Studies in premixed turbulent combustion and carbon-particle burning

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5628900

Xie, D G

Part I. An earlier Reynolds stress/flux formation for premixed turbulent combustion according to the Bray-Moss-Libby model is specialized to normal flames sufficiently thin to be considered embedded in two regions of uniform turbulence. In contrast with earlier theories based on the same model a description of the mean rate of creation is required by inclusion of a gradient component to one of the third moment terms. The analysis divides into a portion concerned with the intensity of the fluctuations of the normal velocity component and the mean turbulent flux normal to the flame and a second portion concerned with the intensity of the tangential velocity component and the viscous dissipation. Part II. An earlier general formulation for premixed turbulent combustion based on the Bray-Moss-Libby model is specialized to thin flames oblique to the reactant stream and which have undeflected mean streamlines and thus tangential Reynolds shear stresses. A sequential calculation of the characteristics of such flames is involved. Part III. A theoretical approach utilizing element conservation and activation-energy asymptotics is used to describe the entire history of a carbon particle suddenly immersed in a hot oxidizing ambient. A new definition of ignition, denoted as computational ignition, and its AEA approximation are introduced.

• Research Organization: California Univ., San Diego (USA)
• OSTI ID: 5628900
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACTIVATION ENERGY
ASYMPTOTIC SOLUTIONS
CARBON
CHEMICAL REACTIONS
COMBUSTION
ELEMENTS
ENERGY
FLAMES
IGNITION
NONMETALS
OXIDATION
PARTICLES
THERMOCHEMICAL PROCESSES
TURBULENCE