Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode

Yanzhao An; Mohammed Jaasim; R Vallinayagam; Abdullah AlRamadan; Jaeheon Sim; Junseok Chang; Hong G. Im; Bengt Johansson

doi:10.4271/2018-01-1797

Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode

Yanzhao An, Mohammed Jaasim, R Vallinayagam, Abdullah AlRamadan, Jaeheon Sim, Junseok Chang, Hong G. Im, Bengt Johansson

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

16 Scopus citations

Abstract

Partially premixed combustion (PPC) is an operating mode that lies between the conventional compression ignition (CI) mode and homogeneous charge compression ignition (HCCI) mode. The combustion in this mixed mode is complex as it is neither diffusion-controlled (CI mode) nor governed solely by chemical kinetics (HCCI mode). In this study, CFD simulations were performed to evaluate flame index, which distinguishes between zones having a premixed flame and non-premixed flame. Experiments performed in the optical engine supplied data to validate the model. In order to realize PPC, the start of injection (SOI) was fixed at -40 CAD (aTDC) so that a required ignition delay is created to premix air/fuel mixture. The reference operating point was selected to be with 3 bar IMEP and 1200 rpm. Naphtha with a RON of 77 and its corresponding PRF surrogate were tested. The simulations captured the general trends observed in the experiments well. The flame index was noted to be an indicator to evaluate and quantify the in-cylinder combustion development under PPC engine operating condition. The evolution of premixed flames shows the same two-stage ignition behavior as the rate of heat release. Premixed flames are surrounded by the non-premixed fuel/air mixtures and distribute in the piston top-land region as isolated clouds. The proportion of premixed flames increases from low temperature heat release (LTHR) region first and decreases in negative temperature coefficient (NTC) region then increases to high temperature heat release (HTHR) region at PPC mode.

Original language	English (US)
Title of host publication	SAE Technical Paper Series
Publisher	SAE International
DOIs	https://doi.org/10.4271/2018-01-1797
State	Published - Sep 10 2018

Bibliographical note

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) and Saudi Aramco under the FUELCOM2 program. The authors would also like to Adrian I. Ichim and Riyad Jambi in KAUST Engine Laboratory for providing the experimental data. The simulations utilized resources at the KAUST Supercomputing Laboratory (KSL).

Access to Document

10.4271/2018-01-1797

Cite this

@inproceedings{3d05f0101cdd4f429fab0deeb0130a85,

title = "Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode",

abstract = "Partially premixed combustion (PPC) is an operating mode that lies between the conventional compression ignition (CI) mode and homogeneous charge compression ignition (HCCI) mode. The combustion in this mixed mode is complex as it is neither diffusion-controlled (CI mode) nor governed solely by chemical kinetics (HCCI mode). In this study, CFD simulations were performed to evaluate flame index, which distinguishes between zones having a premixed flame and non-premixed flame. Experiments performed in the optical engine supplied data to validate the model. In order to realize PPC, the start of injection (SOI) was fixed at -40 CAD (aTDC) so that a required ignition delay is created to premix air/fuel mixture. The reference operating point was selected to be with 3 bar IMEP and 1200 rpm. Naphtha with a RON of 77 and its corresponding PRF surrogate were tested. The simulations captured the general trends observed in the experiments well. The flame index was noted to be an indicator to evaluate and quantify the in-cylinder combustion development under PPC engine operating condition. The evolution of premixed flames shows the same two-stage ignition behavior as the rate of heat release. Premixed flames are surrounded by the non-premixed fuel/air mixtures and distribute in the piston top-land region as isolated clouds. The proportion of premixed flames increases from low temperature heat release (LTHR) region first and decreases in negative temperature coefficient (NTC) region then increases to high temperature heat release (HTHR) region at PPC mode.",

author = "Yanzhao An and Mohammed Jaasim and R Vallinayagam and Abdullah AlRamadan and Jaeheon Sim and Junseok Chang and Im, {Hong G.} and Bengt Johansson",

