Simulations of soot formation in high-pressure transient spray flames

S. Ferreyro Fernandez, Daniel Connell Haworth

Research output: Contribution to conferencePaper

Abstract

A transported probability density function (PDF) method is exercised to generate insight into soot processes in transient high-pressure turbulent n-dodecane spray flames, under diesel-engine-relevant conditions. The emphasis is on a split-injection case, where the fuel is injected in two pulses of 0.5 ms each, separated by a dwell time of 0.5 ms during which no fuel is injected. PDF model results are compared with experimental measurements and with results from a locally well-stirred reactor (WSR) model that neglects unresolved turbulent fluctuations in composition and temperature. Computed total soot mass is highly sensitive to the modeling of unresolved turbulent fluctuations. To achieve the best agreement between model and experiment and to capture the highly intermittent nature of soot in the turbulent flame, it is necessary to accurately represent mixing and the high effective Schmidt number (low diffusivity) of soot particles. This is accomplished in the PDF framework using a mixing model that enforces locality in the gas-phase composition space, and not mixing the transported soot variables in the soot model. The results suggest that mixing is at least as important as kinetics in controlling soot formation and evolution in high-pressure turbulent flames.

Original languageEnglish (US)
StatePublished - Jan 1 2018
Event2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States
Duration: Mar 4 2018Mar 7 2018

Other

Other2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
CountryUnited States
CityState College
Period3/4/183/7/18

Fingerprint

Soot
soot
sprayers
flames
probability density functions
Probability density function
simulation
turbulent flames
transient pressures
Schmidt number
diesel engines
dwell
Phase composition
diffusivity
Diesel engines
Gases
reactors
injection
vapor phases
Kinetics

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)

Cite this

Ferreyro Fernandez, S., & Haworth, D. C. (2018). Simulations of soot formation in high-pressure transient spray flames. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.
Ferreyro Fernandez, S. ; Haworth, Daniel Connell. / Simulations of soot formation in high-pressure transient spray flames. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.
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Ferreyro Fernandez, S & Haworth, DC 2018, 'Simulations of soot formation in high-pressure transient spray flames' Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States, 3/4/18 - 3/7/18, .

Simulations of soot formation in high-pressure transient spray flames. / Ferreyro Fernandez, S.; Haworth, Daniel Connell.

2018. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.

Research output: Contribution to conferencePaper

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AU - Ferreyro Fernandez, S.

AU - Haworth, Daniel Connell

PY - 2018/1/1

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N2 - A transported probability density function (PDF) method is exercised to generate insight into soot processes in transient high-pressure turbulent n-dodecane spray flames, under diesel-engine-relevant conditions. The emphasis is on a split-injection case, where the fuel is injected in two pulses of 0.5 ms each, separated by a dwell time of 0.5 ms during which no fuel is injected. PDF model results are compared with experimental measurements and with results from a locally well-stirred reactor (WSR) model that neglects unresolved turbulent fluctuations in composition and temperature. Computed total soot mass is highly sensitive to the modeling of unresolved turbulent fluctuations. To achieve the best agreement between model and experiment and to capture the highly intermittent nature of soot in the turbulent flame, it is necessary to accurately represent mixing and the high effective Schmidt number (low diffusivity) of soot particles. This is accomplished in the PDF framework using a mixing model that enforces locality in the gas-phase composition space, and not mixing the transported soot variables in the soot model. The results suggest that mixing is at least as important as kinetics in controlling soot formation and evolution in high-pressure turbulent flames.

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Ferreyro Fernandez S, Haworth DC. Simulations of soot formation in high-pressure transient spray flames. 2018. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.