1154 BURNING VELOCITIES OF HYDROGEN-METHANE-AIR MIXTURES AT HIGHLY STEAM-DILUTED CONDITIONS

Burning Velocities and Flammability Limits of Premixed Methane/Air/Diluent Flames in Microgravity

Laminar burning velocities and flammability limits of premixed methane/air flames in the presence of various inert gases including helium, argon, nitrogen and carbon dioxide were investigated by combined use of microgravity experiments and computations. The experiments used a short-drop free-fall laboratory facility that can eliminate the effect of buoyancy on flames and therefore enable accura...

Transient Ignition and Combustion of Diluted Hydrogen/air Mixtures by a Thin Catalytic Wire

This paper reports on a study of transient ignition and combustion of hydrogen/air mixtures by a heated, thin catalytic wire in a natural convection environment. Modeling of the process is accomplished via a reduced set of heterogeneous kinetic processes which include dissociative adsorption and desorption of both reactants, three fast surface reactions of the Langmiur-Hinshelwood type, and the...

Production of hydrogen by unmixed steam reforming of methane

Numerical Modeling and Simulation of Highly Preheated and Diluted Air Combustion Furnaces

This paper presents some of the results of the modeling and simulation of an industrial furnace under the conventional combustion as well as under the highly preheated and diluted air combustion (HPDAC) conditions. The results are obtained using a computer program written by authors in FORTRAN language. It was found that, the HPDAC offers a more uniform and relatively moderate gas temperature p...

A Hypothetical Burning - Velocity Formula for Very Lean Hydrogen - Air Mixtures

Very lean hydrogen-air mixtures experience strong diffusive-thermal types of cellular instabilities that tend to increase the laminar burning velocity above the value that applies to steady, planar laminar flames that are homogeneous in transverse directions. Flame balls constitute an extreme limit of evolution of cellular flames. To account qualitatively for the ultimate effect of diffusive-th...