Ignition and Combustion of Dust-Gas Suspensions

Abstract

The ignition and combustion of dust-gas suspensions are considered. It is shown that the ability of these systems to accumulate heat is determined not only by their kinetic and thermal properties but also by the relation between their reaction surface and the heat-removal surface (f ). Experimental information on flame temperatures, ignition delays, and flame propagation over gas suspensions is processed using the parameter f , and the postulate on the stimulating role of the developed reaction surface in activating these processes is validated. It is shown that during overall burning, diffusion combustion of particles occurs only for rather small values of f . The ambiguous effect of the parameter f on the ignition and combustion processes leads to the necessity of optimizing the fuel size distribution and concentration for the effective operation of the power devices. The role of the macroparameters of two-phase flames of refractory metals in the synthesis of combustion nanoproducts is analyzed.

Problems in studying formation of smoke oxide particles in combustion of aluminized solid propellants

“…It seems of interest to compare the data obtained with the results for suspensions of aluminum particles in air [24][25][26]. These results indicate a higher dispersion of condensed combustion products and an obviously prevailing role of gas-phase combustion of metal particles.…”

Numerical simulation of aerodynamics and combustion of a gas mixture in a channel with sudden expansion

“…The products of aluminum combustion were assumed to be condensed particles of the aluminum oxide Al 2 O 3 with an identical diameter D c = 0.2 μm [19][20][21][22].…”

Shock-Induced the Ignition Mechanism of Micrometer Aluminum/Propylene Oxide

“…The parameters of the incident shock wave can be obtained from the measured velocity and pressure to evaluate the characteristic of the incident shock wave and possible ignition mechanism. There have been several investigations into the combustion mechanism of micron-sized aluminum particles [3,4]. Some reports suggest that the ignition temperature coincides with the melting point of aluminum oxide [5].…”