Large eddy simulation of gasoline/air mixture explosion in a semi-confined space with bilateral branches

LIU Chong; DU Yang; LIANG Jianjun; ZHANG Peili; MENG Hong

doi:10.11883/bzycj-2019-0408

Volume 40 Issue 6

Jun. 2020

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LIU Chong, DU Yang, LIANG Jianjun, ZHANG Peili, MENG Hong. Large eddy simulation of gasoline/air mixture explosion in a semi-confined space with bilateral branches[J]. Explosion And Shock Waves, 2020, 40(6): 064202. doi: 10.11883/bzycj-2019-0408

Citation:

LIU Chong, DU Yang, LIANG Jianjun, ZHANG Peili, MENG Hong. Large eddy simulation of gasoline/air mixture explosion in a semi-confined space with bilateral branches[J]. Explosion And Shock Waves, 2020, 40(6): 064202. doi: 10.11883/bzycj-2019-0408

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Large eddy simulation of gasoline/air mixture explosion in a semi-confined space with bilateral branches

doi: 10.11883/bzycj-2019-0408

1.
Department of Petroleum Supply Engineering, Army Logistics University, Chongqing 401311, China
2.
Department of Service Command, Army Logistics University, Chongqing 401311, China

Received Date: 2019-10-23
Rev Recd Date: 2020-03-25
Publish Date: 2020-06-01

Abstract

Abstract

In order to study the gasoline/air mixture explosion characteristics in semi-confined spaces with branched structures, a large eddy simulation model based on WALE turbulence model and the Zimont premixed flame model was established. The explosion characteristics of semi-confined space with bilateral branches ware studied through the simulation. The applicability of the established model for the calculation of gasoline/air mixture explosion in semi-confined spaces with bilateral branches is verified by comparing of flame shape, flame propagation velocity and dynamic overpressure. The flow field, flame behavior and overpressure variation during the explosion process were analyzed through the numerical simulation results and the reasons for the formation of “splash-like” flame were pointed out, and the following results were obtained. (1) Before the flame propagates into the branch pipes, two symmetric vortex structure with opposite rotation directions are generated at the junctions of the main pipe and two branch pipes, and develop toward the inside of the branch pipes as the flame propagates continuously. (2) When the flame propagates into branch pipes, the flow field established in the early stage determines the shape of the flame. The flame front forms a “splash-like” flame under the action of the vortex structure. After that, the flame and the flow field interact with each other turning to the turbulent flow and distorted flame front. (3) The growing process of the overpressure can be divided into four stages, which are influenced by the flame front area and the branch pipe pressure unload, indicating that the explosion flow field, flame behavior and dynamic overpressure have significant coupling effects.
- branch structure,
- gasoline/air mixture explosion,
- flow field characteristics,
- flame behavior,
- overpressure characteristic

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References(22)

References

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