NDLI: Relationship between the dust flame propagation velocity and the combustion mode of fuel particles

Content Provider	Springer Nature Link
Author	Poletaev, N. I.
Copyright Year	2016
Abstract	A possibility of determining the regime of combustion of individual fuel particles on the basis of the dependence of the flame velocity on the fuel and oxidizer concentrations is considered by an example of a dust flame of microsized metal particles with diameters d 10 < 15 μm and particle concentrations from ≈1010 to 1011 m−3 in oxygen-containing media at atmospheric pressure. The combustion mode (kinetic or diffusion) is responsible for the qualitative difference in the character of the normal velocity of the flame as a function of the basic parameters of the gas suspension. The analysis of such experimental dependences for fuel-rich mixtures shows that combustion of zirconium particles (d 10 = 4 μm) in a laminar dust flame is controlled by oxidizer diffusion toward the particle surface, whereas combustion of iron particles of a similar size is controlled by kinetics of heterogeneous reactions. For aluminum particles with d 10 = 5–15 μm, there are no clearly expressed features of either kinetic or diffusion mode of combustion. To obtain more information about the processes responsible for combustion of fine aluminum particles, the flame velocity is studied as a function of the particle size and initial temperature of the gas suspension. It is demonstrated that aluminum particles under the experimental conditions considered in this study burn in the transitional mode.
Starting Page	673
Ending Page	682
Page Count	10
File Format	PDF
ISSN	00105082
Journal	Combustion, Explosion and Shock Waves
Volume Number	52
Issue Number	6
e-ISSN	15738345
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-12-24
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dust flame of metals flame propagation velocity particle burning law diffusion and kinetic modes of combustion Classical Mechanics Classical and Continuum Physics Physical Chemistry Vibration, Dynamical Systems, Control Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Physics and Astronomy Fuel Technology Chemical Engineering Energy Engineering and Power Technology

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