Methane Flame Propagation in a Compositionally Stratified Gas
Title | Methane Flame Propagation in a Compositionally Stratified Gas PDF eBook |
Author | Taekyu Kang |
Publisher | |
Pages | 118 |
Release | 2005 |
Genre | |
ISBN |
Experimental and Theoretical Investigation of Flame Propagation Through Compositionally Stratified Methane -Air Mixtures
Title | Experimental and Theoretical Investigation of Flame Propagation Through Compositionally Stratified Methane -Air Mixtures PDF eBook |
Author | |
Publisher | |
Pages | |
Release | 2008 |
Genre | |
ISBN |
Laminar Flame Propagation in Mixtures with Compositional Stratification at Small Length Scales
Title | Laminar Flame Propagation in Mixtures with Compositional Stratification at Small Length Scales PDF eBook |
Author | David P. Schmidt |
Publisher | |
Pages | |
Release | 2011 |
Genre | |
ISBN |
The behavior and structure of laminar hydrocarbon flames which propagate parallel to the direction of a periodic gradient of mixture composition was studied both experimentally, using a specially designed burner, and computationally, using a planar numerical model. The variations in local mixture composition led to the formation of wrinkled flames, the structure of which were dependent on both chemical and physical parameters of the particular flame configuration. A qualitative study using chemiluminescence imaging of stratified methane and propane flames was conducted to characterize their response to variations in overall mixture composition, strength and length scale of the stratification, and flow field velocity. A two-dimensional numerical study was performed to assess the abilities of reduced global kinetic models to predict the behavior of stratified flames in comparison to computations performed using detailed mechanisms. It was observed that the reduced kinetic models display a lower limit of stratification length scale, which is on the order of the laminar flame thickness, below which accurate prediction of flame behavior is no longer possible. Under these conditions, the computed flames were observed to undergo a deformation which was much larger than the wrinkling imposed by the compositional variation, and was unsteady in time. Further analysis of these deformed flames suggested that a potential cause of this behavior was a failure of the reduced kinetics to capture the increase in local reaction rate attributed to stratification, and the inability of the driving reactions to counterbalance the incoming mass flux of fuel led to destabilization of the flame front. A preliminary analysis of the local stretch rates of the wrinkled flames was also conducted, and it was observed that even with a uniform incoming flow field, variations in mixture composition were capable of stretching the flames. The stretch behavior observed was one of alternating flame stretch and flame compression, which reached very large magnitudes over short distances.
Formation and Flammability of Stratified Methane-air Mixtures
Title | Formation and Flammability of Stratified Methane-air Mixtures PDF eBook |
Author | Henry E. Perlee |
Publisher | |
Pages | 32 |
Release | 1964 |
Genre | Firedamp |
ISBN |
Joint Meeting of the U.S. Sections of the Combustion Institute, Western States, Central States, Eastern States
Title | Joint Meeting of the U.S. Sections of the Combustion Institute, Western States, Central States, Eastern States PDF eBook |
Author | |
Publisher | |
Pages | 138 |
Release | 2005 |
Genre | Combustion |
ISBN |
Propagation of Flame in Mixtures of Natural Gas and Air
Title | Propagation of Flame in Mixtures of Natural Gas and Air PDF eBook |
Author | Hubert Frank Coward |
Publisher | |
Pages | 32 |
Release | 1928 |
Genre | Flame |
ISBN |
Ignition and Flame Propagation Within Stratified Methane-air Mixtures Formed by Convective Diffusion [microform]
Title | Ignition and Flame Propagation Within Stratified Methane-air Mixtures Formed by Convective Diffusion [microform] PDF eBook |
Author | Hei Tung Lam |
Publisher | National Library of Canada |
Pages | 256 |
Release | 1984 |
Genre | Diffusion |
ISBN | 9780315211186 |