Critical diameter and transverse waves of powder combustion

Marshakov, V. N.; Istratov, A. G.

doi:10.1007/s10573-007-0025-2

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…This instability is not described by the Zel'dovich-Novozhilov model, which assumes that the indicated zone is quasisteady-state. The instability is manifested as random fluctuations of the combustion wave parameters, which are observed visually (including the region of stability after Zel'dovich-Novozhilov) as local luminescent zones moving over the surface [34][35][36][37][38]. 2 The phase randomness of the fluctuations along the surface is explained by the absence of a mechanism that ensures their synchronism over the entire burning surface.…”

Section: Erosive Burning Of Ems With Significant Subsurface Heat Releasementioning

confidence: 99%

Erosive burning. Modeling problems

Gusachenko

Зарко

2007

Combust Explos Shock Waves

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Existing models for the erosive burning of homogeneous energetic materials ignore the fact that the burning regime can be changed radically by exposure to a hot gas blowing over the burning surface. In other words, transition can occur from the gasification regime at very high blowing rates (where the burning rate is determined primarily by the heat transfer from the flow core) to the self-heating regime of the condensed phase at low or zero blowing if the heat release in the condensed phase is sufficient to heat it to the surface temperature. A possible method for solving this problem is proposed. The approach proposed provides a plausible explanation for the experimentally observed singular (kinked) dependence of the magnitude of the negative erosion effect on the initial temperature.

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Section: Erosive Burning Of Ems With Significant Subsurface Heat Releasementioning

confidence: 99%

Erosive burning. Modeling problems

Gusachenko

Зарко

2007

Combust Explos Shock Waves

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“…Moreover, the main combustion model of these studies is a model in which solid fuel, as a result of decomposition, passes directly into the gas phase and then instantly burns [19]. However, the multi-dimensionality of the solid-fuel combustion process is quite obvious and experimentally proved [20,21], which makes it necessary to study the hydrodynamic sta-bility of the combustion front to small multi-dimensional perturbations.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

A theoretical study of stability of solid fuel burning with a twophase gasification area

Волков

Makoyed

Loboda

et al. 2020

EEJET

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Theoretically, the combustion stability of solid fuel, which during the combustion process is decomposed according to the "solid phase-liquid phase-gas" scheme, is investigated. The physical and mathematical models for the propagation of small perturbations of combustion are constructed. The medium in all areas of combustion and in combustion products is assumed to be incompressible, and the viscosity of the fuel in the liquid phase is taken into account. Thus, perturbations of hydrodynamic parameters are considered not only in the two-phase gasification zone, but also in the combustion products area and the geometric perturbation of the instantaneous combustion front (flame), distorting the shape of its surface, is also specified. That is the characteristic feature of the presented physical model. The mathematical eigenvalue problem is set and solved. This problem is reduced to an algebraic characteristic equation for a dimensionless complex eigenvalue, which positivity determines the instability. It is proved that in the limiting case of the absence of a liquid phase, absolute instability takes place. At the other limiting case-for perturbations with infinite wavelength-a transition to stability takes place. The latter fact indicates that the presence of a viscous liquid film and changes in the length of the gasification zone under the influence of perturbations have a significant stabilizing effect on solid fuel combustion. In the general case, a sufficient condition for the instability of the roots of the characteristic equation is analytically determined. The physical interpretation of the mathematical results explains the processes of autoturbulization of solid fuel combustion and the possible transition of combustion to deflagration explosion or detonation. The results of the study are in qualitative agreement with experimental data and can additionally be used for theoretical analysis of the stability of the liquid fuel combustion process in the combustion chamber

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