Modeling the effects of EGR and injection pressure on soot formation in a High-Speed Direct-Injection (HSDI) diesel engine using a multi-step phenomenological soot model.

Conference · Sat Jan 01 04:00:00 EST 2005

OSTI ID:943909

Reitz, Rolf D ^[1]; Choi, Dae; Liu, Yi ^[1]; RempleEwert, Bret H ^[1]; Foster, David ^[1]; Miles, Paul; Tao, Feng ^[1]

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1. University of Wisconsin

Low-temperature combustion concepts that utilize cooled EGR, early/retarded injection, high swirl ratios, and modest compression ratios have recently received considerable attention. To understand the combustion and, in particular, the soot formation process under these operating conditions, a modeling study was carried out using the KIVA-3V code with an improved phenomenological soot model. This multi-step soot model includes particle inception, surface growth, surface oxidation, and particle coagulation. Additional models include a piston-ring crevice model, the KH/RT spray breakup model, a droplet wall impingement model, a wall heat transfer model, and the RNG k-{var_epsilon} turbulence model. The Shell model was used to simulate the ignition process, and a laminar-and-turbulent characteristic time combustion model was used for the post-ignition combustion process. A low-load (IMEP=3 bar) operating condition was considered and the predicted in-cylinder pressures and heat release rates were compared with measurements. Predicted soot mass, soot particle size, soot number density distributions and other relevant quantities are presented and discussed. The effects of variable EGR rate (0-68%), injection pressure (600-1200 bar), and injection timing were studied. The predictions demonstrate that both EGR and retarded injection are beneficial for reducing NO{sub x} emissions, although the former has a more pronounced effect. Additionally, higher soot emissions are typically predicted for the higher EGR rates. However, when the EGR rate exceeds a critical value (over 65% in this study), the soot emissions decrease. Reduced soot emissions are also predicted when higher injection pressures or retarded injection timings are employed. The reduction in soot with retarded injection is less than what is observed experimentally, however.

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 943909
• Report Number(s): SAND2005-0188C
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
COMBUSTION
COMPRESSION RATIO
DIESEL ENGINES
HEAT TRANSFER
IGNITION
IMPINGEMENT
OXIDATION
PARTICLE SIZE
SHELL MODELS
SIMULATION
SOOT
TURBULENCE