Experimental study of dispersal and cloud explosion of a new micro-emulsified diesel fuel and its explosion suppression performance assessment

HUANG Yong; XIE Lifeng; ZHANG Hongwei; LU Changbo; AN Gaojun; XIONG Chunhua; CHEN Qun

doi:10.11883/bzycj-2017-0457

Volume 39 Issue 3

Mar. 2019

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HUANG Yong, XIE Lifeng, ZHANG Hongwei, LU Changbo, AN Gaojun, XIONG Chunhua, CHEN Qun. Experimental study of dispersal and cloud explosion of a new micro-emulsified diesel fuel and its explosion suppression performance assessment[J]. Explosion And Shock Waves, 2019, 39(3): 035401. doi: 10.11883/bzycj-2017-0457

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Experimental study of dispersal and cloud explosion of a new micro-emulsified diesel fuel and its explosion suppression performance assessment

doi: 10.11883/bzycj-2017-0457

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
3.
Beijing POL Research Institute, Beijing 102300, China
4.
School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China

Received Date: 2017-12-29
Rev Recd Date: 2018-05-20

Available Online: 2019-03-25

Publish Date: 2019-03-01

Abstract

Abstract

To find out about the explosion suppression performance and mechanism of a new micro-emulsified diesel fuel, we carried out experiments on the dispersal and cloud explosion of −10# diesel fuel, ordinary micro-emulsified diesel fuel and new micro-emulsified diesel fuel. We calculated the average temperature at the maximum surface temperature, the high temperature duration (longer than 1 273.15 K), the maximum cross-sectional area and the radiant emittance of the cloud explosion fireballs of diesel fuel samples and evaluated them using the grey correlation analysis method and studied the dispersal atomization phenomena and explosion suppression mechanisms of the diesel fuel samples under the shock wave and high-speed airflow using the liquid fuel dispersal and imaging system. The results showed that the cloud radial expansion radius and the characteristic parameters of the explosion fireball of the new micro-emulsified diesel fuel were obviously lower than those of −10# diesel fuel and ordinary micro-emulsified diesel fuel. For example, the maximum surface mean temperatures of the fireballs of the new micro-emulsified diesel fuel samples made up by mixing 0.2% or 0.4% high polymer antifogging agents into the fuel containing 5% water were 296.90 and 336.90 K lower than those of −10# diesel fuel. Their high temperature duration is shorter by 94 and 234 ms respectively. The maximum cross-sectional areas of their fireballs were only 60.10% and 53.53% that of −10# diesel fuel respectively. The explosion power of the new micro-emulsified diesel fuel was the lowest and the explosion suppression performance was the best, followed by ordinary micro-emulsified diesel fuel and −10# diesel fuel. When the water mass fraction of the micro-emulsified diesel fuel was less than 15%, the explosion suppression effect of the micro-emulsified diesel fuel with an addition of 10% water was equivalent to that with an addition of 0.2% antifogging agents. The key for this better explosion suppression performance was that the viscosity and elasticity of the droplets increased due to the addition of antifogging agents to the diesel fuel, and that the droplets were not apt to be broken and atomized under the shearing action of high-speed airflow, and the dispersion of the droplets was not effective.
- new micro-emulsified diesel fuel,
- dispersal,
- explosion fireball,
- explosion suppression performance

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