Mechanisms of flame extinction and lean blowout of bluff body stabilized flames

2019 ◽  
Vol 203 ◽  
pp. 31-45 ◽  
Author(s):  
Anthony J. Morales ◽  
Ian M. Lasky ◽  
Marissa K. Geikie ◽  
Christian A. Engelmann ◽  
Kareem A. Ahmed
Keyword(s):  
Bluff Body ◽  
Flame Extinction ◽  
Lean Blowout ◽  
Stabilized Flames

C2*/CH* Intensity Ratios of Bluff Body Stabilized Flames Approaching Lean Blowout at Elevated Pressures

2022 ◽  
Author(s):  
Michael E. Tonarely ◽  
Max K. Fortin ◽  
Tommy Genova ◽  
Anthony Morales ◽  
Bernhard Stiehl ◽  
...  
Keyword(s):  
Bluff Body ◽  
Lean Blowout ◽  
Elevated Pressures ◽  
Intensity Ratios ◽  
Stabilized Flames

Influence of Fuel Characteristics in a Correlation to Predict Lean Blowout of Bluff-Body Stabilized Flames

2015 ◽  
Author(s):  
Bethany C. Huelskamp ◽  
Barry V. Kiel ◽  
Ponnuthurai Gokulakrishnan
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Bluff Body ◽  
Ignition Delay Time ◽  
Laminar Flame ◽  
Damkohler Number ◽  
Lean Blowout ◽  
Damköhler Number ◽  
Combining Data ◽  
Stabilized Flames

This study employed experimental data collected at the Air Force Research Laboratory (AFRL) as well as data from a review of past literature to develop a correlation for predicting lean blowout through the use of a least-squares curve-fit method. Combining data from the literature with data from AFRL allowed significant variations within the dataset with regard to velocity, flameholder diameter and shape, pressure, temperature, and fuel. Gaseous, single-component fuels as well as multi-component jet fuels were included in the study. The study reports new jet fuel blowout data. The laminar flame speed and ignition delay time calculated using detailed chemical kinetics mechanisms were used in the correlations to determine the chemical timescales relevant to lean blowout. The correlation presented here indicates that the lean blowout of bluff-body stabilized flames is dependent on the Damköhler number, with fuel variation being a significant factor. The ratio of the flameholder diameter to the lip velocity was found to influence the lean blowout. This ratio represents the fluid-mechanic timescale in the Damköhler number. Pressure, temperature, and the hydrogen-to-carbon ratio of the fuel affect the reactivity of the mixture, contributing to the chemical timescale in the Damköhler number. For a limited dataset, the ignition delay time is an adequate representation of the chemical timescale.

scholarly journals Pressure gradient tailoring effects on the mechanisms of bluff-body flame extinction

2020 ◽  
Vol 215 ◽  
pp. 224-237 ◽  
Author(s):  
Anthony J. Morales ◽  
Jonathan Reyes ◽  
Peter H. Joo ◽  
Isaac Boxx ◽  
Kareem A. Ahmed
Keyword(s):  
Pressure Gradient ◽  
Bluff Body ◽  
Flame Extinction

Extinction Conditions of Low-Speed Ballistic Bluff-Body Stabilized Flames

2017 ◽  
Author(s):  
Christian Engelmann ◽  
Marissa K. Geikie ◽  
Anthony J. Morales ◽  
Kareem Ahmed
Keyword(s):  
Bluff Body ◽  
Low Speed ◽  
Stabilized Flames

scholarly journals Joint Scalar versus Joint Velocity-Scalar PDF Simulations of Bluff-Body Stabilized Flames with REDIM

2008 ◽  
Vol 82 (2) ◽  
pp. 185-209 ◽  
Author(s):  
B. Merci ◽  
B. Naud ◽  
D. Roekaerts ◽  
U. Maas
Keyword(s):  
Bluff Body ◽  
Stabilized Flames ◽  
Joint Velocity
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