Initiation of detonation in various gas mixtures

Pawel, D.; Tiggelen, P.J. Van; Vasatko, H.; Wagner, H. Gg.

doi:10.1016/0010-2180(70)90028-3

“…11. Pre-detonation length versus initial temperature for a stoichiometric hydrogen-air mixture: 1) smooth tunnel; 2) tunnel with four cavities; 3) experimental data [41,42] obtained in smooth tunnels.…”

Section: Discussionmentioning

confidence: 99%

“…For comparison, Fig. 11 also shows the experimental data [41,42] on the deflagration-to-detonation transition in smooth tunnels.…”

Section: Effect Of Ignition Conditions and Initial Temperature On Thementioning

confidence: 97%

Transitional regimes of wave propagation in metastable systems

Смирнов

¹

,

Никитин

²

,

Alyari-Shourekhdeli

³

2008

Combust Explos Shock Waves

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“…In a spark-ignited stoichiometric hydrogen-oxygen mixture in a smooth-walled tube of D = 26 mm, Pawel et al [14] observed the DDT transition at 40D. Shchelkin and Troshin [15] regarded the value of 1900 m s −1 as typical for a detonation of the stoichiometric hydrogenair mixture.…”

Section: Discussionmentioning

confidence: 99%

“…The smaller the cross section of the detonation channel, the lower the detonation speed and the longer DDT length. In the CH 4 -O 2 mixture, the DDT position changes from 58D to 32D for diameters in the range 12-50 mm [3,14,16].…”

Section: Discussionmentioning

confidence: 99%

Molecular Weight Dependence of Dielectric Behavior of Polymer Electrolytes under Shear Flow

Inoue

¹

,

Kimura

²

,

Ito

³

et al. 1999

Jpn. J. Appl. Phys.

1

0

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By using spline polynomials with free nodal points, the propagation of a flame front and its velocity in a long pipe is reconstructed from incomplete and only relative data produced by optical sensors. The proposed method of reconstruction is illustrated by processing of results obtained for a stoichiometric hydrogen-air mixture (1 bar, ambient temperature) ignited by a single hot wire in a smooth-walled detonation tube (diameter D = 110 mm; length 21 m). The optimum nodal points of the splines (15D, 85D and 100D) divide the piping into four physically different parts. A stationary detonation velocity 2028 ± 7 m s −1 from position 100D and a maximum velocity about 2590 m s −1 at 85D are observed. (A neglect of the predetonation excess velocity provides only a misleading mean detonation speed 2098 ± 9 m s −1 from 67D.) Using the theory of experimental design, the minimum number (11) and optimum positions of monitoring sensors within the characteristic regions of the whole pipe are calculated. With respect to the complexity of the deflagration-to-detonation transition, also the optimum distribution of 16 sensors is discussed.

show abstract

“…In a spark-ignited stoichiometric hydrogen-oxygen mixture in a smooth-walled tube of D = 26 mm, Pawel et al [14] observed the DDT transition at 40D. Shchelkin and Troshin [15] regarded the value of 1900 m s −1 as typical for a detonation of the stoichiometric hydrogenair mixture.…”

Section: Discussionmentioning

confidence: 99%

The optimum experimental design for reconstruction of flame-front propagation in a long pipe

Hajossy¹,

Morva²

1998

Meas. Sci. Technol.

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By using spline polynomials with free nodal points, the propagation of a flame front and its velocity in a long pipe is reconstructed from incomplete and only relative data produced by optical sensors. The proposed method of reconstruction is illustrated by processing of results obtained for a stoichiometric hydrogen-air mixture (1 bar, ambient temperature) ignited by a single hot wire in a smooth-walled detonation tube (diameter D = 110 mm; length 21 m). The optimum nodal points of the splines (15D, 85D and 100D) divide the piping into four physically different parts. A stationary detonation velocity 2028 ± 7 m s −1 from position 100D and a maximum velocity about 2590 m s −1 at 85D are observed. (A neglect of the predetonation excess velocity provides only a misleading mean detonation speed 2098 ± 9 m s −1 from 67D.) Using the theory of experimental design, the minimum number (11) and optimum positions of monitoring sensors within the characteristic regions of the whole pipe are calculated. With respect to the complexity of the deflagration-to-detonation transition, also the optimum distribution of 16 sensors is discussed.

show abstract

Initiation of detonation in various gas mixtures

Cited by 24 publications

References 4 publications

Transitional regimes of wave propagation in metastable systems

Transitional regimes of wave propagation in metastable systems

Molecular Weight Dependence of Dielectric Behavior of Polymer Electrolytes under Shear Flow

The optimum experimental design for reconstruction of flame-front propagation in a long pipe

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