note = "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) and Saudi Aramco under the FUELCOM2 program. The authors would also like to Adrian I. Ichim and Riyad Jambi in KAUST Engine Laboratory for providing the experimental data. The simulations utilized resources at the KAUST Supercomputing Laboratory (KSL).",

year = "2018",

month = sep,

day = "10",

doi = "10.4271/2018-01-1797",

language = "English (US)",

booktitle = "SAE Technical Paper Series",

publisher = "SAE International",

}

TY - GEN

T1 - Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode

AU - An, Yanzhao

AU - Jaasim, Mohammed

AU - Vallinayagam, R

AU - AlRamadan, Abdullah

AU - Sim, Jaeheon

AU - Chang, Junseok

AU - Im, Hong G.

AU - Johansson, Bengt

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) and Saudi Aramco under the FUELCOM2 program. The authors would also like to Adrian I. Ichim and Riyad Jambi in KAUST Engine Laboratory for providing the experimental data. The simulations utilized resources at the KAUST Supercomputing Laboratory (KSL).

PY - 2018/9/10

Y1 - 2018/9/10

N2 - Partially premixed combustion (PPC) is an operating mode that lies between the conventional compression ignition (CI) mode and homogeneous charge compression ignition (HCCI) mode. The combustion in this mixed mode is complex as it is neither diffusion-controlled (CI mode) nor governed solely by chemical kinetics (HCCI mode). In this study, CFD simulations were performed to evaluate flame index, which distinguishes between zones having a premixed flame and non-premixed flame. Experiments performed in the optical engine supplied data to validate the model. In order to realize PPC, the start of injection (SOI) was fixed at -40 CAD (aTDC) so that a required ignition delay is created to premix air/fuel mixture. The reference operating point was selected to be with 3 bar IMEP and 1200 rpm. Naphtha with a RON of 77 and its corresponding PRF surrogate were tested. The simulations captured the general trends observed in the experiments well. The flame index was noted to be an indicator to evaluate and quantify the in-cylinder combustion development under PPC engine operating condition. The evolution of premixed flames shows the same two-stage ignition behavior as the rate of heat release. Premixed flames are surrounded by the non-premixed fuel/air mixtures and distribute in the piston top-land region as isolated clouds. The proportion of premixed flames increases from low temperature heat release (LTHR) region first and decreases in negative temperature coefficient (NTC) region then increases to high temperature heat release (HTHR) region at PPC mode.

AB - Partially premixed combustion (PPC) is an operating mode that lies between the conventional compression ignition (CI) mode and homogeneous charge compression ignition (HCCI) mode. The combustion in this mixed mode is complex as it is neither diffusion-controlled (CI mode) nor governed solely by chemical kinetics (HCCI mode). In this study, CFD simulations were performed to evaluate flame index, which distinguishes between zones having a premixed flame and non-premixed flame. Experiments performed in the optical engine supplied data to validate the model. In order to realize PPC, the start of injection (SOI) was fixed at -40 CAD (aTDC) so that a required ignition delay is created to premix air/fuel mixture. The reference operating point was selected to be with 3 bar IMEP and 1200 rpm. Naphtha with a RON of 77 and its corresponding PRF surrogate were tested. The simulations captured the general trends observed in the experiments well. The flame index was noted to be an indicator to evaluate and quantify the in-cylinder combustion development under PPC engine operating condition. The evolution of premixed flames shows the same two-stage ignition behavior as the rate of heat release. Premixed flames are surrounded by the non-premixed fuel/air mixtures and distribute in the piston top-land region as isolated clouds. The proportion of premixed flames increases from low temperature heat release (LTHR) region first and decreases in negative temperature coefficient (NTC) region then increases to high temperature heat release (HTHR) region at PPC mode.

UR - http://hdl.handle.net/10754/630713

UR - https://saemobilus.sae.org/content/2018-01-1797

UR - http://www.scopus.com/inward/record.url?scp=85056879093&partnerID=8YFLogxK

U2 - 10.4271/2018-01-1797

DO - 10.4271/2018-01-1797

M3 - Conference contribution

BT - SAE Technical Paper Series

PB - SAE International

ER -

Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this