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Kinetic modeling of particle size distribution of soot in a premixed burner-stabilized stagnation ethylene flame

Journal Article · · Combustion and Flame
 [1];  [2];  [3];  [2];  [2];  [2];  [3];  [2]
  1. Polytechnic Univ. of Milan (Italy); Stanford Univ., CA (United States)
  2. Polytechnic Univ. of Milan (Italy)
  3. Stanford Univ., CA (United States)

A detailed model of soot formation is proposed, which consists of a gas-phase kinetic model for the pyrolysis and oxidation of selected hydrocarbon fuels and a kinetic mechanism of soot nucleation and mass/size growth through coagulation and surface reactions. The gas-phase model (Ranzi et al., 2012) was expanded to include the chemistry of Polycyclic Aromatic Hydrocarbons (PAHs) up to four-to-five ring PAHs, with a modular and hierarchical approach. The discrete sectional approach was employed to solve the size evolution of the particle size distribution function (PSDF). Analogy and similarity rules were employed to describe heterogeneous reaction kinetics of soot surface reactions. A variable collision efficiency was assumed for the coalescence of small soot particles. Larger particles were assumed to undergo aggregation. The predicted PSDFs are found to be in reasonably good agreement with the experimental data for nascent soot measured in an atmospheric-pressure premixed ethylene–oxygen–argon flame in the burner-stabilized stagnation flame configuration. Sensitivity analyses of the PSDF, number density, and volume fraction were carried out with respect to the rate parameters of addition reactions of acetylene, PAHs, resonantly stabilized radical reactions, and coalescence and aggregation. The findings demonstrate that the reaction of PAHs and acetylene with soot surfaces and the kinetics of coalescence and aggregation exhibit dominant effects on the detailed and global soot properties for the flame studied, in agreement with conclusions of a large range of previous modeling studies.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Combustion Energy Frontier Research Center (CEFRC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001198
OSTI ID:
1369832
Alternate ID(s):
OSTI ID: 1246495
Journal Information:
Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 9 Vol. 162; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Structures and Energetics of Neutral and Cationic Pyrene Clusters journal October 2019
Measurement and extrapolation modeling of PAH laser-induced fluorescence spectra at elevated temperatures journal December 2018
Gas Phase Chemical Evolution of Uranium, Aluminum, and Iron Oxides journal July 2018
Reactive polycyclic aromatic hydrocarbon dimerization drives soot nucleation journal January 2018
Detailed kinetics of substituted phenolic species in pyrolysis bio-oils journal January 2019
The Role of Methyl Radical in Soot Formation journal December 2018
A phenomenological modelling framework for particle emission simulation in a direct-injection gasoline engine journal January 2020
The Role of Methyl Radical in Soot Formation text January 2018

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