Self-ignition of diesel spray combustion

Dhuchakallaya, Isares; Watkins, A. P.

doi:10.1007/s00231-009-0537-2

“…Further from Equation 66, q and p can be determined from the fuel, as in Equation 76, and from which is related to the ratio of carbon-based main products as shown in Equation 77. The value of is a choice and is typically taken to be 0.67 as is the case with this work [58,71,[76][77][78][79]83].…”

Section: Shell Autoignition Modelmentioning

confidence: 99%

“…The Shell model has seen several modifications since 1977 and has been primarily used to simulate autoignition in gasoline and diesel engines, or isolated diesel spray combustion[73][74][75][76][77][78][79][80][81][82][83]. The Arrhenius constants for the general reaction mechanism must be tuned with experiments for each fuel used.…”

mentioning

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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“…Further from Equation 66, q and p can be determined from the fuel, as in Equation 76, and from which is related to the ratio of carbon-based main products as shown in Equation 77. The value of is a choice and is typically taken to be 0.67 as is the case with this work [58,71,[76][77][78][79]83].…”

Section: Shell Autoignition Modelmentioning

confidence: 99%

“…The Shell model has seen several modifications since 1977 and has been primarily used to simulate autoignition in gasoline and diesel engines, or isolated diesel spray combustion[73][74][75][76][77][78][79][80][81][82][83]. The Arrhenius constants for the general reaction mechanism must be tuned with experiments for each fuel used.…”

mentioning

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