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The structure of particle cloud premixed flames
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Berlad, A. L. Seshadri, K. |
| Copyright Year | 1992 |
| Description | The structure of premixed flames propagating in combustible systems containing uniformly distributed volatile fuel particles in an oxidizing gas mixture is analyzed. This analysis is motivated by experiments conducted at NASA Lewis Research Center on the structure of flames propagating in combustible mixtures of lycopodium particles and air. Several interesting modes of flame propagation were observed in these experiments depending on the number density and the initial size of the fuel particle. The experimental results show that steady flame propagation occurs even if the initial equivalence ratio of the combustible mixture based on the gaseous fuel available in the particles, phi sub u, is substantially larger than unity. A model is developed to explain these experimental observations. In the model, it is presumed that the fuel particles vaporize first to yield a gaseous fuel of known chemical composition which then reacts with oxygen in a one-step overall process. The activation energy of the chemical reaction is presumed to be large. The activation energy characterizing the kinetics of vaporization is also presumed to be large. The equations governing the structure of the flame were integrated numerically. It is shown that the interplay of vaporization kinetics and oxidation process can result in steady flame propagation in combustible mixtures where the value of phi sub u is substantially larger than unity. This prediction is in agreement with experimental observations. |
| File Size | 312252 |
| Page Count | 11 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930016040 |
| Archival Resource Key | ark:/13960/t48q0xq25 |
| Language | English |
| Publisher Date | 1992-09-13 |
| Access Restriction | Open |
| Subject Keyword | Inorganic And Physical Chemistry Fuel Combustion Premixed Flames Flame Propagation Fuel Sprays Drops Liquids Gas Mixtures Gaseous Fuels Vaporizing Equivalence Reaction Kinetics Oxidation Chemical Composition Activation Energy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
