Dynamics of cellular flame deformation after a head-on interaction with a shock wave: reactive Richtmyer–Meshkov instability

Yang, Hongxia; Radulescu, Matei I.

doi:10.1017/jfm.2021.594

Cited by 16 publications

(8 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Treating the various gasdynamic waves (shock, flames, contact surfaces and expansion waves) as gasdynamic discontinuities over which the jump conditions apply, the state behind the flame was obtained [6]. Near the reflecting wall the gas speed is zero, consistent with the vertical streaks in Fig.…”

Section: Methodsmentioning

confidence: 70%

“…The image sequence was recorded using a high-speed camera (Phantom v1210) with a frame rate of 59590 frames per second and an exposure time of 0.468µs. More details can be found in [6].…”

Section: Methodsmentioning

confidence: 99%

“…In the present communication, we wish to elucidate quantitatively why the transition to detonations in these previously reported experiments [6] was possible, in spite of the low sensitivity of the fuel-air mixture at the low pressures studied, small channel dimension, weak shock used, and absence of turbulence. As it will be shown, the thinness of the channel played the key role, by permitting highly strained flames by the anchoring mechanism of Gamezo [10,11].…”

Section: Introductionmentioning

confidence: 91%

“…The problem of shock-flame interactions has attracted much interest, as it is believed to control the transition of deflagrations to detonations (DDT) [1][2][3][4][5][6]. The passage of a shock over the flame provides distortion of the flame front by the Richtmyer-Meshkov instability.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the authors [6] have revisited this fundamental problem of shock-flame interaction by attempting to simplify the geometry studied by Thomas, Rakotoarison and their collaborators [1,4,5]. Instead of a spherical flame studied by Thomas leading to a highly convoluted turbulent flame, they considered a planar flame, such that the head-on interaction of a shock and the flame retains the macro-scale one-dimensionality of the problem.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhanced DDT mechanism from shock-flame interactions in thin channels

Yang

Radulescu

2019

Preprint

Self Cite

View full text Add to dashboard Cite

We show experimentally and numerically that when a weak shock interacts with a finger flame in a narrow channel, an extremely efficient mechanism for deflagration to detonation transition occurs. This is demonstrated in a 19mm-thick channel in hydrogen-air mixtures at pressures below 0.2 atm and weak shocks of Mach numbers 1.5 to 2. The mechanism relies primarily on the straining of the flame shape into an elongated alligator flame maintained by the anchoring mechanism of Gamezo in a bifurcated lambda shock due to boundary layers. The mechanism can increase the flame surface area by more than two orders of magnitude without any turbulence on the flame time scale.The resulting alligator-shaped flame is shown to saturate near the Chapman-Jouguet condition and further slowly accelerate until its burning velocity reaches the sound speed in the shocked unburned gas. At this state, the lead shock and further adiabatic compression of the gas in the induction zone gives rise to auto-ignition and very rapid transition to detonation through

show abstract

Section: Methodsmentioning

confidence: 70%

“…The image sequence was recorded using a high-speed camera (Phantom v1210) with a frame rate of 59590 frames per second and an exposure time of 0.468µs. More details can be found in [6].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced DDT mechanism from shock-flame interactions in thin channels

Yang

Radulescu

2019

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Topologies of flow and combustion in shock–flame interactions

Wang

Dong

2022

Shock Waves

View full text Add to dashboard Cite

Asymmetry of imploding detonations in thin channels

Rodriguez Rosero,

Loiseau,

Higgins

2024

Shock Waves

View full text Add to dashboard Cite

The factors that influence the symmetry of an imploding detonation are investigated experimentally and theoretically. Detonations in sub-atmospheric acetylene-oxygen were initiated and made to converge in an apparatus that followed that of Lee and Lee (Phys. Fluids 8:2148-2152(1965). The width of the test section was controlled with a wave-shaping insert, which formed the test section against the viewing window, creating an effectively two-dimensional problem with a channel width comparable to the detonation cell size. The convergence of the detonation was observed via self-luminous open-shutter photography and high-speed videography. The resulting videos were analyzed to quantify the wave speed, degree of asymmetry, and direction and magnitude of the offset in the center of convergence. To determine the experimental parameters that influence the symmetry of the imploding wave, the wave-shaping insert was intentionally canted by 0.3-0.6°, accentuating the asymmetry of the imploding detonation. The experiment was modeled using a Huygens construction wherein the detonation is treated as a collection of wavelets, each assumed to propagate locally at a velocity determined by the channel width. The results of the model reproduced the observed offsets in detonation convergence from the center of the apparatus, confirming that velocity deficits resulting from the narrow channel width control the observed asymmetry.

show abstract

Dynamics of cellular flame deformation after a head-on interaction with a shock wave: reactive Richtmyer–Meshkov instability

Abstract: Abstract

Cited by 16 publications

References 38 publications

Enhanced DDT mechanism from shock-flame interactions in thin channels

Enhanced DDT mechanism from shock-flame interactions in thin channels

Topologies of flow and combustion in shock–flame interactions

Asymmetry of imploding detonations in thin channels

Contact Info

Product

Resources

About