Reinitiation process of detonation wave behind a slit-plate

Obara, Tetsuro; Sentanuhady, Jayan; Tsukada, Yutaka; Ohyagi, Shigeharu

doi:10.1007/s00193-008-0147-9

Cited by 23 publications

(8 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar results can be found in Ref. 82. Khomik et al [83,84] studied the reinitiation process of hydrogen-air mixtures behind a multi-orifice plate.…”

Section: Detonationsupporting

confidence: 82%

“…In confined regions, detonations may take place after flame acceleration and DDT, propagating with a velocity below the CJ detonation velocity. The velocity deficit can be credited to the heat and momentum losses or detonation front curve [46,82,85]. As suggested by Lee [75], the deficits are seldom larger than 15% when the detonation fails in smooth tubes.…”

Section: Detonationmentioning

confidence: 95%

See 1 more Smart Citation

Flame quenching by crimped ribbon flame arrestor: A brief review

Wang

Shen

et al. 2018

Process Safety Progress

View full text Add to dashboard Cite

Accidental explosions in gas/oil pipelines remain one major concern in process industries. The crimped ribbon flame arrestor is an effective device to prevent flame propagation. This review summarizes existing knowledge on the quenching of flame of different regimes in narrow channels and crimped ribbon flame arrestors. The influences of various parameters (e.g., arrestor element thickness, expansion ratio, system pressure) on the performance of crimped ribbon flame arrestors are discussed. The presented discussions give a better understanding on the considerations which must be taken into account to quench an explosion successfully. Other scenarios, such as quenching of two-phase vapor-liquid explosions and overdriven detonations should be got further attention. Figure 18. The results of quenching ethylene/air/oxygen flames by a DN50 flame arrestor [114]. Black dot: flame quenched; red cross: flame not quenched. [Color figure can be viewed at wileyonlinelibrary.com]

show abstract

“…Similar results can be found in Ref. 82. Khomik et al [83,84] studied the reinitiation process of hydrogen-air mixtures behind a multi-orifice plate.…”

Section: Detonationsupporting

confidence: 82%

Section: Detonationmentioning

confidence: 95%

Flame quenching by crimped ribbon flame arrestor: A brief review

Wang

Shen

et al. 2018

Process Safety Progress

View full text Add to dashboard Cite

show abstract

“…The flow field established immediately behind the obstacles (the near field of the problem) has attracted much attention in recent years. Ohyagi et al and Teodorczyk et et al have focused on the conditions leading to the prompt re-initiation of the detonation from Mach reflections [11,12]. Radulescu and Maxwell [6] investigated the re-initiation of detonation waves downstream of a porous medium, which comprised a two-dimensional array of staggered cylinders.…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrodynamic instabilities on the propagation mechanism of fast flames

Maley

Bhattacharjee

Lau-Chapdelaine

et al. 2015

Proceedings of the Combustion Institute

View full text Add to dashboard Cite

The present work investigates the structure of fast supersonic turbulent flames typically observed as precursors to the onset of detonation. These high speed deflagrations are obtained after the interaction of a detonation wave with cylindrical obstacles. Two mixtures having the same propensity for local hot spot formation were considered, namely hydrogen-oxygen and methane-oxygen. It was shown that the methane mixture sustained turbulent fast flames, while the hydrogen mixture did not. Detailed high speed visualizations of nearly two-dimensional flow fields permitted to identify the key mechanism involved. The strong vorticity generation associated with shock reflections in methane permitted to drive jets. These provided local enhancement of mixing rates, sustenance of pressure waves, organization of the front in stronger fewer modes and eventually the transition to detonation. In the hydrogen system, for similar thermo-chemical parameters, the absence of these jets did not permit to establish such fast flames. This jetting slip line instability in shock reflections (and lack thereof in hydrogen) was correlated with the value of the isentropic exponent and its control of Mach shock jetting instability (Mach & Radulescu).

show abstract

“…These authors have also pointed out that mixing of hot reacted gases with colder un-reacted gases along the slip-line emanating from the triple points may also have a strong influence. Ohyagi et al [12] and Obara et al [13] also studied the diffraction and re-initiation events that take place behind backward facing steps. Their high-speed schlieren images and soot foils clearly indicated that re-initiation takes place behind the Mach stem.…”

Section: Introductionmentioning

confidence: 99%

Detonation re-initiation mechanism following the Mach reflection of a quenched detonation

Bhattacharjee

Lau-Chapdelaine

Maines

et al. 2013

Proceedings of the Combustion Institute

View full text Add to dashboard Cite

This experimental study addresses the re-initiation mechanism of detonation waves following the Mach reflection of a shock-flame complex. The detonation diffraction around a cylinder is used to reproducibly generate the shock-flame complex of interest. The experiments are performed in methane-oxygen. We use a novel experimental technique of coupling a two-in-line-spark flash system with a double-frame camera in order to obtain microsecond time resolution permitting accurate schlieren velocimetry. The first series of experiments compares the non-reactive sequence of shock reflections with the reflection over a rough wall under identical conditions. It was found that the hot reaction products generated along the rough wall are entrained by the wall jet into a large vortex structure behind the Mach stem. The second series of experiments performed in more sensitive mixtures addressed the sequence of events leading to the detonation establishment along the Mach and transverse waves. Following ignition and jet entrainment, a detonation first appears along the Mach stem while the transverse wave remains non-reactive. The structure of the unburned tongue however indicates local instabilities and hot spot formation, leading to the rapid reaction of this gas. Numerical simulations are also reported, confirming the sequence of ignition events obtained experimentally.

show abstract

Reinitiation process of detonation wave behind a slit-plate

Cited by 23 publications

References 15 publications

Flame quenching by crimped ribbon flame arrestor: A brief review

Flame quenching by crimped ribbon flame arrestor: A brief review

Influence of hydrodynamic instabilities on the propagation mechanism of fast flames

Detonation re-initiation mechanism following the Mach reflection of a quenched detonation

Contact Info

Product

Resources

About