Plasma-assisted deflagration to detonation transition in a microchannel with fast-frame imaging and hybrid fs/ps coherent anti-Stokes Raman scattering measurements

Vorenkamp, Madeline; Steinmetz, Scott A.; Chen, Timothy Y.; Mao, Xingqian; Starikovskiy, Andrey; Kliewer, Christopher; Ju, Yiguang

doi:10.1016/j.proci.2022.08.133

Plasma-assisted deflagration to detonation transition in a microchannel with fast-frame imaging and hybrid fs/ps coherent anti-Stokes Raman scattering measurements

Journal Article · Wed Jan 18 23:00:00 EST 2023 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2022.08.133· OSTI ID:1905554

Vorenkamp, Madeline ^[1]; ^[2]; Chen, Timothy Y. ^[2]; ^[3]; ^[3]; ^[2]; Ju, Yiguang ^[3]

Princeton Univ., NJ (United States); Princeton University
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Princeton Univ., NJ (United States)

Our study examines kinetic enhancement by nanosecond dielectric barrier discharge (ns-DBD) plasma on fuellean dimethyl ether (DME), oxygen (O₂), and argon (Ar) premixtures during deflagration to detonation transition (DDT) experiments in a microchannel. Non-equilibrium plasma produces active species and radicals and creates fast and slow heating of a mixture to promote ignition due to electronic and vibrational excitation. Experiments have been conducted to examine the influence of the plasma discharge on the premixture and on the resultant deflagration to detonation transition (DDT) onset time and distance through the use of high speed imaging and one-dimensional, two-beam, femtosecond/picosecond, coherent anti-Stokes Raman scattering (CARS). A highspeed camera is used to trace the time histories of flame front position and velocity and to identify the dynamics and onset of DDT. The results show that plasma discharge can nonlinearly affect the onset time and distance of DDT. It is shown that a small number of plasma discharge pulses prior to ignition result in reduced DDT onset time and distance by 60% and 40%, respectively, when compared to the results without pre-excitation by ns discharges. The results also show that an increase of plasma discharge pulses results in an extended DDT onset time and distance of 224% and 94%, respectively. Time history of the deflagration wave speed of DME and the analysis of ignition timescale under the choking condition of the deflagration front suggest low temperature ignition may play a role for DME near the isobaric choking condition of the burned gas and the DDT. Plasmainduced conversion of the reactive mixture was assessed via the O₂ to CO₂ ratio as measured through fs/ps CARS during the DBD discharges. The present experiments demonstrate the ability of non-equilibrium plasma to alter the chemistry of DME/O₂/Ar premixtures in order to control DDT for applications in advanced propulsion engines.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States); Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: SC0021217; SC0020233; NA0003525

OSTI ID:: 1905554

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Vol. 39; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
coherent anti-Stokes Raman scattering
deflagration to detonation transition
dimethyl ether
low temperature chemistry
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Plasma-assisted deflagration to detonation transition in a microchannel with fast-frame imaging and hybrid fs/ps coherent anti-Stokes Raman scattering measurements

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