The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations

Tagliante, Fabien; Nguyen, Tuan M.; Dhanji, Meghna P.; Sim, Hyung Sub; Pickett, Lyle M.; Manin, Julien; Kukkadapu, Goutham; Whitesides, Russell; Wan, Kevin

doi:10.1016/j.proci.2022.07.242

Title: The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations

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Abstract

Here this work investigates the low- and high-temperature ignition and combustion processes, applied to the Engine Combustion Network Spray A flame, combining advanced optical diagnostics and large-eddy simulations (LES). Simultaneous high-speed (50 kHz) formaldehyde (CH₂0) planar laser-induced fluorescence (PLIF) and line-of-sight OH* chemiluminescence imaging were used to measure the low- and high-temperature flame, during ignition as well as during quasi-steady combustion. While tracking the cool flame at the laser sheet plane, the present experimental setup allows detection of distinct ignition spots and dynamic fluctuations of the lift-off length over time, which overcomes limitations for flame tracking when using schlieren imaging. After significant development to improve LES prediction of the low-and high-temperature flame position, both during the ignition processes and quasi-steady combustion, the simulations were analyzed to gain understanding of the mixture variance and how this variance affects formation/consumption of CH₂0. Analysis of the high-temperature ignition period shows that a key improvement in the LES is the ability to predict heterogeneous ignition sites, not only in the head of the jet, but in shear layers at the jet edge close to the position where flame lift-off eventually stabilizes. The LES analysis also shows concentrated pockets of CH₂0, in the center ofmore »« less

Authors:

^[1];

^[2];

^[1]; Manin, Julien ^[1];

^[3];

^[3]; Wan, Kevin ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Sejong University, Seoul (Korea, Republic of)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Publication Date:: Sat Nov 12 00:00:00 EST 2022

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1994026

Alternate Identifier(s):: OSTI ID: 2000579

Report Number(s):: LLNL-JRNL-830842
Journal ID: ISSN 1540-7489; 1047467

Grant/Contract Number:: AC52-07NA27344; NA000352; NRF-2022R1F1A1071759

Resource Type:: Accepted Manuscript

Journal Name:: Proceedings of the Combustion Institute

Additional Journal Information:: Journal Volume: 39; Journal Issue: 4; Journal ID: ISSN 1540-7489

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; diesel spray combustion; cool-flame; large-eddy simulation; high-speed formaldehyde PLIF; OH* chemiluminescence

Citation Formats


                    Tagliante, Fabien, Nguyen, Tuan M., Dhanji, Meghna P., Sim, Hyung Sub, Pickett, Lyle M., Manin, Julien, Kukkadapu, Goutham, Whitesides, Russell, and Wan, Kevin. The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations.  United States: N. p., 2022. 
Web.  doi:10.1016/j.proci.2022.07.242.

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                    Tagliante, Fabien, Nguyen, Tuan M., Dhanji, Meghna P., Sim, Hyung Sub, Pickett, Lyle M., Manin, Julien, Kukkadapu, Goutham, Whitesides, Russell, & Wan, Kevin. The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations.  United States.  https://doi.org/10.1016/j.proci.2022.07.242

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                    Tagliante, Fabien, Nguyen, Tuan M., Dhanji, Meghna P., Sim, Hyung Sub, Pickett, Lyle M., Manin, Julien, Kukkadapu, Goutham, Whitesides, Russell, and Wan, Kevin. Sat .  
"The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations".  United States.  https://doi.org/10.1016/j.proci.2022.07.242.  https://www.osti.gov/servlets/purl/1994026.

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@article{osti_1994026,

  title        = {The role of cool-flame fluctuations in high-pressure spray flames, studied using high-speed optical diagnostics and Large-Eddy Simulations},

  author       = {Tagliante, Fabien and Nguyen, Tuan M. and Dhanji, Meghna P. and Sim, Hyung Sub and Pickett, Lyle M. and Manin, Julien and Kukkadapu, Goutham and Whitesides, Russell and Wan, Kevin},

  abstractNote = {Here this work investigates the low- and high-temperature ignition and combustion processes, applied to the Engine Combustion Network Spray A flame, combining advanced optical diagnostics and large-eddy simulations (LES). Simultaneous high-speed (50 kHz) formaldehyde (CH20) planar laser-induced fluorescence (PLIF) and line-of-sight OH* chemiluminescence imaging were used to measure the low- and high-temperature flame, during ignition as well as during quasi-steady combustion. While tracking the cool flame at the laser sheet plane, the present experimental setup allows detection of distinct ignition spots and dynamic fluctuations of the lift-off length over time, which overcomes limitations for flame tracking when using schlieren imaging. After significant development to improve LES prediction of the low-and high-temperature flame position, both during the ignition processes and quasi-steady combustion, the simulations were analyzed to gain understanding of the mixture variance and how this variance affects formation/consumption of CH20. Analysis of the high-temperature ignition period shows that a key improvement in the LES is the ability to predict heterogeneous ignition sites, not only in the head of the jet, but in shear layers at the jet edge close to the position where flame lift-off eventually stabilizes. The LES analysis also shows concentrated pockets of CH20, in the center of jet and at 20 mm downstream of the injector (in regions where the equivalence ratio is greater than 6), that are of similar length scale and frequency as the experiment (approximately 5–6 kHz). The periodic oscillation of CH20 match the frequency of pressure waves generated during auto-ignition and reflected within the constant-volume vessel throughout injection. The ability of LES to capture the periodic appearance and destruction of CH20 is particularly important because these structures travel downstream and become rich premixed flames that affect soot production.},

  doi          = {10.1016/j.proci.2022.07.242},

  journal      = {Proceedings of the Combustion Institute},

  number       = 4,

  volume       = 39,

  place        = {United States},

  year         = {Sat Nov 12 00:00:00 EST 2022},

  month        = {Sat Nov 12 00:00:00 EST 2022}

}

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