Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel

Hung Ping Chan, Wei Yen Su, Yi Chun Tseng, Ming-Hsun Wu

Research output: Contribution to conferencePaper

Abstract

High-speed schlieren and chemiluminescence visualizations were utilized to resolve the influence of equivalence ratio () on the evolvements of reaction and shock waves in a transparent channel filled with ethylene/oxygen mixtures initially at ambient temperature and pressure. Equivalence ratios of the mixtures ranged from 0.5 to 1.6. Cross-section of the square channel was 1 mm × 1 mm, and the total length was 730 mm. Reaction propagation in = 0.5 mixture terminated with low-speed detonation, while the reaction fronts in other cases eventually propagate at near Chapman-Jouguet velocities. The timings of leading shock formation, shock cluster formation as well as detonation transition were the earliest in the = 1.3 mixture. Leading shock velocity and peak acceleration rate of reaction front were the highest for the mixture. Schlieren visualizations also showed that the shock cluster structures, emerged when the reaction wave propagating velocity exceeds 1100 m/s and before detonation transition, are identical to the pattern of a low-speed detonation wave front.

Original languageEnglish
Publication statusPublished - 2019 Jan 1
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: 2019 Jul 12019 Jul 5

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
CountryJapan
CityFukuoka
Period19-07-0119-07-05

Fingerprint

Detonation
detonation
equivalence
flames
Ethylene
ethylene
Oxygen
shock
oxygen
low speed
Visualization
detonation waves
Chemiluminescence
chemiluminescence
wave fronts
Shock waves
ambient temperature
shock waves
time measurement
high speed

All Science Journal Classification (ASJC) codes

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

Cite this

Chan, H. P., Su, W. Y., Tseng, Y. C., & Wu, M-H. (2019). Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel. Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan.
Chan, Hung Ping ; Su, Wei Yen ; Tseng, Yi Chun ; Wu, Ming-Hsun. / Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel. Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan.
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Chan, HP, Su, WY, Tseng, YC & Wu, M-H 2019, 'Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel', Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan, 19-07-01 - 19-07-05.

Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel. / Chan, Hung Ping; Su, Wei Yen; Tseng, Yi Chun; Wu, Ming-Hsun.

2019. Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan.

Research output: Contribution to conferencePaper

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T1 - Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel

AU - Chan, Hung Ping

AU - Su, Wei Yen

AU - Tseng, Yi Chun

AU - Wu, Ming-Hsun

PY - 2019/1/1

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N2 - High-speed schlieren and chemiluminescence visualizations were utilized to resolve the influence of equivalence ratio () on the evolvements of reaction and shock waves in a transparent channel filled with ethylene/oxygen mixtures initially at ambient temperature and pressure. Equivalence ratios of the mixtures ranged from 0.5 to 1.6. Cross-section of the square channel was 1 mm × 1 mm, and the total length was 730 mm. Reaction propagation in = 0.5 mixture terminated with low-speed detonation, while the reaction fronts in other cases eventually propagate at near Chapman-Jouguet velocities. The timings of leading shock formation, shock cluster formation as well as detonation transition were the earliest in the = 1.3 mixture. Leading shock velocity and peak acceleration rate of reaction front were the highest for the mixture. Schlieren visualizations also showed that the shock cluster structures, emerged when the reaction wave propagating velocity exceeds 1100 m/s and before detonation transition, are identical to the pattern of a low-speed detonation wave front.

AB - High-speed schlieren and chemiluminescence visualizations were utilized to resolve the influence of equivalence ratio () on the evolvements of reaction and shock waves in a transparent channel filled with ethylene/oxygen mixtures initially at ambient temperature and pressure. Equivalence ratios of the mixtures ranged from 0.5 to 1.6. Cross-section of the square channel was 1 mm × 1 mm, and the total length was 730 mm. Reaction propagation in = 0.5 mixture terminated with low-speed detonation, while the reaction fronts in other cases eventually propagate at near Chapman-Jouguet velocities. The timings of leading shock formation, shock cluster formation as well as detonation transition were the earliest in the = 1.3 mixture. Leading shock velocity and peak acceleration rate of reaction front were the highest for the mixture. Schlieren visualizations also showed that the shock cluster structures, emerged when the reaction wave propagating velocity exceeds 1100 m/s and before detonation transition, are identical to the pattern of a low-speed detonation wave front.

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Chan HP, Su WY, Tseng YC, Wu M-H. Influence of equivalence ratio on flame acceleration and detonation transition of ethylene/oxygen mixture in a narrow channel. 2019. Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan.