Visualization experimental research of oil gas vapor cloud deflagration in large-scale unconfined space

LI Jingye; JIANG Xinsheng; YU Binbin; WANG Chunhui; WANG Zituo

doi:10.11883/bzycj-2021-0176

Volume 42 Issue 3

Apr. 2022

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LI Jingye, JIANG Xinsheng, YU Binbin, WANG Chunhui, WANG Zituo. Visualization experimental research of oil gas vapor cloud deflagration in large-scale unconfined space[J]. Explosion And Shock Waves, 2022, 42(3): 035401. doi: 10.11883/bzycj-2021-0176

Citation:

LI Jingye, JIANG Xinsheng, YU Binbin, WANG Chunhui, WANG Zituo. Visualization experimental research of oil gas vapor cloud deflagration in large-scale unconfined space[J]. Explosion And Shock Waves, 2022, 42(3): 035401. doi: 10.11883/bzycj-2021-0176

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Visualization experimental research of oil gas vapor cloud deflagration in large-scale unconfined space

doi: 10.11883/bzycj-2021-0176

Department of Oil, Army Logistical University, Chongqing 401331, China

Received Date: 2021-05-08
Rev Recd Date: 2021-06-21

Available Online: 2022-02-19

Publish Date: 2022-04-07

Abstract

Abstract

An oil-gas deflagration simulation experimental condition system in the large-scale unconfined space was independently designed and built against the theoretical requirements for safety monitoring and controlling of oil-gas mixture explosions in large-scale unconfined spaces. To begin with, pressure and flame signals, variations in global temperature and radiation indicators in various areas of the system were accurately collected through sensors, thermal imagers and radiometers. Also, high-speed cameras were adopted to capture the dynamic development of flames during deflagration, acquiring specific behavior characteristics of flame shape. The results show that the oil-gas combustion modes in the unconfined space can be divided into fireless gas cloud firing, oil-gas combustion with open flame, and oil-gas deflagration with compression wave, according to the differences in initial oil-gas concentration. To be specific, the flame generated from oil-gas deflagration is in the mirror-image shape of “L”, which can be found in the infield of the bench as well as behind and right above the ignition surface. Moreover, several peaks can be found in the dynamic overpressure sequence development curve. Based on the peak type, the whole deflagration process can be partitioned into stable spread, flame bleeding, and burning collapse. Specifically, the high-intensity area of deflagration flame could be primarily observed at the 1/3 to 2/3 of the bench, with the peak reaching up to 4816.03 mV. It can be observed that the flame is principally presented in blue and orange, and the flame speed is downward in fluctuation along with the deflagration process. It can also be coupled with the overpressure development stage. After that, the overpressure peak is presented in a trend of first decreasing and then increasing along with the increase in the initial oil-gas concentration, whereas time consumed in peak forming is displayed in an opposite law. Note that both can fitted using the cubic polynomial. Besides, temperature gradient of deflagration flames is associated with the flame heading, and the temperature gradient of the flame front surface is typically smaller than that of the tail flame. What’s more, the formation time of radiation peak of deflagration has a certain delay in comparison to the flame intensity, causing that high-intensity radiation can be easily formed at the end of deflagration spreading. To sum up, key parameter supports and theoretical bases are provided for the online monitoring and explosion suppression of oil gas cloud deflagration in the large-scale unconfined space, presenting a significance in guiding the research and development of explosion suppression equipment.

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References

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