Explosion pressure prediction considering the flame instabilities

LI Yanchao; BI Mingshu; GAO Wei

doi:10.11883/bzycj-2019-0004

Volume 40 Issue 1

Jan. 2020

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LI Yanchao, BI Mingshu, GAO Wei. Explosion pressure prediction considering the flame instabilities[J]. Explosion And Shock Waves, 2020, 40(1): 012101. doi: 10.11883/bzycj-2019-0004

Citation:

LI Yanchao, BI Mingshu, GAO Wei. Explosion pressure prediction considering the flame instabilities[J]. Explosion And Shock Waves, 2020, 40(1): 012101. doi: 10.11883/bzycj-2019-0004

LI Yanchao, BI Mingshu, GAO Wei. Explosion pressure prediction considering the flame instabilities[J]. Explosion And Shock Waves, 2020, 40(1): 012101. doi: 10.11883/bzycj-2019-0004

Citation:

LI Yanchao, BI Mingshu, GAO Wei. Explosion pressure prediction considering the flame instabilities[J]. Explosion And Shock Waves, 2020, 40(1): 012101. doi: 10.11883/bzycj-2019-0004

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Explosion pressure prediction considering the flame instabilities

doi: 10.11883/bzycj-2019-0004

School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 2019-01-04
Rev Recd Date: 2019-02-21

Available Online: 2020-01-25

Publish Date: 2020-01-01

Abstract

Abstract

This paper is aimed at revealing the couplings of flame instabilities and explosion pressure. By introducing flame wrinkling factor into the smooth flame model, the wrinkled flame model and turbulent flame model are developed to predict explosion pressure evolution. The effects of adiabatic and isothermal compression on explosion pressure prediction are also compared. The results demonstrate that the expanding flame tends to be more unstable under enhancing hydrodynamic instability and the cellular flame will be formed in the constant-volume stage. Since the smooth flame neglects the flame instabilities, the predicted explosion pressure is lower than experimental value. For the smooth flame model, the predicted pressure in the adiabatic condition is higher than that in the isothermal condition. The explosion pressure behavior could be overpredicted significantly using the turbulent flame model due to the fact that the turbulent flame model overestimates the flame wrinkling level. When the wrinkled flame model is considered, the explosion pressure behavior could be reproduced relatively satisfactorily for stoichiometric propane-air mixture and stoichiometric methane-air mixture in V=25.6 m³. When V≤1.25 m³, the experimental explosion pressure is lied within the predicted value using wrinkled flame model and adiabatic smooth flame model.
- flame instabilities,
- explosion pressure prediction,
- wrinkled flame model,
- turbulent flame model

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References(20)

References

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