The evolution of free turbulent spherical gas flames and the generalized Kolmogorov-Obukhov laws

Gostintsev, Yu. A.; Shatskikh, Yu. V.; Shulenin, Yu. V.; Фортов, В. Е.

doi:10.1134/s1990793108030172

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Here we elucidate the conceptual difference between the recent work of Gostintsev et al [29] and the present formulation, with much stronger flame acceleration in the latter than that in the former. The essential point to note is that the two studies are concerned with two completely different physical situations; namely, the study of Ref.…”

Section: Turbulent Flame Formulationmentioning

confidence: 45%

“…(18) shows much stronger flame acceleration than that for the freely propagating laminar flames with the suggested acceleration exponent α being reported to fall in the range α = 1.25 − 1.5 [12,[28][29][30]. This result therefore predicts a much earlier transition to detonation in the present turbulent environment than that in a quiescent laminar one; see Sec.…”

Section: Turbulent Flame Formulationmentioning

confidence: 72%

“…The essential point to note is that the two studies are concerned with two completely different physical situations; namely, the study of Ref. [29] is devoted to a quiescent environment, with the vortical motion generated through inherent flame-front cellular instability, while in the present work turbulence is imposed, which in addition also allows for the flame-generated vorticity. The imposition of turbulence imitates the fan-generated turbulence in the experiments of Ref.…”

Section: Turbulent Flame Formulationmentioning

confidence: 99%

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Accelerative propagation and explosion triggering by expanding turbulent premixed flames

2013

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The dynamics and morphology of outwardly propagating, accelerating turbulent premixed flames and the effect of flame acceleration on explosion triggering are analyzed. Guided by recent theoretical results and substantiated by experiments, we find that an expanding flame front in an externally forced, near-isotropic turbulent environment exhibits accelerative propagation given by a well-defined power law based on the average global flame radius. In this context the limits of the power-law exponent and the effective turbulence intensity experienced by the flame are derived. The power-law exponent is found to be substantially larger than that for the hydrodynamically unstable cellular laminar flames, hence facilitating the possibility of detonation triggering in turbulent environments. For large length scales, hydrodynamic instability is expected to provide additional acceleration, thus further favoring the attainment of detonation triggering.

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Section: Turbulent Flame Formulationmentioning

confidence: 45%

Section: Turbulent Flame Formulationmentioning

confidence: 72%

Section: Turbulent Flame Formulationmentioning

confidence: 99%

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Accelerative propagation and explosion triggering by expanding turbulent premixed flames

2013

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“…Kolmogorov first discovered the 'two thirds law' in turbulent inertial sub-range [36], [37] which describes that the average of the square of differences from two points is proportional to two thirds power of the distance. Later, this relationship has been extended to passive conservative quantity by Oxygen.…”

Section: Effects From Atmospheric Turbelencementioning

confidence: 99%

The Impact of Atmospheric Turbulence on Terahertz Communication

2019

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The application prospect of terahertz (THz) has been vastly enriched because it has the advantages of good penetrating power, high security, accurate directionality, and high bandwidth. Moreover, it is found that the atmospheric instability which is caused by fluctuating temperature and humidity has a great influence on THz communication. Therefore, in this paper, we mainly study the atmospheric conditions, focusing on the impact of atmospheric turbulence on THz communication under consideration of inland areas. Initially, we deduce the variances of fluctuating amplitude and fluctuating phase. And afterward, the quantitative analysis is presented for the overall effects of turbulence on THz wave, which offers the standard deviation of the fluctuating waves. The theoretical model reasonably explains the phenomena of signal fluctuations caused by the turbulence, and these fluctuations increase with the increment in the distance discovered by D. Grischkowsky. At last, we consider the atmospheric turbulence as a specific type of additive noise to study the influence on THz communication and to predict the upper limit of bandwidth efficiency influenced by turbulence in different atmospheric conditions.

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