Results 111 to 120 of about 217 (162)
Some of the next articles are maybe not open access.
Influence of Vorticity on Counterflow Diffusion Flames
Combustion Science and Technology, 1987Abstract The extinction characteristics of diffusion flames of methane and butane in counterflow jets under opposing rigid-body rotation are investigated. It is found that the critical volumetric concentration of fuels in nitrogen corresponding to flame extinction decrease to a minimum value and increase thereafter as the jet angular velocity increases.
T. H. LIN, S. H. SOHRAB
openaire +1 more source
Effect of Outer Edge Flame on Flame Extinction in Counterflow Diffusion Flames
Transactions of the Korean Society of Mechanical Engineers B, 2012The present study on nitrogen-diluted non-premixed counterflow flames with finite burner diameters experimentally investigates the important role of the outer edge flame in flame extinction. Flame stability diagrams mapping the flame extinction response of nitrogen-diluted non-premixed counterflow flames to varying global strain rates in terms of the ...
Yong-Ho Chung +5 more
openaire +1 more source
Unsteady counterflowing strained diffusion flames: diffusion-limited frequency response
Journal of Fluid Mechanics, 1996A detailed numerical study has been conducted on the effect of unsteadiness on the dynamics of counterflowing strained diffusion methane/oxygen/nitrogen flames. The modelling included the solution of the unsteady conservation equations of mass, momentum, energy, and species along the stagnation streamline in an opposed jet using detailed descriptions ...
Egolfopoulos, Fokion N. +1 more
openaire +2 more sources
Double-spray counterflow diffusion flame model
Combustion Theory and Modelling, 1998In this spray model we consider two gaseous streams approaching each other from opposite directions in a counterflow. The two opposed streams each carry a distribution of liquid droplets. The sprays vaporize, and the vaporized fuel and oxidizer gases diffuse and convect toward a chemical reaction region near the stagnation plane, at which the reactants
Indrek S Wichman, Michael Yang
openaire +1 more source
Effect of turbulence on extinction of counterflow diffusion flame
Symposium (International) on Combustion, 1994A laminar counterflow diffucion flame established in the forward stagnation region of a porous cylinderhas been used widely for the laminar flame studies. In the present study, this flame was applied to investigating the extinction of a diffusion flame due to air stream turbulence. Propane or methane was ejected from a 30-mm porous cylinder.
Hiroshi Tsuji +2 more
openaire +1 more source
Studies of Counterflow Diffusion Flames at Low Pressures
Combustion Science and Technology, 1997Methane-oxygen, methane-nitrous oxide and carbon monoxide-nitrous oxide counterflow diffusion flames have been studied at low pressures. Species concentrations have been measured using probe extraction and gas chromatography, and temperatures have been measured using thermo- couples.
J. J. Cor, M. C. Branch
openaire +1 more source
Kinetic modeling of counterflow diffusion flames of butadiene
Combustion and Flame, 2002A comprehensive, semi-detailed kinetic scheme was used to simulate the chemical structures of counterflow diffusion and fuel-rich premixed 1,3-butadiene flames, to better understand the formation of polycyclic aromatic hydrocarbons (PAH). The results showed that model predictions were in good agreement with the experiments for most of the species in ...
Silvia Granata +4 more
openaire +1 more source
Multiradii modeling of counterflow spray diffusion flames
Proceedings of the Combustion Institute, 2000A multiradii spray flame model is derived in a kinetic framework in which the droplets' distribution function is taken as a sum of delta products. The droplet class equations are obtained by taking moments of the Boltzmann-type spray equation. The gas-phase equations are coupled to the droplets equations through various integral sources terms.
R. Ben Dakhlia, V. Giovangigli
openaire +1 more source
Nanosecond Plasma Enhanced Counterflow Diffusion Flames
42nd AIAA Plasmadynamics and Lasers Conference, 2011The present work establishes an integrated theoretical/numerical framework to study the characteristics of plasma enhanced H2-air counterflow diffusion flames. The oxidizer flow is activated by a parallel-plate nanosecond pulsed plasma discharge system with pulse duration ranging between 15 to 130 ns, and pulsing frequency between 5 to 60 kHz.
Sharath Nagaraja, Vigor Yang
openaire +1 more source
On PAH formation in strained counterflow diffusion flames
Combustion and Flame, 2001The structural response of methane/air and methane-nitrogen/air counterflow diffusion flames to strain was investigated by measurements and computations. The numerical predictions were found to be in reasonably good agreement with the experiments. Different reaction pathways leading to PAH formation are examined computationally to obtain a deeper ...
Böhm, Heidi +5 more
openaire +1 more source