Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube

Gao Wei; Abe Shuntaro; Rong Jian-zhong; Dobashi Ritsu

doi:10.11883/1001-1455-(2015)03-0372-08

Volume 35 Issue 3

Jun. 2015

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Gao Wei, Abe Shuntaro, Rong Jian-zhong, Dobashi Ritsu. Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube[J]. Explosion And Shock Waves, 2015, 35(3): 372-379. doi: 10.11883/1001-1455-(2015)03-0372-08

Citation:

Gao Wei, Abe Shuntaro, Rong Jian-zhong, Dobashi Ritsu. Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube[J]. Explosion And Shock Waves, 2015, 35(3): 372-379. doi: 10.11883/1001-1455-(2015)03-0372-08

Citation:

Gao Wei, Abe Shuntaro, Rong Jian-zhong, Dobashi Ritsu. Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube[J]. Explosion And Shock Waves, 2015, 35(3): 372-379. doi: 10.11883/1001-1455-(2015)03-0372-08

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Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube

doi: 10.11883/1001-1455-(2015)03-0372-08

1.
School of Chemical Machinery, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
Department of Chemical System Engineering School of Engineering, University of Tokyo, Tokyo 113-8656, Japan
3.
Sichuan Fire Research Institute of Ministry of Public Security, Chengdu 610036, Sichuan, China

Received Date: 2013-07-08
Rev Recd Date: 2014-06-03
Publish Date: 2015-05-25

Abstract

Abstract

Experiments were conducted to investigate the effect of conveying airflow characteristics on flame structure for the electric spark ignition in air flow of lycopodium dust.Hot wire anemometers were used to measure the distributions of velocity and turbulent intensity along the diameter in a 6 cm diameter and 4 m length horizontal acrylic tube of a blow-type pneumatic conveying system.The measured dust-air mixtures flowing velocities ranged between 10 and 30 m/s.A high-speed video camera was utilized to record the flame propagation process and to obtain the direct light emission photographs.Two apparently different types of flames appeared in the flame propagation process under different airflow conditions.Type A flame was characterized by a regular and continuous structure with the yellow light-emitting zone in the center surrounding by the red luminous zone.Type B flame was discrete in the space and the structure of the luminous zone was irregular.Furthermore, the flame propagation velocities, vortex structures, formation conditions and relative burning velocities of the two types flames under different airflow velocities were discussed in detail.
- mechanics of explosion,
- dust explosion,
- pneumatic transportation,
- air flow characteristics,
- flame structure,
- flame propagation velocity

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References(20)

References

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