Influence of pre-ignition turbulence intensity on <i>n</i>-pentane mists explosion

LIU Xueling; ZHANG Qi

doi:10.11883/bzycj-2017-0458

Volume 39 Issue 3

Mar. 2019

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LIU Xueling, ZHANG Qi. Influence of pre-ignition turbulence intensity on n-pentane mists explosion[J]. Explosion And Shock Waves, 2019, 39(3): 032101. doi: 10.11883/bzycj-2017-0458

Citation:

LIU Xueling, ZHANG Qi. Influence of pre-ignition turbulence intensity on n-pentane mists explosion[J]. Explosion And Shock Waves, 2019, 39(3): 032101. doi: 10.11883/bzycj-2017-0458

LIU Xueling, ZHANG Qi. Influence of pre-ignition turbulence intensity on n-pentane mists explosion[J]. Explosion And Shock Waves, 2019, 39(3): 032101. doi: 10.11883/bzycj-2017-0458

Citation:

LIU Xueling, ZHANG Qi. Influence of pre-ignition turbulence intensity on n-pentane mists explosion[J]. Explosion And Shock Waves, 2019, 39(3): 032101. doi: 10.11883/bzycj-2017-0458

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Influence of pre-ignition turbulence intensity on n-pentane mists explosion

doi: 10.11883/bzycj-2017-0458

LIU Xueling^1
,,
ZHANG Qi²

1.
School of Mining Engineering, Guizhou Institute of Technology, Guiyang, 550003, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2017-12-29
Rev Recd Date: 2018-03-10

Available Online: 2019-03-25

Publish Date: 2019-03-01

Abstract

Abstract

In this paper we investigated the influence of the pre-ignition turbulence intensity on the explosion parameters of n-pentane mists. By using 0.4, 0.6 and 0.8 MPa of pneumatic pressure spray, we obtained n-pentane mists with the Sauter mean diameter (SMD) of 21.21, 14.51 and 8.64 μm, and at the same time, the pre-ignition turbulence intensity under different pneumatic pressures. Then, in a 20 L mists explosion parameter measuring system for experimental research, we aquired the influence of the pre-ignition turbulence on the evaporation rate, the peak explosion overpressure, the explosion pressure rise rate and the ignition delay time of n-pentane mists. The results showed that, the average turbulence velocity of the enviromental fluid field was zero. The smaller the droplet size was, the more obvious was the increase of the evaporation rate of the mists with the increase of the turbulence intensity. At the same time, for the SMDs of 14.51 and 21.21 μm, the peak pressure and the maximum pressure rise rate increased more obviously with the SMD of 8.64 μm, and the explosion intensity was significantly strong, suggesting the existence of a transition range. For the SMDs in the range of 8−22 μm, the mean square turbulence velocity in 1.0−4.0 m/s was the low growth stage of the flame propagation delay time, whereas that in 4.0−6.2 m/s was the high growth stage. The turbulence intensity and the flame propagation delay time exhibited a linear growth in both stages.
- turbulence intensity,
- mist concentration,
- particle size of mists,
- explosive parameters,
- flame propagation

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References(26)

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