Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels

Yuefei Xiong, Hung Ping Chan, Ming-Hsun Wu, Jiang Qin, Chien Fu Chen

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

The effect of channel size and equivalence ratio of ethylene/oxygen mixtures on detonation velocity deficits were experimentally investigated in miniature square channels in this paper. The premix mixtures were spark ignited under ambient pressure and temperature, and detonation waves were formed through deflagration-to-detonation transition (DDT) process in the smooth and straight channel in which no cross-sectional area change existed. The reaction wave in the small channels went through flame acceleration, detonation transition, and overdriven detonation before stably propagated along the chanel at a value lower than the Chapman-Jouguet velocity. As the channel size decreased from 1.2 mm to 0.6 mm, both DDT time and DDT distance reduced while the detonation velocity deficit increased. In the 0.8 mm channel, the propagation speed of detonation wave dropped after a certain distance after detonation transition, and then fluctuated around a new value. Low-speed detonation mode appeared when the channel size was 0.6 mm. Moreover, the detonation velocity deficit gradually increased with the decrease of equivalence ratio within the test range. Non-dimensional detonation velocities V/VCJ becomes invariant as non-dimensional number DH/λ is larger than 1.4. But the deficit is not only a function of DH/λ for near-limit conditions when the channel dimension approaches or becomes smaller than the cell size.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
Event11th Asia-Pacific Conference on Combustion, ASPACC 2017 - Sydney, Australia
Duration: 2017 Dec 102017 Dec 14

Other

Other11th Asia-Pacific Conference on Combustion, ASPACC 2017
CountryAustralia
CitySydney
Period17-12-1017-12-14

Fingerprint

detonation waves
Detonation
detonation
deflagration
equivalence
test ranges
sparks
low speed
flames
Electric sparks
ethylene
Ethylene

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)

Cite this

Xiong, Y., Chan, H. P., Wu, M-H., Qin, J., & Chen, C. F. (2017). Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels. Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia.
Xiong, Yuefei ; Chan, Hung Ping ; Wu, Ming-Hsun ; Qin, Jiang ; Chen, Chien Fu. / Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels. Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia.
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abstract = "The effect of channel size and equivalence ratio of ethylene/oxygen mixtures on detonation velocity deficits were experimentally investigated in miniature square channels in this paper. The premix mixtures were spark ignited under ambient pressure and temperature, and detonation waves were formed through deflagration-to-detonation transition (DDT) process in the smooth and straight channel in which no cross-sectional area change existed. The reaction wave in the small channels went through flame acceleration, detonation transition, and overdriven detonation before stably propagated along the chanel at a value lower than the Chapman-Jouguet velocity. As the channel size decreased from 1.2 mm to 0.6 mm, both DDT time and DDT distance reduced while the detonation velocity deficit increased. In the 0.8 mm channel, the propagation speed of detonation wave dropped after a certain distance after detonation transition, and then fluctuated around a new value. Low-speed detonation mode appeared when the channel size was 0.6 mm. Moreover, the detonation velocity deficit gradually increased with the decrease of equivalence ratio within the test range. Non-dimensional detonation velocities V/VCJ becomes invariant as non-dimensional number DH/λ is larger than 1.4. But the deficit is not only a function of DH/λ for near-limit conditions when the channel dimension approaches or becomes smaller than the cell size.",
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Xiong, Y, Chan, HP, Wu, M-H, Qin, J & Chen, CF 2017, 'Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels', Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia, 17-12-10 - 17-12-14.

Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels. / Xiong, Yuefei; Chan, Hung Ping; Wu, Ming-Hsun; Qin, Jiang; Chen, Chien Fu.

2017. Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia.

Research output: Contribution to conferencePaper

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N2 - The effect of channel size and equivalence ratio of ethylene/oxygen mixtures on detonation velocity deficits were experimentally investigated in miniature square channels in this paper. The premix mixtures were spark ignited under ambient pressure and temperature, and detonation waves were formed through deflagration-to-detonation transition (DDT) process in the smooth and straight channel in which no cross-sectional area change existed. The reaction wave in the small channels went through flame acceleration, detonation transition, and overdriven detonation before stably propagated along the chanel at a value lower than the Chapman-Jouguet velocity. As the channel size decreased from 1.2 mm to 0.6 mm, both DDT time and DDT distance reduced while the detonation velocity deficit increased. In the 0.8 mm channel, the propagation speed of detonation wave dropped after a certain distance after detonation transition, and then fluctuated around a new value. Low-speed detonation mode appeared when the channel size was 0.6 mm. Moreover, the detonation velocity deficit gradually increased with the decrease of equivalence ratio within the test range. Non-dimensional detonation velocities V/VCJ becomes invariant as non-dimensional number DH/λ is larger than 1.4. But the deficit is not only a function of DH/λ for near-limit conditions when the channel dimension approaches or becomes smaller than the cell size.

AB - The effect of channel size and equivalence ratio of ethylene/oxygen mixtures on detonation velocity deficits were experimentally investigated in miniature square channels in this paper. The premix mixtures were spark ignited under ambient pressure and temperature, and detonation waves were formed through deflagration-to-detonation transition (DDT) process in the smooth and straight channel in which no cross-sectional area change existed. The reaction wave in the small channels went through flame acceleration, detonation transition, and overdriven detonation before stably propagated along the chanel at a value lower than the Chapman-Jouguet velocity. As the channel size decreased from 1.2 mm to 0.6 mm, both DDT time and DDT distance reduced while the detonation velocity deficit increased. In the 0.8 mm channel, the propagation speed of detonation wave dropped after a certain distance after detonation transition, and then fluctuated around a new value. Low-speed detonation mode appeared when the channel size was 0.6 mm. Moreover, the detonation velocity deficit gradually increased with the decrease of equivalence ratio within the test range. Non-dimensional detonation velocities V/VCJ becomes invariant as non-dimensional number DH/λ is larger than 1.4. But the deficit is not only a function of DH/λ for near-limit conditions when the channel dimension approaches or becomes smaller than the cell size.

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Xiong Y, Chan HP, Wu M-H, Qin J, Chen CF. Experimental study on velocity deficits of near-limit detonation waves initiated in narrow channels. 2017. Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia.