Numerical studies of the erosional combustion of condensed matter

Bulgakov, V. K.; Lipanov, A. M.; Kamaletdinov, A. Sh.

doi:10.1007/bf00751879

Cited by 2 publications

(6 citation statements)

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“…The phenomenon of negative erosion, i.e., a decrease in the burning rate at low blowing velocities has been studied experimentally [46,47] and theoretically [45,46,[48][49][50]. Plausible explanations of the effect have been proposed for EM combustion with the gas phase controlling the burning rate.…”

Section: Possible Explanation Of the Negative Erosion Effectmentioning

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: Possible Explanation Of the Negative Erosion Effectmentioning

confidence: 99%

Erosive burning. Modeling problems

Gusachenko

Зарко

2007

Combust Explos Shock Waves

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“…We note that, using the scheme of solution of the erosive burning problem proposed above, it is possible to obtain all results [2,15] of numerical modeling that confirm the validity of the representation of the erosive burning rate as of a function of the shearing friction stress τ s or the ratio (x f − x s )/δ g since this ratio is directly related to τ s .…”

Section: Comparison Of Theoretical and Experimental Resultsmentioning

confidence: 85%

“…The ratio (x f −x s )/δ g = Θ is a new criterial parameter introduced in [2,15]. Its critical value, according to (4), is equal to unity.…”

Section: Comparison Of Theoretical and Experimental Resultsmentioning

confidence: 99%

“…The universal and key role of the ratio of these characteristic length scales in the description of the erosive burning mechanism is shown in [2,15]. In the present work, unlike in the studies cited above, the following model of the erosion process is adopted.…”

Section: Calculation Of Parameters Of Erosive Burning (Positive Erosion)mentioning

confidence: 98%

“…In the consideration of the physical picture of erosive burning, the most important is the ratio of the thickness of the combustion zone with no turbulence x f − x s to the thickness of the laminar (viscous) sublayer of the turbulent boundary layer [2,15]. The universal and key role of the ratio of these characteristic length scales in the description of the erosive burning mechanism is shown in [2,15].…”

Section: Calculation Of Parameters Of Erosive Burning (Positive Erosion)mentioning

confidence: 99%

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On the threshold nature of erosive burning

Сабденов

2008

Combust Explos Shock Waves

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A physical explanation for the existence of the threshold of erosive burning is proposed. It is shown that this type of combustion occurs when the thickness of the laminar sublayer in the turbulent boundary layer becomes smaller than the thickness of the laminar combustion zone. In this case, turbulent flame in the gas phase is formed. Relations are obtained linking the critical (threshold) velocity of the blowing flow and the critical Vilyunov number to the properties of the propellant and the gas resulting from propellant decomposition. Simple exponential dependences on the blowing velocity are found for the burning rate. The simplest representation of the erosive burning rate is obtained using the Bulgakov-Lipanov number, whose threshold value is equal to unity. A new mechanism for the occurrence of negative erosion is proposed, according to which the burning rate decreases during blowing because the boundary layer is displaced, resulting in a decrease in the heat flux from the flame zone to the solid-phase decomposition surface.

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Numerical studies of the erosional combustion of condensed matter

Cited by 2 publications

References 0 publications

Erosive burning. Modeling problems

Erosive burning. Modeling problems

On the threshold nature of erosive burning

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