A sub-step calculation model of gas explosion venting pressure and its turbulent correction

SUN Song; GAO Kanghua; QIU Yanyu; WANG Mingyang

doi:10.11883/bzycj-2017-0399

Volume 39 Issue 5

May 2019

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SUN Song, GAO Kanghua, QIU Yanyu, WANG Mingyang. A sub-step calculation model of gas explosion venting pressure and its turbulent correction[J]. Explosion And Shock Waves, 2019, 39(5): 054203. doi: 10.11883/bzycj-2017-0399

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SUN Song, GAO Kanghua, QIU Yanyu, WANG Mingyang. A sub-step calculation model of gas explosion venting pressure and its turbulent correction[J]. Explosion And Shock Waves, 2019, 39(5): 054203. doi: 10.11883/bzycj-2017-0399

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A sub-step calculation model of gas explosion venting pressure and its turbulent correction

doi: 10.11883/bzycj-2017-0399

State Key Laboratory for Explosion & Impact and Disaster Prevention & Mitigation, Army Engineering University, Nanjing 210007, Jiangsu, China

Received Date: 2017-11-06
Rev Recd Date: 2018-01-09

Available Online: 2019-07-25

Publish Date: 2019-05-01

Abstract

Abstract

By differentiating the explosion venting process in a confined space, the process in each step was assumed to develop in three independent sub-steps: combustion, venting and equilibrium, and a sub-step calculation model was obtained for gas explosion venting pressure. In order to verify the calculation model, the vented explosion experiments were carried out in a 2 m×1.2 m×0.6 m chamber, in which was mounted on two kinds of venting components with the same burst pressure and different venting areas. The results show that: in the case of large-size venting, only one peak overpressure was measured and the pressure curves recorded by the pressure transducers T1 and T2 were nearly overlapping. In this condition, the pressure values by the model agree well with the test data. In the case of small-size venting, double-peak pressure curves were recorded. The second peak measured by the pressure transducer T1 near the vent is larger than that measured by the pressure transducer T2 in the chamber as a result of pressure gradient, which is caused by the turbulent distortion due to the change of the flow cross section. The calculation model under turbulent velocity correction can well describe the pressure change near the vent.
- gas explosion venting pressure,
- sub-step calculation model,
- explosion venting,
- turbulent correction,
- confined space

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References(21)

References

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