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Experiments of premixed syngas-air explosion inside a parallel narrow channels are conducted. The flame propagation, explosion pressure and temperature inside the narrow channel are investigated to find out the effect of narrow channel spacing on the explosion.
(1) As the narrow channel spacing decreasing, the flame front shape before the entrance of narrow channel changes from a normal finger shape for channel spacing 1.0 mm to a flattened shape for channel spacing 0.3 mm. In the narrow channel, the flame inherits the flame front pattern at the front of the narrow channel entrance, and then develops. The tulip flame inside the narrow channel is observed for channel spacing 1 mm. While a variant tulip flame appears only at the end of the narrow channel for spacing 0.5 mm. With the decrease of the narrow channel spacing, the flame following after the flame front within the narrow channel becomes dimmer and may even quench, which is because the heat generated by explosion is insufficient to offset the heat absorbed by the cold wall. The flame inside the narrow channels accelerates and reaches a peak value at the middle or rear of the channel. The flame front velocity decreases as the channel spacing decreasing.
(2) As the narrow channel spacing decreasing, the maximum explosion pressure Pmax and the maximum explosion pressure rise rate (dP/dt)max decrease due to the explosion inside the channel being weakened by the channel walls. Pmax in the back end of the narrow channel is larger than that in the front end, as well as (dP/dt)max.
(3) The explosion flame temperature inside the narrow channels rises rapidly from initial value to the maximum explosion flame temperature (Tmax), and then declines with fluctuation due to the flame passing back into the narrow channels from the buffer pipe. The explosion flame temperature and explosion flame temperature rise rate decrease with decrease of channel spacing.
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Cite this article
Guo P, Xu C, Lu J, Wang Z, Chang X, et al. 2023. Study on the effect of channel spacing on premixed syngas-air explosion inside parallel narrow channels. Emergency Management Science and Technology 3:8 doi: 10.48130/EMST-2023-0008
Study on the effect of channel spacing on premixed syngas-air explosion inside parallel narrow channels
- Received: 15 May 2023
- Accepted: 28 June 2023
- Published online: 27 July 2023
Abstract: Experiments of premixed syngas/air explosion inside parallel narrow channels were conducted. The flame propagation, explosion pressure and temperature inside the narrow channel are investigated to find out the effect of narrow channel spacing on the explosion. The experimental results show that the narrow channel spacing has an influence on the flame before and inside the parallel narrow channels. The flame inside the narrow channels accelerates and reaches a peak value at the middle or rear of the channel. The flame front velocity, the maximum explosion Pmax and the maximum explosion flame temperature Tmax decrease as the channel spacing decreases. The channel wall has an effect of heat dissipation on the flame, resulting in the explosion inside the channel weakening. The explosion pressure in rear of the narrow channel is larger than that in the front of the narrow channel.
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Key words:
- Syngas explosion /
- Parallel narrow channel /
- Flame propagation /
- Pressure /
- Temperature