Abstract
One of the major concerns in high pressure combustion is its high soot yield, which was observed in many sooting flame experiments. An exact and comprehensive mechanism behind this phenomenon, from a chemical kinetics perspective, is still elusive. In this study, a series of pressurized (1-16 atm) co-flow ethylene diffusion sooting flames are simulated with detailed finite-rate chemistry. The soot evolution is described by the bivariate Hybrid Method of Moments (HMOM). The simulations well reproduce the experimental maximum soot volume fraction and its scaling law with the increasing pressure. Global Pathway Analysis (GPA) is conducted to reveal the dominance and sensitivity of soot chemical pathways at elevated pressures. It is found that elevated pressures could switch the dominant global pathway (GP) to reactions through indene/indenyl for the formation of naphthalene (A2), which indicates the potential direction to improve the chemical mechanism for elevated pressures. In addition, the dominant GP (based on C element flux) from fuel to H2 O at elevated pressures is found to produce more H radical, which promotes the soot surface growth significantly. Radiation effect on the soot formation and evolution is also analyzed and discussed in this study.
Original language | English (US) |
---|---|
Title of host publication | AIAA Scitech 2020 Forum |
Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
ISBN (Print) | 9781624105951 |
DOIs | |
State | Published - 2020 |
Event | AIAA Scitech Forum, 2020 - Orlando, United States Duration: Jan 6 2020 → Jan 10 2020 |
Publication series
Name | AIAA Scitech 2020 Forum |
---|---|
Volume | 1 PartF |
Conference
Conference | AIAA Scitech Forum, 2020 |
---|---|
Country/Territory | United States |
City | Orlando |
Period | 1/6/20 → 1/10/20 |
Bibliographical note
Publisher Copyright:© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.