TY - GEN
T1 - Computational Study of Stratified Combustion in an Optical Diesel Engine
AU - Jaasim, Mohammed
AU - Hernandez Perez, Francisco
AU - Vallinayagam, R.
AU - Vedharaj, S.
AU - Johansson, Bengt
AU - Im, Hong G.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST) under the Clean Combustion Research Center's research program. We also acknowledge funding from Saudi Aramco under the FUELCOM program. Finally, we would like to express our gratitude to our research Technician, Adrian I. Ichim for his support in carrying out the experiments at KAUST engine lab.
PY - 2017/3/28
Y1 - 2017/3/28
N2 - Full cycle simulations of KAUST optical diesel engine were conducted in order to provide insights into the details of fuel spray, mixing, and combustion characteristics at different start of injection (SOI) conditions. Although optical diagnostics provide valuable information, the high fidelity simulations with matched parametric conditions improve fundamental understanding of relevant physical and chemical processes by accessing additional observables such as the local mixture distribution, intermediate species concentrations, and detailed chemical reaction rates. Commercial software, CONVERGE™, was used as the main simulation tool, with the Reynolds averaged Navier-Stokes (RANS) turbulence model and the multi-zone (SAGE) combustion model to compute the chemical reaction terms. SOI is varied from late compression ignition (CI) to early partially premixed combustion (PPC) conditions. The simulation results revealed a stronger correlation between fuel injection timing and combustion phasing for late SOI conditions, whereas the combustion phasing starts to decouple from SOI for early SOI cases. The predictions are consistent with the experimental observations, in terms of the overall trends in combustion and emission characteristics, while the high fidelity simulations provided further insights into the effects of mixture stratifications resulting from different SOI conditions.
AB - Full cycle simulations of KAUST optical diesel engine were conducted in order to provide insights into the details of fuel spray, mixing, and combustion characteristics at different start of injection (SOI) conditions. Although optical diagnostics provide valuable information, the high fidelity simulations with matched parametric conditions improve fundamental understanding of relevant physical and chemical processes by accessing additional observables such as the local mixture distribution, intermediate species concentrations, and detailed chemical reaction rates. Commercial software, CONVERGE™, was used as the main simulation tool, with the Reynolds averaged Navier-Stokes (RANS) turbulence model and the multi-zone (SAGE) combustion model to compute the chemical reaction terms. SOI is varied from late compression ignition (CI) to early partially premixed combustion (PPC) conditions. The simulation results revealed a stronger correlation between fuel injection timing and combustion phasing for late SOI conditions, whereas the combustion phasing starts to decouple from SOI for early SOI cases. The predictions are consistent with the experimental observations, in terms of the overall trends in combustion and emission characteristics, while the high fidelity simulations provided further insights into the effects of mixture stratifications resulting from different SOI conditions.
UR - http://hdl.handle.net/10754/625055
UR - https://saemobilus.sae.org/content/2017-01-0573
UR - http://www.scopus.com/inward/record.url?scp=85019015395&partnerID=8YFLogxK
U2 - 10.4271/2017-01-0573
DO - 10.4271/2017-01-0573
M3 - Conference contribution
BT - SAE Technical Paper Series
PB - SAE International
ER -