Steady combustion of solid fuel gas-suspensions. Laminar diffusion two-phase flame

Radiative characteristics of an aluminum dust flame. Condensed phase

“…A LDTF of aluminum was produced by a dust burner [1,2,4] consisting of two vertical coaxial cylinders. Aluminum particles were delivered by the carrier gas through the inside tube of diameter 2.4 cm.…”

A correlation function method of recovering the combustion law parameters for particles burning in optically thin dust flames

“…The supply of particles into the flame was organized with a piezoelectric lamina (1) with a hole in the middle. The mass supply rate of particles was governed by the oscillating lamina operated via a supply rate controller (2). To protect the lamina against fire, particles fall down from the hole in the lamina into the flame through a quartz tube (i.d.…”

“…The propagation of a combustion front through a cloud of solid or liquid fuel particles suspended in a gaseous oxidizer is a subject of much interest in combustion science [1][2][3][4][5]. It is evident that the conditions for a particle burning in a suspension differ from those 0010 Nomenclature d 0 initial diameter of a particle F function describing the shape of the radiation trace from a burning particle I (t) intensity of the radiation emitted by a dust flame I ν (t) intensity of the radiation emitted by a particle k combustion law prefactor (combustion constant) m ratio of exponents, δ/γ n number of particles P (n) probability distribution function for the number of ignitions within T t time T…”

Ignition and Combustion of Dust-Gas Suspensions

“…The fundamental possibility of obtaining stationary LDTFs for various metals (Mg, Al, Zr, Fe, and Ti) is shown in [34,35]; some characteristics of LDTFs (the concentration and consumption limits of existence, the dependences of the flame length on the parameters of gaseous suspensions and oxidizing gas) were studied experimentally and analyzed theoretically in [26,35,36]. Such flames are of interest both as independent structures and as objects that allow one to study the combustion mechanisms of gas suspensions of metal particles in oxygen-containing media, the structures of combustion zones around the particles, the optical characteristics of burning metals, and the mechanisms of formation and growth of condensed-phase combustion products [26,28,37].…”

“…For this, it is necessary to estimate the combustion-zone width of the LDTF, which for known concentration and size distribution of the fuel gives the required relation. By analogy with the reaction of microheterogeneous systems on an equalaccess surface [10,38], the combustion-zone width can be estimated as the depth of penetration of oxidizer l = D/(k fl ) [35], where k fl = N S p k p β p k p + β p is the burning rate constant of the gaseous suspension, N is the fuel particle number concentration, S p is the particle surface, k p is the specific reaction rate on the particle surface, and β p is the mass-transfer coefficient for a particle. Then, it is easy to show that for small particles k p < β p , i.e., for the conditions of the experiment, we have…”