixing, combustion and emissions, appropriate injection timing and fuel splitting proportion must be jointly considered for optimum combustion performance.

[1]  Rolf D. Reitz,et al.  A Computational Investigation of Two-Stage Combustion in a Light-Duty Engine , 2008 .

[2]  Hiroshi Sono,et al.  PCCI Operation with Early Injection of Conventional Diesel Fuel , 2005 .

[3]  R. Reitz,et al.  A temperature wall function formulation for variable-density turbulent flows with application to engine convective heat transfer modeling , 1997 .

[4]  A. A. Amsden,et al.  KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves , 1997 .

[5]  Kazutoshi Mori,et al.  Premixed Compression Ignition (PCI) Combustion for Simultaneous Reduction of NOx and Soot in Diesel Engine , 2004 .

[6]  Russell P. Durrett,et al.  Multiple-Event Fuel Injection Investigations in a Highly-Dilute Diesel Low Temperature Combustion Regime , 2009 .

[7]  Dennis N. Assanis,et al.  Evaluation of a Narrow Spray Cone Angle, Advanced Injection Timing Strategy to Achieve Partially Premixed Compression Ignition Combustion in a Diesel Engine , 2005 .

[8]  R. Reitz,et al.  Turbulence Modeling of Internal Combustion Engines Using RNG κ-ε Models , 1995 .

[9]  Robert J. Kee,et al.  CHEMKIN-III: A FORTRAN chemical kinetics package for the analysis of gas-phase chemical and plasma kinetics , 1996 .

[10]  M. Xie,et al.  Numerical investigation of soot reduction potentials with diesel homogeneous charge compression ignition combustion by an improved phenomenological soot model , 2009 .

[11]  Dennis N. Assanis,et al.  LEAN AND RICH PREMIXED COMPRESSION IGNITION COMBUSTION IN A LIGHT-DUTY DIESEL ENGINE , 2005 .

[12]  P. Nordin.  Complex Chemistry Modeling of Diesel Spray Combustion , 2001 .

[13]  Rolf D. Reitz,et al.  An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations , 2008 .

[14]  Rolf D. Reitz,et al.  Spray Targeting to Minimize Soot and CO Formation in Premixed Charge Compression Ignition (PCCI) Combustion with a HSDI Diesel Engine , 2006 .

[15]  R. Reitz,et al.  Development and Validation of a Reduced Reaction Mechanism for HCCI Engine Simulations , 2004 .

[16]  John E. Dec,et al.  Comparisons of diesel spray liquid penetration and vapor fuel distributions with in-cylinder optical measurements , 2000 .

[17]  Zhiyu Han,et al.  Spray/wall interaction models for multidimensional engine simulation , 2000 .

[18]  Takeyuki Kamimoto,et al.  High Combustion Temperature for the Reduction of Particulate in Diesel Engines , 1988 .

[19]  Nam-Hyo Cho,et al.  Effect of air motion on fuel spray characteristics in a gasoline direct injection engine , 1999 .