The Case for New Divided-Chamber Diesel Combustion Systems Part One: Critical Analysis of Current DI and Past Significant Divided-Chamber Engines

Regueiro, José F.

doi:10.4271/2001-01-0271

“…These include developments of the LAG (Lavinia Aktivatisia Gorenia or Avalanche Activated Combustion) technique (where the orifice between chambers is reduced so that the flame from the prechamber is quenched, and only active radicals are expelled into the main chamber, Figure 7), dual-fuel configurations with hydrogen as the prechamber fuel, and dual-mode operation (high-load and part-load). For in-depth reviews of prechamber use the reader is referred to [31,[39][40][41][42].…”

Section: Prechamber Reviewmentioning

confidence: 99%

Numerical simulation of liquid fuel prechamber ignition

Larson¹

2021

Preprint

0

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A Computational Fluid Dynamics (CFD) model was built that simulates the transient, compressible, reacting, multi-phase environment that exists within a reciprocating engine's combustion chamber(s). ANSYS Fluent v13.0 was used with the Euler-Lagrangian Discrete Phase Model (DPM), the Shell autoignition model, and the Large Eddy Simulation (LES) method of turbulence modeling. Validation of the spray dynamics was performed by comparing simulation results with experiments of liquid and vapour penetration length of an n-Heptane spray experiment done by Sandia National Laboratories. It was found that LES produced more accurate results than several Reynolds Averaged Navier-Stokes (RANS) models. The Shell autoignition model was coded to function with C10.17H19.91 and compared with experimental ignition results in a Rapid Compression Machine (RCM) environment. All of the above models were then combined to simulate a directly-fueled lean-burn combustion prechamber configuration wherein the effects of spray angle, timing, and duration were studied.

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“…These include developments of the LAG (Lavinia Aktivatisia Gorenia or Avalanche Activated Combustion) technique (where the orifice between chambers is reduced so that the flame from the prechamber is quenched, and only active radicals are expelled into the main chamber, Figure 7), dual-fuel configurations with hydrogen as the prechamber fuel, and dual-mode operation (high-load and part-load). For in-depth reviews of prechamber use the reader is referred to [31,[39][40][41][42].…”

Section: Prechamber Reviewmentioning

confidence: 99%

Numerical simulation of liquid fuel prechamber ignition

Larson¹

2021

Preprint

0

View full text Add to dashboard Cite

A Computational Fluid Dynamics (CFD) model was built that simulates the transient, compressible, reacting, multi-phase environment that exists within a reciprocating engine's combustion chamber(s). ANSYS Fluent v13.0 was used with the Euler-Lagrangian Discrete Phase Model (DPM), the Shell autoignition model, and the Large Eddy Simulation (LES) method of turbulence modeling. Validation of the spray dynamics was performed by comparing simulation results with experiments of liquid and vapour penetration length of an n-Heptane spray experiment done by Sandia National Laboratories. It was found that LES produced more accurate results than several Reynolds Averaged Navier-Stokes (RANS) models. The Shell autoignition model was coded to function with C10.17H19.91 and compared with experimental ignition results in a Rapid Compression Machine (RCM) environment. All of the above models were then combined to simulate a directly-fueled lean-burn combustion prechamber configuration wherein the effects of spray angle, timing, and duration were studied.

show abstract