Effect of the plasma location on the deflagration-to-detonation transition of a hydrogen–air flame enhanced by nanosecond repetitively pulsed discharges
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2022-09-18
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ArticleAuthors
Gray, Joshua A.T.
Lacoste, Deanna

KAUST Department
Clean Combustion Research CenterMechanical Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
BAS/1/1396-01-01Date
2020-09-18Online Publication Date
2020-09-18Print Publication Date
2020-09Embargo End Date
2022-09-18Submitted Date
2019-11-08Permanent link to this record
http://hdl.handle.net/10754/665386
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This work presents a method for using nanosecond repetitively pulsed (NRP) plasma discharges for accelerating a propagating flame such that the deflagration-to-detonation transition occurs. A strategy is developed for bringing the location of the plasma near the tube wall and, thus, reducing the presence of the electrodes in the combustion tube as well as presenting a configuration in which cooling of the electrodes is viable for practical applications. Time-of-flight measurements were used in combination with energy deposition measurements and high-speed OH*-chemiluminescence imagery to investigate the flame acceleration process. For stoichiometric hydrogen–air flames, successful transition to detonation was achieved by applying a burst of 110 pulses at 100 kHz, with energies as low as 10 mJ per pulse. This was also achieved when plasma discharges were applied in the vicinity of the wall. Two enhancement mechanisms for flame acceleration were identified. The essential role of shock–flame interaction was established as being the main mechanism for flame acceleration when the discharges are located near the wall. This work presents an effective alternative that allows for NRP discharges to be applied near the wall while successfully maintaining a promising success rate for detonation transition.Citation
Gray, J. A. T., & Lacoste, D. A. (2020). Effect of the plasma location on the deflagration-to-detonation transition of a hydrogen–air flame enhanced by nanosecond repetitively pulsed discharges. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.369Sponsors
This work is supported by the King Abdullah University of Science and Technology, through the baseline fund BAS/1/1396-01-01.Publisher
Elsevier BVAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S1540748920304958ae974a485f413a2113503eed53cd6c53
10.1016/j.proci.2020.06.369